What is Titration: Definition and 278 Discussions

Titration (also known as titrimetry and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the titrant or titrator, is prepared as a standard solution of known concentration and volume. The titrant reacts with a solution of analyte (which may also be termed the titrand) to determine the analyte's concentration. The volume of titrant that reacted with the analyte is termed the titration volume.

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  1. R

    Needing help identifying a salt.

    So I recently did a titration lab with a monoprotic acid and sodium hydroxide. After using stochiometric ratios I found the molar mass to be around 175g/mol. It is possible I have a huge percentage error, but can anyone think of an acid that is monoprotic and is within the range of that molar...
  2. Z

    Solving Hydrate Formula w/ Titration: Na2CO3.xH20

    Homework Statement The formula of a hydrate may be determined by titarion. If 2.316g of a hydrate of sodium carbonate is required to completely neutralize 38.49 mL of 0.4198 mol/L HCl,find the formula of the hydrate. The products will be NaCl, H20, and CO3 Homework Equations n=cv m=mM The...
  3. S

    A redox titration with kmno4- and h2o2 help

    Homework Statement Calculate the average volume of permangate ion used. I'm given the average volume of kmno4 used. Homework Equations N=m/mm The Attempt at a Solution I tried to just average my kmno4 used, but I don't believe that's what my teacher is looking for. Help?[/B]
  4. Titan97

    Buffer Action and Titration: Does the Process Ever End?

    If H2A2+ is being titrated with NaOH, a buffer forms. The processes taking place are equilibrium between H2A2+ and HA+ ions, autoprotolysis of water and reaction of OH- ions with H2A2+ ions. As NaOH is added, the concentration of acid tends to decrease but because of the equilibrium ##H_2A^{2+}...
  5. Titan97

    Titration of amino acid with strong base

    Homework Statement An amino acid H2N-CHR-COOH e its as a dipolar ion: +H3N-CHR-COO-. In strongly acidic medium, it takes H+ to form conjugate acid +H3N-CHR-COOH 50ml solution of conjugate acid required 30ml of 0.1M NaOH to completely convert into dipolar ion. The pH of solution during titration...
  6. D

    Titration of Sulfurous Acid: Calculating pH with Ka Values

    Homework Statement A 0.551 L solution of 1.37 M sulfurous acid (Ka1 = 1.5e-2 and Ka2 = 1.0e-7) is titrated with 1.65 M NaOH. What will the pH of the solution be when 0.7549 L of the NaOH has been added? The answer is 7.27. Homework Equations -log(H+)=pH pH = pKa + log(salt/acid) The Attempt...
  7. U

    What is the Boehm Back Titration end point?

    Since I used a pH meter to determine the end point, I need to know if this technique is correct: For the basic solutions, I first titrated with HCl to a pH of 2 and then back titrated with NaOH to a pH of 7. Whereas if I am to use the same procedure for the acidic (HCl) solution must I titrate...
  8. Superposed_Cat

    Titration with NaOH and oxalic acid

    So I am doing a titration with NaOH and oxalic acid, prepared by adding 14g of the NaOH to 5dm^3 of H2O, the acid is (COOH)2.2H2O (2.5g in 0.25dm^3) . I seek to calculate the percentage purity of the NaOH. Now I'm confused, usually the percentage purity is based on products?? As in you have to...
  9. J

    Titration Lab Equipment Set Up

    Homework Statement Hi everyone. I'm teaching introductory chemistry this semester, but I don't have much of a chem background. We are about to start acid base titrations. Does the standard solution of known concentration go in the buret tube or the erlenmeyer flask? Does it matter? Homework...
  10. T

    What is the equivalence point on this graph?

    I am attempting to do a lab that requires the determination of an unknown diprotic acid using a titration curve. I have graphed my data but I am unsure what point to use as my eq. point. In my lab manual it says I may use the second or first eq. point but the second is often clearer. I am not...
  11. A

    Finding mass of acetyl salicylic acid in aspirin tablet

    Homework Statement 25 cm3 of 1M NaOH added to an aspirin tablet. 25cm3 of distilled water also added. Mixture heated for 10 mins. Hydrolysed solution and washings transferred to a 250 cm3 conical flask and made up to the mark (250cm3). 25 cm3 of the hydrolysed solution is titrated against 0.1M...
  12. patrickbotros

    Strong Acid-Strong Base Titration

    This is an example in my book. I have the answer for it, but I don't know why my answer was wrong. Here's the question: Lauren pours 40 mL of .1M NaOH into 100 mL of Megan's .1 M HCl. What is the pH? Here's what I did: R NaOH+HCl ⇔ NaCl + H2O I .004 , .01 ⇔ 0 0 C -.004 , -.004 ⇔ +.004 ...
  13. S

    Aqueous Equilibrium: Ka of an Unknown Acid via Titration

    Homework Statement We're given an unknown acid, and dissolve an unknown mass of the acid in an unknown amount of water. We then titrated the solution with an unknown molarity solution of NaOH. After titrating in 10.0 mL of NaOH, we measure a pH of 5. After 34.68 mL of NaOH, we realize we...
  14. Eclair_de_XII

    What would be the proper way to solve a titration problem?

    Homework Statement "A 4.36-g sample of an unknown alkali metal hydroxide is dissolved in 100.0 mL of water. An acid-base indicator is added and the resulting solution is titrated with 2.50 M HCl (aq) solution. The indicator changes colour signaling that the equivalence point has been reached...
  15. E

    Titration Apparatus: Acid/Base, Necessity of Known/Unknown

    Does it matter if I use acid or base in the burette or pipette? Is it necessary for the known or unknown to be in a specific thing? If yes, why?
  16. E

    Standarization of a Sodium Hyrdoxide Solution

    Homework Statement Hello, I missed a lab before the break because I was really sick and I need help. I was given the data from my partners for the titration lab and I don't understand how to calculate the amount of potassium hydrogen phthalate used in each trial, amount concentration of the...
  17. Q

    How to - regression of noisy titration curve

    I'd appreciate advice on the correct statistical method to analyse a dataset - Dataset is basically a titration curve consisting of [0.5, 1, 2, 3, 4, 5, 6] pg of starting material and 8 replicates in each 'pg bin'. In 'stage 1' of the process each bin is labeled separately, in 'stage 2' all...
  18. Teemo

    Amount of base needed to titrate to pH 10.00

    Homework Statement A 50.0 mL sample of a 1.00 M solution of a diprotic acid H2A (Ka1 = 1.0 × 10–6 and Ka2 = 1.0 × 10–10) is titrated with 2.00 M NaOH. What is the minimum volume of 2.00 M NaOH needed to reach a pH of 10.00? (A) 12.5 mL (B) 37.5 mL (C) 25.0 mL (D) 50.0 mL Homework Equations...
  19. N

    Examples and Calculations for Redox Titration

    Actually, what is redox titration? what are the steps of carrying out this typpe of titration? Is it just like the simple titration?? Can anyone kindly list out a few examples, i mean calculations about redox titration? I am thankful if anyone can help.
  20. K

    Redox titration and mass percent composition calculations.

    Homework Statement Hello everyone, I have completed a lab and I’m working on my report. I’m not sure if my work is correct but I would most definitely appreciate it if anyone could check it for me? I’m particularly having trouble finishing question #3. It’s worth a lot of my grade so I want...
  21. K

    Redox titration end point calculation -- Help please

    Homework Statement A student weighs by difference 0.1956 g of sodium oxalate into a 100 ml Volumetric flask and dilutes to the mark 10 ml of HCl and 90 ml of distilled water. Approximately how many ml's of 0.02 M KMnO4 would be required to reach the equivalence point of the titration...
  22. N

    How Do You Calculate the pH at Equivalence Points in Malonic Acid Titration?

    Malonic acid can ionise in two stages as it is a dibasic acid. The values of pKa1 and pKa2 of malonic acid are 2.85 and 5.70 respectively. Calculate the pH of the first and second equivalence points of the titration of 10cm^3 of malonic acid of concentration 0.1 M with sodium hydroxide of...
  23. Q

    Assumptions Built in to Solving Titration Equilibria?

    I'm trying to reach a more thorough understanding of what's going on when we calculate equilibrium concentrations and was wanting to understand more what assumptions we make in order to follow through with the calculations. Let me ask off of an example: Consider mixing equal amounts of NH3...
  24. N

    Determine amount of base to use for titration?

    Homework Statement How to find concentration of NaOH to titrate ASA with 30-40 mL I am doing a lab in which I need to use a base with a known concentration (a standard solution that I have to dilute to make a secondary standard) to react with an acid with an unknown concentration. I then have...
  25. Y

    H3PO4 Titration Problem: Determining Molar Concentration and Indicator Choice

    Hello Forum, Another problem again... Please bare with me. You are titrating an H3PO4 solution of acid. You titrate 20ml of that solution. You have used 15 ml of 0.500 M NaOH at the equivalence point. What is the molar concentration of the acid? Would bromophenol blue (pH 3.0-4.6) be...
  26. B

    How Do You Calculate pH in Titration of Dibasic Compounds?

    Homework Statement For the titration of 50.0 mL of a 0.100 M solution of a dibasic compound with 0.0500 M HCl, calculate the pH at 100mL (equivalence point) and at 145 mL. pka1=2.46 pka2=9.41 Homework Equations (1)pH=pka + log[BH+]/[BH2+] (2)[h+]=sqrt((K1K2F)+(K1Kw)/(K1+F)) The...
  27. A

    Titration of Weak Acid HCN: Calculating pH on Zumdahl's Chemistry (9th edition)

    Hello, on Zumdahl's Chemistry (9th edition), p.736: HCN, weak acid (Ka=6.2x10^-10), is dissolved in water. 50ml sample of 0.100M HCN is titrated with 0.100M NaOH. Calculate pH after 8.00 mL of 0.100M NaOH has been added. The steps are given. Then final answer is 8.49. That makes no sense to...
  28. A

    PH for this Weak Acid-Strong Base titration.

    \:Homework Statement What is the pH when 10 ml of 0.1 M NaOH is added to 25 ml of 0.1 M H_{}C_{2}H_{3}O_{2}? Homework Equations pH = -log[H_{3}O] The Attempt at a Solution The main thing confusing me about this type of problem is that my teacher taught me a way which is different from the...
  29. C

    Solve Amino Acid Titration for OH- to Raise pH to 9.7

    Homework Statement How many moles of OH– are required to raise the pH of 4.00 liters of 25 mM glycine, pH 1.90, to a final pH of 9.70? Assume that the addition of OH– does not change the volume of the solution. Homework Equations I know at some point I will need to use the...
  30. C

    KMnO4 Titration, why does it need to be in an acid?

    1. Homework Statement Fe(NH4)2(SO4)2*6H2O is mixed with H2SO4 and then titrated with KMnO4 until the equivalence point is reached. The question I am confused with is: What might have been the product(s) in the original solution if it had remained neutral? (if the solution was not acidified...
  31. A

    Titration Problem Chemistry pH

    Homework Statement Ok, so, I've been thinking about this for a while now. When I was doing titration back in high school, we had to put water (so that the solution would have a larger volume to work with) in the acid in which we were going to pour base from a buret. Now, my question is...
  32. S

    Titration Question & reverse titration?

    Homework Statement . A 50 mL acetate solution is titrated with a 0.2342 M HCl solution. The equivalence point occurs at 28.52 mL. Acetate is the conjugate base of acetic acid, for which Ka = 1.8 × 10-5 . b) Write down the titration reaction. c) Find the pH of the acetate solution at the...
  33. G

    Accounting for DI Water during Titration

    So I've gotten close to the correct answer for this problem, but I think I'm accounting for the DI water incorrectly: In titrating a blank, 0.11 mL of sodium hydroxide solution was required to titrate 50.00 mL of DI water. It required 17.56 mL of the same sodium hydroxide solution to titrate...
  34. J

    Why does [HA]=[A-] halfway thru a titration?

    I read somewhere that: "During the course of a titration, an acid in solution reacts with a base in solution, and when a strong acid or strong base is involved, this reaction always goes to completion..." HA(aq) + OH- (aq) → A- (aq) + H2O (1)" "At the equivalence point (which is the...
  35. B

    Triprotic Acid Titration Exact Calculation

    Homework Statement Calculate the analytical concentrations C2[KOH] and C2[H3PO4] in a solution where H3PO4 (originally of concentration 0.2 moldm-3 and volume 0.250 dm3) is titrated with KOH (originally of concentration 0.8 moldm-3, unknown volume used) until the pH reaches 7.8. Homework...
  36. A

    Solving Titration Problems: NaOH + Oxalic Acid

    I am doing titration of NaOH with oxalic acid at school and none of my results are close together at all. I got 1. 26.6 mL 2. 27 mL (although I want to discount this since I wasn't very careful with this) 3. 25.5 mL 4. 26 mL 5. 25.3 mL (For this titration I realized that there was some...
  37. A

    Need opinion on titration question

    This is what we have to do for our chem prac 1) Dissolve 2g of NaOH in 500 mL of water to make a solution 2) Since NaOH cannot be used directly as standard solution titrate it with a standard oxalic acid solution 3) Calculate concentration of NaOH 4) Now use this standardised solution of...
  38. Y

    Titration Chemistry Problem: How to Calculate Volume and pH at Equivalence Point

    Sorry to disturb. I'm really bad at chemistry and i was hopping i could find some help... My major doubt is about Titration for now and how to find what is asked even if i got the data needed. Homework Statement 25.0 cm3 of 1.00 x 10-1 mol dm3 hypobromous acid ( HBrO ) solution is...
  39. A

    Troubleshooting Titration: Hair & Water Effects

    Okay this maybe a silly question but I had to ask. In school we are making standard solution to perform a titration. To do this we measured in grams a sample of oxalic acid and mixed in water and then made the solution up to mark in a volumetric flask. When I did my titration; as I was...
  40. F

    Discussion Boehm titration results - Procedure and Calculation?

    I'm posting this here because I did not get much help from the Chemistry section. Please read further. Anyone familiar with the Boehm titration procedure and calculations? I've done the titrations based on what I was able to gather from literature and the calculations but the results don't...
  41. F

    Calculating Surface Oxygen Groups in Boehm Titration Procedure?

    There is too much difference in literature regarding the procedure for Boehm Titration and my efforts to find the original article which describes the method developed by Boehm himself has not been fruitful. Boehm titration is an acid-base titration method which is used to determine the...
  42. C

    Titration of a weak base w/ a strong acid

    Homework Statement Determine the pH at the equivalence point after 20.00mL of a 3.75 M NaF(aq) solution is titrated with 3.25 M HI(aq) Homework Equations ##k_a = \frac{[A^-][H^+]}{[HA]}## The Attempt at a Solution The first thing I noted was that NaF ##\rightarrow## Na+(aq) +...
  43. M

    Determination of Ethanol Content Using Titration

    Hi everyone! So, something sort of weird happened in analytical lab and I was wanting some guidance. I was trying to determine the ethanol concentration in a 4 Loko, a red wine, and a beer through acid/base titration. I pipetted a little bit of a diluted alcohol sample into a small beaker and...
  44. M

    Error by a factor of 10 in peroxide/permanganate titration

    Hi all, Trying to get this titration working correctly and for the life of me, I can't figure out where my error is. This is what I have: Burette contains 0.01M KMnO4 (I'm positive that my error does not come from preparing this - 0.4g in 250ml of water, with a molar mass of 158g/mol...
  45. B

    Thiosulfate Standardization via Iodate Titration

    Homework Statement How do I figure out the concentration of Thiosulfate in mol/L or g/L if I am only given the following: 0.00167M Iodate (IO3-) 10g of 0.00167M Iodate (IO3-) in Solution 0.71266g of Thiosulfate necessary to titrate IO3- MW = 174.9027 g/mol Thiosulfate MW = 248.18 g/molHomework...
  46. E

    Potentiometric titration by ''mathematica''

    Homework Statement at first, please look at this link http://upload.wikimedia.org/wikipedia/commons/0/0a/Potentiometrics_meas_1st_2nd_deriv-with-legend.JPG as you know, potentiometric titration's data makes this graph. and first derivative, 2nd derivative etc.. I haven't tried...
  47. H

    Chemistry: Titration of of a base to solve for the mass of an unknown acid.

    A student titrated a .4630g of unknown monoprotic acid with .1060M NaOH. The equivalance point volume is 28.70mL. a) Calculate the number of moles of NaOH used. Im pretty sure I got this one I did .1060 M X .02870L to equal 3.04E-3 mol b)how many equivalents of unknown acid were titrated...
  48. P

    AP CHem, finding concentration of H2O2 by titration

    Homework Statement I need to find the concentration of the H2O2 that we usedHomework Equations 2KMnO4 + 5H2O2 + 3H2SO4 → 2MnSO4 + 5O2 + 8 H2O + K2SO4 (not sure if correct) we got an average of 34.5 ml of titrant, for solution we were adding the titrant to being 5ml of Hydrogen peroxide, and...
  49. K

    Calculate mw of unknown using titration

    Homework Statement Calculate the molecular weight of unknown acid by titrating with 2N H2PO4 and 2N NaOH Homework Equations ph = pka + log[a-]/[ha] The Attempt at a Solution So i graphed titration with both acid and base with equivalents used vs ph, how would i use the number of...
  50. R

    Redox Titration Question - Answer Check & Questions

    Good day! I would just like to confirm a couple things in regards to my solution for this problem. Problem: A sample of hydrated ethanedioic acid crystals (formula H2C2O4 . 2H2O) of mass 0.2145g was dissolved in water and the solution was used to standardise some potassium permanganate...
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