Titration Definition and 278 Threads

Homework Statement To a 25ml H2O2 solution, excess acidified solution of potassium iodide is added. The libereated iodine required 20ml of 0.3N sodium thiosulphate solution. Calculate the volume strength of H2O2. Homework Equations Normality = n-factor × Molarity Volume strength = Molarity ×...

Homework Statement Hi everyone. 1) If I perform a titration with a buret not rinsed in the titrant, then how will the pH of the endpoint be affected? 2) Also, if the volumetric pipet used to measure the analyte is not rinsed with the analyte, how will that affect the pH of the endpoint...

Homework Statement Methyl red has the following structure [not listed here on this post] Ka = 5.0 * 10 E -5 It undergoes a color change from red to yellow as a solution gets more basic. Calculate an approximate pH range for which the methyl red is useful. What is the color change and the...

Homework Statement A redox titration is carried out by adding Purple KMnO4 solution from a burette to a solution of H2O2 in a flask. Which of the following would occur in the flask before the equivalence point is reached? The answer is: The solution is colorless and O2 is formed. The other...

Homework Statement A sample of saturated Ca(OH)2 solution in water is collected in flask #1, filtered into flask #2, then 25.00mL samples were transferred into flasks #3, #4, #5. Which flasks had to be dry and which could be wet? Also, flask #2 was stoppered. Why? Homework EquationsThe...

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...

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...

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]

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+}...

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...

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...

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...

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...

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...

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...

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...

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 ...

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...

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...

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?

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...

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...

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...

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.

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...

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...

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...

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...

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...

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...

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...

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...

\: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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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) +...

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...

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...

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...