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. S

    Chemistry - Titration, Redox, Combining Equations

    The attachment shows reactions involved in a titration experiment. In the first equation, iodate reacts with iodide in acidic solution to produce iodine. In the second equation, the iodine is titrated with thiosulfate. I know the volume and molar concentration of iodate as well as the volume...
  2. F

    Titration - Calculating the endpoint

    Hello, I have titrated 25 ml of NaOH with 25 ml of HCl. Both are 0.1M. I need to calculate the expected endpoint for the titration of the strong base with the strong acid. I know that: 0.025 L x 0.1M = 2.5 x 10^-3 moles of NaOH and HCl each. I know that I need the same volume of both to...
  3. Apost8

    Titration of NaOH and C2H204 using phenolphthalein

    The other day, we performed a simple titration of NaOH and C2H204 using phenolphthalein as our pH indicator. I performed 3 trials and I calculated % error from .5 to 2%. What is the proper way of determining the end-point? How pink should the titrant be before you stop adding? This method...
  4. H

    How Is a Blank Used in Mohr Titration?

    Hi... I was wondering exactly how a blank is used for a titration. Is the purpose to simply remove the extra "noise" in the results? If so, I guess I would subtract this blank from the calculated volumes of AgNO3 used... right? Please help! Thanks, -heather
  5. N

    Acid Base Titration: Finding pH

    Hi. I am having trouble with acid-base titration excercises. 0.02 L butanoic acid @ 0.1 M is titrated with 0.01 L NaOH solution @ 0.1 M. The Ka of butanoic acid is 1.54X10^-5. Find the pH. The answer is 4.81. I know how to find the pH when no NaOH is added, but I really don't see how the...
  6. W

    Still am having trouble with titration

    Thank you for responding, but I am not sure how to solve this yet. I am sorry. Could you show me a more of the work needed? I teach high school chemistry, and it is beginning to look like the question is beyond the scope of the course, but now I am curious how to solve it. Anyways, thanks for...
  7. D

    Help Needed: Titration Curves - pH & H+ Calculation

    Titration Curves - Help needed I really need some help in this, I don't understand how to make a titration curve. I have 50ml of a 0.1 M solution of formic acid with a 0.1 M solution of NaOH. I know that the pKa of the formic acid is 3.74 but i don't know how to get the pH or H+. I've hit a...
  8. W

    Calculating Buffer Solution Volumes for pH 4.6 using Titration Virtual Lab

    I really need help. I am a teacher and can't seem to figure out this problem, although I know I did it once before. I have used a virtual lab and know that you need 71 ml of acetic acid and 29 ml of NaOH, but don't know how to calculate it. Can someone tell me? I know the concentration of H in...
  9. D

    Acid base titration problem. Need Help

    How many moles of H3O+ must be added to one liter of a solution to adjust the pH from 7.17 to 5.85? Correct answer 1.34E-6 (1.34 * 10-6) The correct answer is given, however I would like to know how to do this problem.
  10. P

    Problem with titration problem Please HELP

    Problem with titration problem Please HELP! Hi, In our AS level chemistry coursework we have performed the following experiment. We took 2.00g of MHCO3 where M stands for a group 1 metal. We put it in 250ml volumetric flask and we produced our standard solution. Then in a conical...
  11. A

    Proving inflection points - Titration

    This is not a homework question, but my prof came up with the concept of determining the inflection point on a titration graph with 2 pKas. He simply told us that it was the average of the 2 pKa values. However, he also just mentioned that it can also be proven through calculations, but he never...
  12. A

    Trouble with titration calculations

    i'm having trouble with titration calculations. How would you attempt this problem? 50mL of a 0.50M H2SO4 is added to 100mL of 0.25M H2SO4. Calculate the final concentration of the acid. Also: how would you show that aluminum sulphate would show acidic properties using balanced...
  13. C

    Why Choose Phenolphthalein Over Bromothymol Blue for Equivalence Point at pH 7?

    Why is it better to use phenolphthalein than bromothymol blue to determine the equivalence point which is equal to 7? bromothymol blue: 6.0 - 7.6 yellow @ blue phenolphthalein: 8.3 - 10.0 colorless @ pink :grumpy:
  14. P

    Ph meter or acid/base titration?

    Which would you use advising, a ph meter or acid/base titration? advantages/disadvantages to both?
  15. D

    Titration Help: Standardize HCl Using Oxalic Acid & CaCOH Solution

    Question: Prepare a standard solution of oxalic acid (approx. 0.05M). Use it to find the conc of the given solution of CaCOH. Use this to standardize the given solution of HCl. So basically I am suppose to do this as an inclass lab. I will be given a 250 ml volumetric flask where i will...
  16. D

    Thinking hard about errors in titration

    hi guys assistance in this area would be great just see what i have written and comment on them please thanks! all. im thinking about the errors in titration from doing a typical acid-base titration to talk about in my experiment and these are the errors i came up with. First of all my...
  17. C

    Acid-Base Titration: Solve Question w/ Phenolphthalein & Methyl Orange

    Hello! Here is a acid-base titration question which I am a bit confused at, please help me with it. If 25cm^3 solution containing 0.5M sodium carbonate and 0.5M sodium hydrogencarbonate is titrated with 1M HCl using phenolphthalein indicator. Upon the addition of 12.5cm^3 HCl, the...
  18. E

    How Do I Calculate the Molarity of Potassium Iodate in a Redox Titration?

    totally stuck! hey guys and girls, I'm having some serious problems with this redox reaction titration thing i just did! Basically i titrated a sodium thiosulphate solution with potasium iodate(v), sulphuric acid, potassium iodide and some starch. I've worked out the molarity of my sodium...
  19. R

    Titration of Hydrazoic Acid: 1986 AP Exam Question and Solution

    This question appeared on 1986 AP Exam. 1) In water, hydrazoic acid, HN3, is a weak acid that has an equilibrium constant, Ka, equal to 2.8E-5 at 25 degree C. A .300L sample of a .050molar solution of the acid is prepared. Now.. there is a part d) to this question... d) To the remaining...
  20. K

    Why Does the Pink Color in a Titration Fade Over Time?

    How to answer the question: why the pink colour (from 2-3 phenolphthalein indicator) obtained at the end point of the titration in this experiment gradually disappears over time? :confused: Is it because of that the water will reverse back to the form of H+ and OH-?
  21. P

    Titration Calculation question.

    Here's the question: ----------------- 95.0 mL of 2.1 M H_2SO_4 _(aq) was needed to neutralize 52.0 mL of NaOH _(aq) . What was the Molarity concentration of the sodium hydroxide solution? ------------------ Here's what I did: Reaction: H_2SO_4 + 2 NaOH -> Na_2SO_4 + 2H_2O...
  22. N

    How to Calculate pH in a Titration of Citric Acid with NaOH?

    50.00 mL of 0.1000 M citric acid (Ka = 7.41 x 10^-4). titrated 50.00 mL NaOH added. Calculate pH. I have equal moles of Acid and equal moles of Base. But, I am titrating a strong base into a weak acid. So, instead of my pH being 7, I assume it should be just above 7. But, I am not...
  23. M

    A) Yes, this is the balanced equation for the reaction between Sn2+ and Tl3+.

    consider the titration of 50 mL on 0.10M Sn2+ with 0.10M Tl3+ A) Wite the equation for the reaction that occurs between Sn2+ and Tl3+ Sn^2^++Tl^3^+\longrightarrow\ Sn^4^++Tl^+ Correct?
  24. T

    Calculate Molarities of HCl & NaOH Solutions: Titration Ques

    A 0.4793g sample of primary standard grade Na2CO3 was treated with 40.00mL of dilute HCl. The solution was boiled to remove CO2 and then excess HCl was back-titrated with 8.70mL of NaOH. In a separate experiment, it was established that 27.43mL of the HCl neutralized the hydroxide in a 25.00mL...
  25. M

    What is the weight percent of NH3 in the window cleaner?

    [SOLVED] titration need help getting started A 10.231g sample of window cleaner containing ammonia was diluted with 39.466g of water. Then 4.676g of solution was titrated with 14.22mL of 0.1063 M HCl to reach a bromocresol green endpoint. Find the weight percent of NH3 (FW 17.031) in the...
  26. D

    Help need titration curve for Arginine

    I have a question When you do a titration curve for Arginine and you start it off in the acid exteme (low pH) does it gain anymore Hydrogens other than the one that always bonds to the COO- group? (so does it gain more than a +2 charge) To rephrase, do any of the other two Nitrogens...
  27. M

    How Does Excess HCl Affect pH in Methyl Ammonia Titration?

    consider the titration of 50.0mL of 0.10 M methyl ammonia with 0.10 M HCl. Calculate the pH after 15mL of titrant= 11.05 25mL of titrant= 10.68 50mL of titrant= 8.98 60mL of titrant= ? At 60 mL there is an excess of 1 mmol of HCl. At this point do I say that the pH is 1 (-log of 0.10)...
  28. T

    Calculating PPM Iron: Iron Titration

    Please Help! I have no idea where to start with this one! A 100.0mL sample of water was treated to convert any iron present to ferrous ion. Addition of 25mL of 0.002107M potassium dichromate converted the iron to ferric ion and the dichromate to Cr3+. Excess dichromate was then back...
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