MM and IC of WA

MM and IC of WA - Introduction The purpose of this lab is to determine the molar mass and acid dissociation constant of acetic acid by titration

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Introduction The purpose of this lab is to determine the molar mass and acid dissociation constant of acetic acid by titration and pH measurement of solutions containing a known mass concentration of acetic acid. Also, we will be determining the molar mass and acid ionization constant of an unknown weak acid. A pH meter will be used to help determine pH levels. Acetic Acid will be used which has a molar mass of 60.05 g/mol and a pK a of 4.75. Relevant Formulas/Diagrams HA + H 2 O H 3 O + + A - CH 3 COOH + H 2 O H 3 O + + CH 3 COO - Procedure 1. Take 20 grams of acetic acid and find the pH. Transfer acid to flask and add 10 more ml giving a solution of 30ml in the flask. 2. Added 5 drops of 0.1% thymol blue indicator. Titrate solution using NaOH until a blue color is visible. Record volume of NaOH. 3. Repeated steps 1 and 2 4. Add 30 ml of acetic acid to flask and exactly half of the NaOH used in titrations of step two. 5. Determine pH using pH meter. 6. Repeated steps 4 and 5 7. Take unknown acid A and repeat steps one through six. 8. Using the Molar Mass and pK a from these numbers, the unknown acid was determined. Data Part 1: Concentration of NaOH = 0.097 M Trial 1 Trial 2 Measured pH of Acetic acid solution 3.01 3.01 Mass of acetic acid taken for titration 29.988 g 29.984 g Initial Vol. reading 0 mL 0 mL Final Vol. reading 12.6 mL 12.45 mL Net Vol. NaOH 12.6 mL 12.45 mL mMol NaOH used 1.22 mMol 1.208 mMol
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
in titration mMol Acetic Acid in sample 1.22 mMol 1.208 mMol Molarity of Acetic Acid solution 0.0407M 0.0403M Avg. calculated molar mass of Acetic Acid
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This lab report was uploaded on 04/10/2008 for the course CHEM 112 taught by Professor Jursich during the Spring '08 term at Ill. Chicago.

Page1 / 7

MM and IC of WA - Introduction The purpose of this lab is to determine the molar mass and acid dissociation constant of acetic acid by titration

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online