CHEM 1212K Lecture Notes - Lecture 4: Sodium Acetate, Weak Base, Equivalence Point

61 views7 pages

indigowoodchuck995

4 Aug 2016

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Weak acid and base titration problems (questions and detailed solutions) Problem #1: consider the titration of a 24. 0-ml sample of 0. 105 m ch3cooh with 0. 130 m. Solution to part a: insert values into the ka expression for acetic acid. The ka for acetic acid is 1. 77 x 10-5. 1. 77 x 10-5 = [(x) (x)] / 0. 105 x = 1. 3633 x 10-3 m ph = 2. 865. Solution to part b: calculate moles of acid present: (0. 105 mol/l) (0. 0240 l) = 2. 52 x 10-3 moles, determine moles of base required to react equivalence point: There is a 1:1 molar ratio between acetic acid and sodium hydroxide. Therefore, 2. 52 x 10-3 moles of base required: calculate volume of base solution required: 2. 52 x 10-3 mol divided by 0. 130 mol/l = 0. 0194 l = 19. 4 ml. Solution to part c: calculate moles of acid and base in solution before reaction:

Related Questions

13. Consider the titration of a 20.00 mL sample of 0.105 M CH3COOH (acetic acid) with
0.125 M NaOH. The Ka for acetic acid is 1.8 Ã 10-5. Calculate the pH after 10.00 mL of
NaOH is added. The volume needed of base to reach the equivalence point/end point is
16.80 mL.
(A) pH = 4.74 (B) pH = 4.91 (C) pH = 4.57 (D) pH = 8.75

Consider the titration of a 20.0 mL sample of 0.105 M HC₂H₃O₂ with 0.125 NaOH. Determine:

a) the initial pH

b) the volume of added base required to reach the equivalence point

c) the pH at 5.0 mL of added base

d) the pH at one-half of the equivalence point

e) the pH at the equivalence point

f) the pH after adding 5.0ml of base beyond the equivalence point

burgundycrab751

1)Which of the following describes the process of titration ?

When an acid has exactly neutralized a base, or vice versa To cause a separation from solution or suspension

The technique of accurately measuring the volume of a solution required to react with another reagent

Any of various multiple oxides of titanium dioxide with other metallic oxides

In the titration of a weak acid with a strong base, the point at which the number of moles of acid equal the number of moles of base is called the ________.

titration point

equivalence point

half equivalence point

dissociation point

At the __________, the pH = pK_a.

Titration point

equivalence point

Half equivalence point

dissociation point

The equivalence point in the titration of 25.00 mL of acetic acid with 0.0987 M NaOH was determined to be 24.5 mL. What is the concentration of the acetic acid solution?

		0.0967 M
		96.7 M
		0.101 M

apricothyena380

CHEM 1212K Lecture Notes - Lecture 4: Sodium Acetate, Weak Base, Equivalence Point

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 1212K Lecture Notes - Lecture 9: Stoichiometry, Weak Base, Methylamine

BIOL101 Lecture Notes - Lecture 4: Conjugate Acid, Titration Curve, Ph

CHE-1102 Lecture Notes - Lecture 7: Titration Curve, Equivalence Point, Sodium Hydroxide

Related Questions