The mass of NaCN needs to be determined. Concept introduction: The dissociation reaction of a weak acid is represented as follows: HA ⇄ H + + A − The expression for the acid dissociation constant will be as follows: K a = [ H + ] [ A − ] [ HA ] Here, [ H + ] is concentration of hydrogen ion, [ A − ] is concentration of conjugate base and [ HA ] is the concentration of weak acid. The molarity of solution is defined as number of moles of solute in 1 L of the solution: M = n V ( L ) From number of moles, mass can be calculated as follows: m = n × M Here, M is molar mass.

BuyFind

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373
BuyFind

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373

Solutions

Chapter 13, Problem 76QAP
Interpretation Introduction

Interpretation:

The mass of NaCN needs to be determined.

Concept introduction:

The dissociation reaction of a weak acid is represented as follows:

HAH++A

The expression for the acid dissociation constant will be as follows:

Ka=[H+][A][HA]

Here, [H+] is concentration of hydrogen ion, [A] is concentration of conjugate base and [HA] is the concentration of weak acid.

The molarity of solution is defined as number of moles of solute in 1 L of the solution:

M=nV(L)

From number of moles, mass can be calculated as follows:

m=n×M

Here, M is molar mass.

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