   Chapter 16, Problem 45PS

Chapter
Section
Textbook Problem

A 0.015 M solution of hydrogen cyanate, HOCN, has a pH of 2.67. (a) What is the hydronium ion concentration in the solution? (b) What is the ionization constant, Ka, for the acid?

(a)

Interpretation Introduction

Interpretation: The hydronium ion concentration in the solution has to be calculated.

Concept introduction:

The pH value of hydrogen cyanate acid gives the concentration of hydrogen ion. The expression used for the calculation of hydrogen ion concentration is given as pH=log[H+].

Explanation

It is given that pH of hydrogen cyanate acid is 2.67

pH=log[H+]2.67=log[H+]

From

(b)

Interpretation Introduction

Interpretation: The ionization constant (Ka) of hydrogen cyanate acid has to be calculated.

Concept introduction:

The pH value of hydrogen cyanate acid gives the concentration of hydrogen ion. The expression used for the calculation of hydrogen ion concentration is given as pH=log[H+].

The acid dissociation constant or acid ionization constant of hydrogen cyanate acid can be determined by using the pH value of hydrogen cyanate acid (which gives the concentration of hydrogen ion) and from the given concentration of hydrogen cyanate acid.

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