# Which of the following is the weakest acid: HClO 4 , HCN, or HC 2 H 3 O 2 ? See Table 15.1 and Table 16.1.

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

### General Chemistry - Standalone boo...

11th Edition
Steven D. Gammon + 7 others
Publisher: Cengage Learning
ISBN: 9781305580343

#### Solutions

Chapter
Section
Chapter 16, Problem 16.2QP
Textbook Problem

## Which of the following is the weakest acid: HClO4, HCN, or HC2H3O2? See Table 15.1 and Table 16.1.

Expert Solution
Interpretation Introduction

Interpretation:

Using the table 15.1 and 16.1, the weakest acid among the given acids has to be given

Concept introduction:

A molecule or an ion that is capable of donating a proton or accepting an electron pair in a chemical reaction is known as an acid.

The strength of an acid can be studied from its pH value. Strong acids have low pH value whereas weak acids have high pH  value

The equilibrium constant for the dissociation reaction of a given acid is known as the acid dissociation constant and is denoted by the symbol, Ka .

The acidic strength increases with an increase in the value of Ka .

The strong and weak acid can be classified based on the following:

• When the Ka is large, it indicates strong acid
• When the Ka is small, it indicates weak acid

To Give: The weakest acid among the given acids.

### Explanation of Solution

The given acids are,

HClO4, HCN and HC2H3O2

The value of Ka for HC2H3O2 is 1.7×105 .

The value of Ka for HCN is 4.9×1010

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