Chapter 18.1, Problem 8SSC

Interpretation Introduction

Interpretation:

The reason for the compounds containing hydrogen to not be classified as Arrhenius acids in some cases needs to be explained.

Concept introduction:

According to Arrhenius, acid is a substance which gives hydrogen ion in aqueous solution.

Answer to Problem 8SSC

Arrhenius acids are those substances that have ionizable hydrogen. All the substances containing hydrogen can’t release $H^{+}$. Only those substances give $H^{+}$ in which hydrogen is attached to strong electronegative atom.

Explanation of Solution

Let’s take an example:

Acetic acid

Its formula is $C{H}_{3}COOH$

It has ionizable hydrogen which is attached to oxygen.

The hydrogen attached to carbon can’t release as $H^{+}$

Another example:

Ethane

Its formula is $C_2{H}_6$

It has six hydrogen but they are not ionizable. So ethane, irrespective of having hydrogen is not Arrhenius acid.

Conclusion

Thus all hydrogen atoms in the compounds are not ionizable.