Question

The addition of solid sodium carbonate to pure water causes.

• A. An increase in hydronium ion concentration
• B. An increase in alkalinity
• C. No change in acidity
• D. A decrease in hydroxide ion concentration

Answer 1

Answer: (B)

An increase in alkalinity

Answer 2

Adding $\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 }$ to water makes the solution basic and hence a pH increases from 7.