Concentration of acids and bases — task. Science CBSE Homework Assignments, Class 10.

1. How is the concentration of hydronium ions \(H_3O^+\) affected when a solution of an acid is diluted?

2. How is the concentration of hydroxide ions \(OH^–\) affected when excess base is dissolved in a solution of sodium hydroxide?

Excess base increases \(OH^-\) ion concentration.
As sodium hydroxide is a base, it does not affect the concentration of hydroxide ions \(OH^–\) .
When excess base is dissolved in sodium hydroxide solution, salt and water are formed.
Excess base decreases \(OH^-\) ion concentration.

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2. Concentration of acids and bases