Question

An excess of dilute hydrochloric
acid is added to aqueous sodium
hydroxide. What is the pH of the
aqueous sodium hydroxide before
the acid is added and of the final
mixture?
O
Before: 3, final mixture : 13
O Before: 9, final mixture : 7
Before: 3, final mixture : 7
Before : 13, final mixture : 2
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Answer 1

Explanation:

Reaction between sodium hydroxide and nitric acid is a textbook example of acid base neutralisation. Sodium ions combine with nitrate ions to form sodium nitrite and hydrogen ions react with hydroxide ions to form water.if we add a strong acid or strong base to water, the pH will change dramatically. ... When this solid is added to water, the ions float apart leading to extra OH- ions in the water: NaOH → OH- + Na+. The resulting large concentration of OH- makes the solution more basic and leads to a dramatic increase in the pH.