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If nitric acid (HNO3) is added to water, it decreases the concentration of hydroxide ions in solution. This is because nitric acid semi-strongly dissociates in water, following this chemical reaction:

HNO3(aq) + H2O(l)-->NO3-(aq) + H3O+(aq)

The hydronium ions that are created in this reaction then react quickly with the hydroxide ions in the water, as shown in this chemical equation:

H3O+(aq) +OH-(aq) --> 2H2O(l)

This results in fewer hydroxide ions existing in solution.

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