Why the pH value does not change?

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When copper oxide (CuO) is introduced to water, it remains insoluble and does not dissolve, which means it does not contribute to the concentration of hydronium ions (H3O+) in the solution. As a result, the pH of the water remains unchanged. The discussion highlights that while pH can be affected by redox reactions facilitated by metals, in this case, no such reactions occur since CuO does not release ions into the water. Thus, the stability of the pH value is maintained due to the absence of any changes in H3O+ concentration.
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When the CuO (copper oxide) is put into water, it does not dissolve in water. But why the pH value of the water does not change?
 
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pH of a solution is measured by H3O+ concentration , therefore , the value of the water won't change cause no H3O+ were added or taken .
 
pH might change due to a redox reaction, catalyzed by the metal, but you say it doesn't dissolve, so no reaction is taking place (with dissolve I mean ions coming free).
 

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