Why the pH value does not change?

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SUMMARY

The pH value of water remains unchanged when copper oxide (CuO) is added because CuO does not dissolve in water, thus not contributing any H3O+ ions to the solution. The pH is determined by the concentration of H3O+, and since no ions are released from CuO, the pH remains stable. Although redox reactions can alter pH, in this case, no such reactions occur due to the insolubility of CuO in water.

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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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