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Explain at the molecular level why the pH increases as NaOH is added to HNO3 (titration)

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The pH increases because the concentration of hydrogen ions increases.

WisdoM

the chemical reaction between NaOH and HNO3 is 
NaOH + HNO3 ⇒NaNO3+H2O..
there is an increase in Ph because NaOH gives OH which increase the pH in product formed..
HNO3 is acidic , but NaNO3 is neutral here because Naoh increases the ph and makes it neutral .. N03 is the conjugate base of HNO3..

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