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Calculate the pH after 0.15 mole of NaOH is added to 1.05 L of a solution...

Calculate the pH after 0.15 mole of NaOH is added to 1.05 L of a solution that is 0.48 M HNO2 and 1.06 M LiNO2, and calculate the pH after 0.30 mole of HCl is added to 1.05 L of the same solution of HNO2 and LiNO2. ka of hno2 is 4.5 x 10^-4

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