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Calculate the PH of 1.00 L of a buffer that is 0.130 M HNO2 and 0.170...

Calculate the PH of 1.00 L of a buffer that is 0.130 M HNO2 and 0.170 M NaNO2. What is the PH of the same buffer after the addition of 1.00 mL of 12.0 M HCl. (pKa of HNO2 = 3.40).

Original Buffer:

After HCl is added:

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