For 260.0 mL of a buffer solution that is 0.205 M in HCHO2 and 0.310 M in KCHO2, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. Express your answers using two decimal places separated by a comma.

For 260.0 mL of a buffer solution that is 0.295 M in CH3CH2NH2 and 0.275 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. Express your answers using two decimal places separated by a comma.

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For 260.0 mL of a buffer solution that is 0.205 M in HCHO2 and 0.310 M in KCHO2, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. Express your answers using two decimal places separated by a comma.

For 260.0 mL of a buffer solution that is 0.295 M in CH3CH2NH2 and 0.275 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.010 mol of NaOH. Express your answers using two decimal places separated by a comma.

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