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Calculate the final pH of a solution made by the addition of 10mL of a 5MNaOH solution to 500mL of a 0.4MHA originally at pH=5.0(pKa=5.0)

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Calculate the final pH of a solution made by the addition of 10mL of a 5MNaOH solution to 500mL of a 0.4MHA originally at pH=5.0(pKa=5.0) Neglect the volume change. Round to 3 significant figures! As a reminder, the concentration of the acid (here HA) is usually the amount initially used to make the solution, the concentration given is not the concentration in equilibrium

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