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A buffer solution based upon sulfurous acid was created by treating 1L of 1M sulfurous acid...

A buffer solution based upon sulfurous acid was created by treating 1L of 1M sulfurous acid with NaOH until a pH of 1.347 was achieved (assuming no volume change). To this buffer 1.170 moles of NaOH were added (assume no volume change). What is the final pH of this solution? Assume 5% assumption is valid.

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