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What volumes of 0.50 M HNO2 and 0.50 M NaNO2 must be mixed to prepare 1 liter of solution buffered at Ph of 3.55?

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It shows how to prepare the buffer solution with given pH.

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You know it would help if you would include the dissolution constants for these problems.

I obtained dissolution constant from the internet .

This problem requires the soultion of ...

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