Question

What volumes of 0.53 M HNO2 and 0.46 M NaNO2 must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?
HNO2
Use the Henderson-Hasselbalch equation.
pH = pKa + log (base/acid)

You must look up Ka and substitute pKa.
228mL
452mL

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