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Salt of Strong Acid and Strong Bases

In what volum...

Question

In what volume ratio NH4Cl and NH4OH having 1M concentration should be mixed to get a buffer solution of pH=9.26 (pK_b of NH4OH = 4.74?

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Solution

pOH = pK_b+ log ([salt]/ [base]) byHenderson-Hasselbalch Equation pOH = 14- pH = 14 - 9.26 = 4.74 hence 4.74 = 4.74 + log ([salt]/ [base]) therefore log ([salt]/ [base]) = 0 so [salt]/ [base] = 1 since they have concentrationas 1M so the volume ratio is 1:1.

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