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You have 1 M solutions of H3PO4, NaH2PO4, Na2HPO4, Na3PO4 (no NaOH). => Using only two of these...

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Question

Chemistry

You have 1 M solutions of H3PO4,NaH2PO4, Na2HPO4,Na3PO4 (no NaOH).

=> Using only two of these solutions, how would youprepare 150 mL of 1 M phosphate buffer at pH 3.0?

A)

131.4 mL of NaH2PO4 + 18.6 mLH3PO4

B)

50 mL Na2HPO4 + 100 mLNa3PO4

C)

75 mL Na2HPO4 + 75 mLNa3PO4

D)

18.6 mL of NaH2PO4 + 131.4 mLH3PO4

Answer & Explanation Solved by verified expert
3.8 Ratings (460 Votes)
pH of buffer 30 Volume of buffer 150 mL 0150 L pKa of H3PO4 215 Using HendersonHasselbalch equation pH pKa log baseacid 30 215 log NaH2PO4 H3PO4 085 log NaH2PO4 H3PO4    See Answer
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