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