review the following titration graph for a triprotic acid and circle the buffer

Question

review the following titration graph for a triprotic acid and circle the buffer regions in the pH vs. volume graph

5. Review following titration graph for a triprotic acid and circle the buffer regions in the pH versus volume graph. Titration of 50.0mL of o 100M H,PO. with 0.100M NaoH pH 11.93 3 Equivalence point IPO pKa3 11.66 3" Halfequivalence point pH 9.46 2 Equivalence point HPO pKa2 R 7.21 2nd Half-equivalence point pH 4.67 1 Equivalence point H.Po.1 pKa1 2.12 Ka1 pH 1st Halt-equivalence point pH 1.62 volume of NaOH (mL)

Explanation / Answer

Buffer reginons are easy to identify

the are between the equivalence points

so

1st buffer region:

0 < Volume of Base < 50 mL

2nd buffer region

50 < Volume of base < 100 mL

3rd buffer region

100 < Volume of base < 150 mL

note that

at 0, 50, 100, 150 and V > 150, the region is NOT a buffer

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