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How many grams of NaH2PO4 and how many grams of Na2HPO4 are needed to prepare 2.0 L...

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Chemistry

How many grams ofNaH2PO4 and how many grams ofNa2HPO4 are needed to prepare 2.0 L of 1.50 M“phosphate buffer” with a pH of about 8.00.

You are given:

For salt form of aweak acid NaH2PO4 or weak acidH2PO4-, pKa =7.21 and Ka = 6.2 x 10-8

1 molNa2HPO4 = 142 gNa2HPO4

1 molNaH2PO4 = 120 gNaH2PO4

Select one:

a. Mass of NaH2PO4: 35.5 g and Mass ofNa2HPO4: 276.1 g

b. Mass of NaH2PO4: 70.6 g and Mass ofNa2HPO4: 392.9 g

c. Mass of NaH2PO4: 50.2 g and Mass ofNa2HPO4: 366.5 g

d. Mass of NaH2PO4: 37.9 g and Mass ofNa2HPO4: 312.8 g

e. Mass of NaH2PO4: 75.3 g and Mass ofNa2HPO4: 408.1 g

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