Please help! I cant figure it out. LAST QUESTION: How many grams of base are nee

Question

Please help! I cant figure it out.

LAST QUESTION:

How many grams of base are needed for the buffer?

You are instructed to create 800. mL of a 0.60 M phosphate buffer with a pH of 7.4. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) Which of the available chemicals will you use for the acid component of your buffer? Which of the available chemicals will you use for the base component of your buffer? What is the molarity needed for the acid component of the buffer? What is the molarity needed for the base component of the buffer? How many moles of acid are needed for the buffer? How many moles of base are needed for the buffer? How many grams of acid are needed for the buffer?

Explanation / Answer

1)Na2HPO4

2)NaH2PO4

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