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Which two of the following compounds would you mix to make abuffer of pH 7.45: H3PO4 (FM 98.00), NaH2PO4 (FM 119.98), Na2HPO4(FM 141.96), and Na3PO4 (FM 163.94)? (b) If you wanted to prepare1.00 L of buffer with a total phosphate concentration of 0.050 0 M,how many grams of each of the two selected compounds would you mixtogether?

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Related questions

You are asked to prepare a phosphate solution
1)which of the following compounds would you mix to make a bufferwith a pH of 8.0
2) (H3PO4, NaH2PO4, Na2HPO4, and Na3PO4). Hint phosphoric acid is atriprotic acid having pKa1 = 2.148, pKa2 = 7.199, and pKa3 =12.149.
3) If you want to prepare 500.0 mL of the buffer solution with atotal phosphate concentration of 0.200M, how many grams of each ofthe two selected compounds would you mix

Phosphoric acid is a triprotic acid with the following pKa values:

=2.148; =7.198; =12.375

You wish to prepare 1.000 L of a 0.0500 M phosphate buffer at pH 7.540. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark.

Question 1: What mass of each salt will you add to the mixture?

Mass NaH2PO4 () = ?

Mass Na2HPO4 () = ?

 

Question 2: What other combination of phosphoric acid and/or its salts could be mixed to prepare this buffer? (Check all that apply).

A. H3PO4 and NaH2PO4 ( and )

B. H3PO4 and Na2HPO4 ( and ) 

C. H3PO4 and Na3HPO4 ( and ) 

D. NaH2PO4 and NA3PO4 ( and ) 

E. Na2HPO4 and NA3PO4 ( and )

How many moles would you need to make the buffer?


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