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A buffer solution is composed of 1.905 g of KH2PO4 and 5.181 g of Na2HPO4. (...

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Chemistry

A buffer solution is composed of 1.905 g of KH2PO4 and 5.181 gof Na2HPO4. ( Ka for dihydrogen phosphate ion is 6.2x10^-8 .)

a. What is the pH of the buffer solution?

pH =  

b. What mass of KH2PO4 must be added to decrease the buffersolution pH by 0.10 unit from the value calculated in part a?

Mass =

(Volume not given)

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