Suppose you dissolve 1.5 g of KH2PO4 in 1L of water and then adjust the pH...
Suppose you dissolve 1.5 g of KH2PO4 in 1L of water and then adjust the pH of the solution to 6.8. What are the concentrations of the species listed below?
A) H3PO4
B) H2PO4-
C)HPO4-2
D)PO4-3
Homework Answers
The answer is HPO42-.
where the pKa value of this ion is almost near to the 6.5 to 7
By calculating the Normality of the given compound KH2PO4 in 1L we get ~11.023N on calculating the pH value we get the pH value of ~9.5.
Where the given compound can be dissociated K+ and H2PO4- (dihyrogen phosphate )
In the aqueous solution by adding water the dihydrogen phosphate ion further dissociated into H+ and HPO42- (hydrogen phosphate) which have a pH concentration of 6.5 to 7
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