What is the pH of a solution of 0.25M K3PO4, potassium phosphate? Given Ka1 = 7.5*10^-3 Ka2 = 6.2*10^-8 Ka3 = 4.2*10^-13 I know there is another post here with the same question but nobody explained anything. Where does the K3 go? Why does everyone I see solve this just ignore it and go to H3PO4? Please type answer note write by hend

Chemistry
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ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Steven S. Zumdahl
Chapter14: Acids And Bases
Section: Chapter Questions
Problem 4RQ: How is acid strength related to the value of Ka? What is the difference between strong acids and...
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What is the pH of a solution of 0.25M K3PO4, potassium phosphate? Given

Ka1 = 7.5*10^-3
Ka2 = 6.2*10^-8
Ka3 = 4.2*10^-13

I know there is another post here with the same question but nobody explained anything. Where does the K3 go? Why does everyone I see solve this just ignore it and go to H3PO4?  

 

Please type answer note write by hend  

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