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Social Science105. Phosphoric acid is a triprotic acid, ionizing in the following sequential steps:8К,Н.РО, + H.0 н,РО, + Н,О-Ка,H POHOsHPOHOКл,HPO H2OS PO HOWhat is the K expression for the base, sodium phosphate?а. Кd. КхК,,крК, хК, хК.1b.К.,е.Kс.К,
Phorphoric acid is a triprotic acid, ionizing in the following sequential steps: (see attached image)
What is the the Kb expression for the base, sodium phosphate?
a. Ka3
b. 1/Ka3
c. KW/Ka3
d. KwxKa3
e. Kw3/Ka1xKa2xKa3
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105. Phosphoric acid is a triprotic acid, ionizing in the following sequential steps: 8 К, Н.РО, + H.0 н,РО, + Н,О- Ка, H POHOsHPOHO Кл, HPO H2OS PO HO What is the K expression for the base, sodium phosphate? а. К d. КхК,, кр К, хК, хК. 1 b. К., е. K с. К,
Expert Answer
The equilibrium constant for water, Kw is given as:
![Н.О (1) + H-О () — Н:0* + ОН
Kw - [Нз0"] [ОН ]](https://prod-qna-question-images.s3.amazonaws.com/qna-images/answer/b0db791d-c638-465b-9966-bc28c49b67bc/4871da3d-7dba-4afa-a868-a68cc0e847e0/n1sgvrn.png)
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Н.О (1) + H-О () — Н:0* + ОН Kw - [Нз0"] [ОН ]
The given equations for triprotic phosphoric acid are:
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H3PO4H2OH2PO4 +H3O Kal ..(1) Н.РО4 + H20 НРО42- + Hз0+ Ka2 .(2) НРО42- + Н20+ РO43- + НзО* Ka3 .....(3)
The dissociation of sodium phosphate can be written as:
Na3PO4 ↔ 3 Na+ + PO43-
Here, the conjugate base is PO43-
The equation for the dissociation of the base in water PO43- can be written as:
PO43- + H2O (l) ↔ HPO42- + ...
![РО+ H.О ()
НРО2- + ОН
[(НРОД)2-] [он-]
К -
[(РОд)3-]](https://prod-qna-question-images.s3.amazonaws.com/qna-images/answer/b0db791d-c638-465b-9966-bc28c49b67bc/4871da3d-7dba-4afa-a868-a68cc0e847e0/w9bo07b.png)
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РО+ H.О () НРО2- + ОН [(НРОД)2-] [он-] К - [(РОд)3-]
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