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Q.

The Ka of phosphoric acid,  H3PO4, is 7.6×103 at 25° C. For the reaction H3PO4(aq)H2PO4(aq)+H+(aq)

ΔH=14.2 kJ/mol What is the Ka of H3PO4 at 60° C?

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a

4.2×103

b

8.5×103

c

6.8×103

d

1.8×102

answer is A.

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Detailed Solution

lnka7.6×103=14.2×1038.31412981333 ka=4.2×103

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The Ka of phosphoric acid,  H3PO4, is 7.6×10−3 at 25° C. For the reaction H3PO4(aq)⟶H2PO4−(aq)+H+(aq)ΔH∘=−14.2 kJ/mol What is the Ka of H3PO4 at 60° C?