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The Ka of phosphoric acid H3PO4 is 7.6xx...

The `K_a` of phosphoric acid `H_3PO_4` is `7.6xx10^(-3)` at `25^@C`
For the reaction , `H_3PO_4(aq)to H_2PO_4^(-)(aq)+H^(+)(aq)`
`DeltaH^@`=-14.2 kJ/mol.What is the `K_a` of `H_3PO_4` at `60^@C` ?

A

`4.2xx10^(-3)`

B

`6.8xx10^(-3)`

C

`8.5xx10^(-3)`

D

`1.8xx10^(-2)`

Text Solution

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The correct Answer is:
a
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