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The acid dissociation constant of uric a...

The acid dissociation constant of uric acid is `K_(a)=4.0xx10^(-6)` M. The pH of a sample of urine is 6.0. What is the ratio of concentration of urate ion to uric acid in the urine?

A

`2.0`

B

`4.0`

C

`6.0`

D

`0.25`

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