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Calcium lactate is a salt of weak organi...

Calcium lactate is a salt of weak organic acid and strong base represented as `Ca(LaC)_(2).` A saturated solution of `Ca(LaC)_(2)` contains 0.6 mole in 2 litre solution. pOH of solution is 5.60. If `90%` dissociation of the salt takes place then what is `pK_(a)` of lactic acid?

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