Calcium lactate is a salt of a weak organic acid and represented as Ca ( L a c ) 2 . A saturated solution of Ca ( L a c ) 2 contains 0.13 mol of this salt in 0.50 litre solution. The pOH of this solution is 5.60. Assuming a complete dissociation of the salt.

Question

Calcium lactate is a salt of a weak organic acid and represented as Ca ( L a c ) 2 . A saturated solution of Ca ( L a c ) 2 contains 0.13 mol of this salt in 0.50 litre solution. The pOH of this solution is 5.60. Assuming a complete dissociation of the salt., 824 × 1 0 - 4, 8.24 × 1 0 - 4, 82.4 × 1 0 - 4, 8.24 × 1 0 4

MARKS App · Accepted Answer

Molarity of salt = 0.13 0.5 = 0.26 M C a ( L a c ) 2 0.26 0 ⇌ C a 2 + + 2 L a c - 0 2 × 0.26 p H = 1 2 p K w + 1 2 p K a + 1 2 l o g C So p H = 1 2 × 14 + 1 2 p K a + 1 2 × l o g 0.52 p K a = 2 ( 8.4 - 7 + 0.142 ) = 3.084 K a = 8.24 × 1 0 - 4

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