Lactic acid, HC3H5O3 , is a weak acid in aqueous solution, Ka = 1.4 × 10−4...

Question

Question

Lactic acid, HC3H5O3 , is a weak acid in aqueous solution, Ka = 1.4 × 10−4 .

Calculate Kb for the lactate ion, C3H5O –

Answer 1

Answer #1

The product of Ka and Kb gives us the dissociation constant for water which is 1 x 10-7.

⇒ Ka x Kb = Kw = 1 x 10-7

Here, Ka = 1.4 × 10−4

⇒ Kb = 1 x 10-7 / 1.4 × 10−4 = 0.7143 x 10-3 = 7.143 x 10-4

Answer 2

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