Predict the change in pH when sodium lactate is added to a solution of lactic acid....

Predict the change in pH when sodium lactate is added to a solution of lactic acid.

Increase

Decrease

Stay the same

Expert Solution

Answer :

pH will increase.

Explanation :

Lactic acid <==> H+ + Lactate ion

Equilibrium is maintained in only lactic acid solution.

When sodium lactate is added into the Solution, backward reaction proceed according to Le-chatelier's principle because if we increase concentration of any of product ( here lactate) than equilibrium will shift in that direction where its effect can be reduced which is in backward direction. So, concentration of H+ will decrease and pH will increase.

pH = - log (H+)

Or

Lactate will combine with H+ already dissociated in lactic acid solution and form lactic acid . Due to which concentration of H+ will decrease in the solution which means Solution become less acidic . So, pH will increase .

High pH means basic Solution and low pH means acidic solution.

queen_honey_blossom answered 3 years ago

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