4. Lactic acid is found in milk and is present in human muscle tissue during exertion. It has also been found in the blood of a 16 year old boy who survived prolonged exposure to carbon monoxide poisoning. a. Calculate the pH of a solution containing 0.75 M lactic acid (K₁ = 1.4 x 104) and 0.25 M sodium lactate. b. Recalculate the pH after the addition of 0.05 ml of 0.1 M HCl. Compare this value with that where the same 0.05 ml of 0.1 M HCl is added to the equivalent amount of pH 7 water. You may assume no significant change in the volume since you are only adding 1 drop to each.

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Chapter15: Acid-base Equilibria
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Problem 61E: Lactic acid is a common by-product of cellular respiration and is often said to cause the burn...
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4. Lactic acid is found in milk and is present in human muscle tissue during exertion. It
has also been found in the blood of a 16 year old boy who survived prolonged
exposure to carbon monoxide poisoning.
a. Calculate the pH of a solution containing 0.75 M lactic acid (Ka = 1.4 x 10-4)
and 0.25 M sodium lactate.
b. Recalculate the pH after the addition of 0.05 ml of 0.1 M HCl. Compare this
value with that where the same 0.05 ml of 0.1 M HCl is added to the
equivalent amount of pH 7 water. You may assume no significant change in
the volume since you are only adding 1 drop to each.
Transcribed Image Text:4. Lactic acid is found in milk and is present in human muscle tissue during exertion. It has also been found in the blood of a 16 year old boy who survived prolonged exposure to carbon monoxide poisoning. a. Calculate the pH of a solution containing 0.75 M lactic acid (Ka = 1.4 x 10-4) and 0.25 M sodium lactate. b. Recalculate the pH after the addition of 0.05 ml of 0.1 M HCl. Compare this value with that where the same 0.05 ml of 0.1 M HCl is added to the equivalent amount of pH 7 water. You may assume no significant change in the volume since you are only adding 1 drop to each.
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