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18 Nov 2019
Did you eat your apple today? If you did, you ingested some malic acid, as all apples contain it. Malic acid is a diprotic acid, HOOC-CH_2-CH(OH)-COOH, molar mass = 114 g/mol, pK_a1 = 3.40, and pK_a2 = 5.20 at 25 degree C. (You can abbreviate the acid as H_2A). You have 50.0 mL of a 0.100 M solution of this acid and you titrate it with 0.150 M NaOH. What is the pH of the solution at the following points? a) When you are halfway to the first equivalence point. b) When you are at the first equivalence point. c) When you are halfway between the first and the second equivalence point. d) When you are at the second equivalence point. e) When you have added 90.0 mL of the NaOH solution.
Did you eat your apple today? If you did, you ingested some malic acid, as all apples contain it. Malic acid is a diprotic acid, HOOC-CH_2-CH(OH)-COOH, molar mass = 114 g/mol, pK_a1 = 3.40, and pK_a2 = 5.20 at 25 degree C. (You can abbreviate the acid as H_2A). You have 50.0 mL of a 0.100 M solution of this acid and you titrate it with 0.150 M NaOH. What is the pH of the solution at the following points? a) When you are halfway to the first equivalence point. b) When you are at the first equivalence point. c) When you are halfway between the first and the second equivalence point. d) When you are at the second equivalence point. e) When you have added 90.0 mL of the NaOH solution.
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Elin HesselLv2
7 Jul 2019
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