A 0.050 M solution of pyruvic acid, an intermediate in metabolism, has a pH of 1
ID: 538518 • Letter: A
Question
A 0.050 M solution of pyruvic acid, an intermediate in metabolism, has a pH of 1.91. Calculate K for pyruvic acid, a weak monoprotic acid. Use significant figures and “E” for scientific notation.The pH of a 0.50 M solution of ethylamine CHCHNH is 12.17. Calculate the K of ethylamine. Use significant figures and “E” for scientific notation.
A 0.050 M solution of pyruvic acid, an intermediate in metabolism, has a pH of 1.91. Calculate K for pyruvic acid, a weak monoprotic acid. Use significant figures and “E” for scientific notation.
The pH of a 0.50 M solution of ethylamine CHCHNH is 12.17. Calculate the K of ethylamine. Use significant figures and “E” for scientific notation.
The pH of a 0.50 M solution of ethylamine CHCHNH is 12.17. Calculate the K of ethylamine. Use significant figures and “E” for scientific notation.
Explanation / Answer
pH = 1/2 (pKa -logC)
concentration = 0.05 M
1.91 = 1/2(pKa - log(0.05))
pKa = 2.51
Ka = 10^-2.51
= 3.09*10^-3
pOH = 1/2(pKb-log(c))
pH + pOH = 14
pOH = 14 - 12.17 = 1.83
1.83 =1/2(pKb - log(0.5))
pKb = 3.36
Kb = 10^-3.36
= 4.36*10^-4
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