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Aspartic Acid (C4H7NO4), One of the 20 Essential Amino Acids

Question 103

Multiple Choice

Aspartic acid (C4H7NO4) , one of the 20 essential amino acids, has two ionizable hydrogens.At 25°C, Ka1 = 1.38 * 10-4 and Ka2 = 1.51 * 10-10. What is the concentration of doubly ionized aspartate ions in a 0.125 M aqueous solution of aspartic acid?


A) 3.33 * 10-2 M
B) 4.16 * 10-3 M
C) 4.15 * 10-3 M
D) 1.51 * 10-10 M
E) 2.08 * 10-14 M

Correct Answer:

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