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

question 112

Multiple Choice

Aspartic acid (C₄H₇NO₄) , one of the 20 essential amino acids, has two ionizable hydrogens.At 25°C, K_a1 = 1.38 * 10^-4 and K_a2 = 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

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