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Solution: Calculate the concentration of each species present in a 0.010-M solution of phthalic acid, C6H4(CO2H)2.C6 H4(CO2 H)2(aq) + H2 O(l) ⇌ H3 O+(aq) + C6 H4 (CO2 H) (CO2 )−(aq)        K a = 1.1 × 10−3C6 H4(CO2 H)(CO2)(aq) + H2 O(l) ⇌ H3 O+(aq) + C6 H4(CO2)2 2−(aq)            K a = 3.9 × 10−6

Problem

Calculate the concentration of each species present in a 0.010-M solution of phthalic acid, C6H4(CO2H)2.

C6 H4(CO2 H)2(aq) + H2 O(l) ⇌ H3 O+(aq) + C6 H(CO2 H) (CO)(aq)        K a = 1.1 × 10−3
C6 H4(CO2 H)(CO2)(aq) + H2 O(l) ⇌ H3 O+(aq) + C6 H4(CO2)2−(aq)            K a = 3.9 × 10−6