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concentration of ion at equilibrium

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What is the concentration of A^3- ions at equilibrium for a 0.10 M solution of a hypothetical triprotic acid H3A, with Ka1 = 6.0 x 10^-3, Ka2 = 2.0 x 10^-8, Ka3 = 1.0 x 10^-14 ?

a) 9.1 x 10 ^ -21 M
b) 6.2 x 10 ^ -18 M
c) 3.1 x 10 ^ -15 M
d) 1.0 x 10 ^ -14 M
e) 4.8 x 10 ^ -19 M

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It shows how to calculate the concentration of ions at equilibrium for a weak triprotic acid solution. The solution is detailed and well presented.

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