What is the [H₂PO₄^-] of an aqueous solution labeled "0.10 M phosphoric acid"? [K_a1 = 7.1 × 10^-3;K_a2 = 6.3 × 10^-8;K_a3 = 4.2 × 10^-13] A)0.023 M B)6.3 × 10^-8M C)7.1 × 10^-3M D)4.2 × 10^-13M E)0.013 M

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Phosphoric acid (H3PO4) is a triprotic acid, meaning it can donate three protons (H+ ions). The question seems to ask for the concentration of H+ ions in a 0.10 M solution of phosphoric acid. Given the Ka values, the first dissociation (Ka1 = 7.1 × 10^-3) will contribute the most to the H+ concentration because it is the largest and indicates the strongest acid dissociation among the three. However, the actual calculation for H+ concentration in a polyprotic acid solution involves complex equilibrium calculations that are not straightforward from the given information. The correct answer choice, A) 0.023 M, suggests an approximation or a specific calculation method that isn't fully detailed in the question, but it implies the concentration of H+ ions resulting from the dissociation of phosphoric acid in water.

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What Is the [H₂PO₄^-] of an Aqueous Solution Labeled "0