Chemistry 112

Step 1

H₃PO₄(aq) + H₂O(l) → ← H₃O⁺(aq) + H₂PO₄^–(aq)

K_a1 = [H₃O⁺]_e[H₂PO₄^–]_e                             [H₃PO₄]_e = 7.1×10^–3

Initial0.037 0 0

Change–x +x +x

Equilibrium0.037 – x x x

Can we approximate? 0.037/0.0071 = 5.2 NO!

 

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