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A 0.100 mol quantity of a monoprotic acid HA is added to 1.00 L of pure water. When equilibrium is reached, the pH of the solution is 3.75. What is the value of Ka for the acid HA?
15 years ago

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DrBob222
HA ==>H^+ + A^-
Ka = (H^+)(A^-)/((HA)

You find (H^+) from the pH. The (A^-) = (H^+) and (HA) = 0.1-(H^+)
Solve for Ka.
15 years ago

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