Enough of a monoprotic weak acid is dissolved in water to produce a 0.0185 M solution. The pH of the resulting solution is 2.69. Calculate the Ka for the acid.

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Enough of a monoprotic weak acid is dissolved in water to produce a 0.0185 M solution. The pH of the resulting solution is 2.69. Calculate the Ka for the acid.

 

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Enough of a monoprotic weak acid is dissolved in water to produce a 0.0185 M solution. The pH of < Feedback
2.69. Calculate the K, for the acid.
The low pH of the solution indicates
that a relatively large amount of acid
has dissociated. Thus, although the
initial concentration of the acid is
2.2 x10-4
Ka =
0.0185 M, its equilibrium concentration
is significantly less than 0.0185 M.
Incorrect
Use the equilibrium concentrations in
the Ka expression, not initial
concentrations.
Transcribed Image Text:Enough of a monoprotic weak acid is dissolved in water to produce a 0.0185 M solution. The pH of < Feedback 2.69. Calculate the K, for the acid. The low pH of the solution indicates that a relatively large amount of acid has dissociated. Thus, although the initial concentration of the acid is 2.2 x10-4 Ka = 0.0185 M, its equilibrium concentration is significantly less than 0.0185 M. Incorrect Use the equilibrium concentrations in the Ka expression, not initial concentrations.
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