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I believe if you are given a pKa value you will have to use the concentration of H3O+ from that pKa equation to find the pH of the solution. Like if pKa=[H3O+][CH3COO-]/[CH3COOH]=2X10^-5 then you would have to know the other concentrations in the reaction to be able to find the concentration of H3O+ and thus the pH of the solution.
pKa is dependent on Ka so if the Ka is greater than 10^-7, then the pKa would be less than 7 but if Ka is less than 10^-7, then the pKa would be greater than 7.
Matt Sanruk 2H wrote:Wouldn't pKa give an integer thats less than 7?
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