How to Calculate Hydronium Ion Concentration and pH in Acetic Acid Solution

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To calculate the hydronium ion concentration and pH of a 0.10 M acetic acid solution, the dissociation constant (Ka) of acetic acid, which is 1.75 x 10^-5, is used. The expression for Ka is set up as Ka = [H3O+][A-]/[HA], where [H3O+] represents the hydronium ion concentration. By substituting the known values into this expression, the hydronium ion concentration can be determined. Subsequently, the pH is calculated using the formula pH = -log[H3O+]. This method provides a systematic approach to find both the hydronium ion concentration and the pH of the solution.
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a student prepared a 0.10 M solution of acetic acid, CH3COOH. acetic acid has a Ka of 1.75 * 10^-5. what are the hydronium ion concentration and the pH of the solution?

[hydronium ion] =
pH =
 
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Write out the expression for Ka and substitute what you know into the expression.
 

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