calculate the percet error in your experimentally determined k_as for the HC_2H_

Question

calculate the percet error in your experimentally determined k_as for the HC_2H_3O_2 solutions in Part III, using Equation 20 percent error % = (calculated K_s - literature K_a/literature k_a) (199%) (b) Are the magnitudes of your percent errors random, or do you see a pattern? Briefly explain. 3 Briefly explain why the pH change that resulted when you added 6M NaOH to the buffer solution was of a different magnitude than the pH change that resulted when you added aqueous NaOH to distilled water.

Explanation / Answer

Step 1: formula/equation:

CH3COONa----CH3COO- Na

Percent error; (calculed Ka-literature ka/literature ka)*100%

Step 2: know data:

Ka literature[CH3COOH]= 1.8X10-5

Ka calculated: Ka=[CH3COO-][Na]/[CH3COOH]

R// You need more information:

The value of acetic acid and acetate in molarity, volume. And then you can use the equation:

a) ka=[CH3COO-]2/[CH3COOH] and b) (calculed Ka-literature ka/literature ka)*100%

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