Question
Asked Nov 4, 2019
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For 530.0 mL of a buffer solution that is 0.145 M in HC2H3O2 and 0.130 M in NaC2H3O2, calculate the initial pH and the final pH after adding 0.020 mol of HCl. 

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Expert Answer

Step 1

Ethanoic acid is a weak acid and dissociates as:

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CH,COОН — СHнзсоО -н

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Step 2

The intial pH can be calculated  using the following expression:

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[CH,COo H CH COOH

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Step 3

Rearranging above ...

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[CH,COo H [CH,COОН] [сH, COОH] CH,COO [н]-1.8х103x. K1.8x10mol/L at 25°C 0.145 H18x10 H 20x10 pH -logH og2.0x10 0.130 pН 34.69

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