How many moles of sodium hydroxide would have to be added to 150 mL of a 0.483 M acetic acid solution, in order to prepare a buffer with a p

Question

How many moles of sodium hydroxide would have to be added to 150 mL of a 0.483 M acetic acid solution, in order to prepare a buffer with a pH of 4.480

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Cherry 3 years 2021-08-13T18:00:42+00:00 1 Answers 5 views 0

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  1. taiduc
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    2021-08-13T18:02:10+00:00
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    Answer:

    0.068 moles of sodium hydroxide would have to be added to 150 mL of a 0.483 M acetic acid solution

    Explanation:

    As we know  

    pH = pKa + log [salt]/[acid]

    4.480= 4.74 + log [salt]/[acid]

    log [salt]/[]acid] = -0.06

    [salt]/[acid] = 0.87

    moles acid = 0.150 L x 0.483 mol/L = 0.07245 moles acid

    x/0.07245-x = 0.87

    X- 0.07245 X = 0.87 *0.07245

    X = 0.068 moles

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