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22 March, 21:14

You are given sodium acetate, 1m hcl, nahco3 and na2co3. Determine which of these four you would need and then show calculations to make buffer ph

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  1. 22 March, 21:36
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    solution:

    the given compounds are sodium acetate, 1M HCL, NaHCO₃ and Na2CO₃

    pH of the buffer solution is 4.7

    the value of pKa of sodium bicarbonate is 6.37

    the value of pKa of acetic acid is 4.7

    calculate concentration of acetic acid by using the following forumula

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

    substitute the pH and Pka values in the formula.

    4.7=4.7+log[salt]/[acid]

    log[salt]/[acid]=0

    thus, the concentration ratio of the salt and acid should be equal to each other.

    Thus, concentration of sodium acetate is 0.05M

    Concentration of sodium acetate = concentration of acid

    = 0.05M

    Volume of the buffer solution is 100mL

    The buffer solution can be prepared as 0.05M of 50mL sodium acetate will react with 0.05M of 50mL of 0.05M of HCL.

    The chemical equation for neutralization of the weak base with strong can be represented as show as

    CH₃COONa+HCL-->CH₃COOH+NaCL
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