Calculate the concentrations of acetic acid and sodium acetate in the buffer sol

Question

Calculate the concentrations of acetic acid and sodium acetate in the buffer solution you will prepare in the experiment:

Acetic acid concentration is _____________ M (2 dec places)

Sodium acetate concentration is ______________ M (2 dec places)

The theoretical pH of this buffer solution is (hint: use Henderson-Hasselbach) is ______________ (2 dec places).

Buffer Solution In Ihe Beaker Contains:

50 mL of a 0.20M NaC2H3O2 stock solution

10 mL of a 1.0M HC2H3O2 stock solution

Water is added until the total volume = 100 mL

Explanation / Answer

Acetic acid concentration = 0.2*50/100 = 0.1 M

Sodium acetate concentration = 1*10/100 = 0.1 M

pH = pKa+log [salt/acid]

    pka of ch3cooh = 4.74

pH = 4.74 + log [0.1/0.1] = 4.74

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