pH of (a) = 5.081 and pH of (b) = 4.479. The effective buffer is 1.0M CH3COONa / 2.0 m CH3COOH.
What is buffer solution?
Buffer Solution is a water-based solvent-based solution composed of a weak acid and its conjugate base, or a weak base and its conjugate acid.
We know that,
pH = pKa + log[salt] / [acid]
For 1.0M CH3COONa / 2.0 m CH3COOH
Given,
[Salt] = CH3COONa = 1.0M
[Acid] = CH3COOH = 2.0M
pKa of CH3COOH = 4.78
Subsituting the values,
pH = 4.78 + log[1.0] / [2.0]
pH = 4.78 + 0.3010
pH = 5.081
For 0.1M CH3COONa / 0.2M CH3COOH
Given,
[Salt] = CH3COONa = 0.1M
[Acid] = CH3COOH = 0.2M
Subsituting the values,
pH = 4.78 + log[0.1] / [0.2]
pH = 4.78 + (-0.3010)
pH = 4.479
The effective buffer is 1.0M CH3COONa / 2.0 m CH3COOH because the higher the concentrations, the bigger the total buffer capacity.
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