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Answer :
The total concentration of the buffer which was formed after the addition of 30 mL of 0.6M sodium acetate solution to 50 mL of 2M acetic acid solution can be determined as follows:
In order to calculate the total buffer concentration, we will need to find the concentration of the buffer acid and buffer base. Buffer acid is the acetic acid used to form the buffer and Buffer base is sodium acetate used to form the buffer.
Buffer Acid Concentration:
Volume of acetic acid solution = 50 mL = 0.050L
Concentration of acetic acid = 2M
Therefore, the number of moles of acetic acid in the solution = Concentration × Volume= 2M × 0.050 L= 0.10 moles
Molar mass of acetic acid = 60.05 g/mol
Mass of acetic acid in the solution = Number of moles × Molar mass= 0.10 mol × 60.05 g/mol= 6.005 g
Buffer Base Concentration:
Volume of sodium acetate solution = 30 mL = 0.030L
Concentration of sodium acetate = 0.6M
Therefore, the number of moles of sodium acetate in the solution
= Concentration × Volume= 0.6M × 0.030 L= 0.018 moles
Molar mass of sodium acetate = 82.03 g/mol
Mass of sodium acetate in the solution = Number of moles × Molar mass
= 0.018 mol × 82.03 g/mol
= 1.47654 g
Total Buffer Concentration:
The total concentration of buffer
= [buffer acid] + [buffer base]= (mass of acetic acid in the solution / molar mass of acetic acid) + (mass of sodium acetate in the solution / molar mass of sodium acetate)
= (6.005 / 60.05) + (1.47654 / 82.03)= 0.0999 + 0.018 = 0.1179 moles/L (total buffer)
Therefore, the total concentration of buffer is 0.1179 moles/L.
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