Respuesta :
The preparation of 1 Liter of a buffer requires 250 mL sodium acetate, 250 mL acetic acid, and 500 mL water.
What is pH?
pH is given as the number of hydrogen ion concentrations in a solution. The pH of the buffer is given as:
pH = pKa + log [A⁻]/[HA]
For the buffer with acetic acid, the pH and pka are 4.8. Thus, the equation is given as:
1 = [A⁻]/[HA]
The moles of buffer is given as:
Moles buffer = Molarity × Volume
Moles buffer = 0.1 M × 1 L
Moles buffer = 0.1 moles
The moles of A⁻, acetate is given as:
The moles of acid = Moles of buffer / 2
Moles of acid = 0.1 moles/ 2
Moles of acid = 0.05 moles
The moles of acid are equivalent to the moles of acetate, thus:
Moles of acetate = 0.05 moles
The volume of 0.2 M acetic acid is given as:
Volume = Moles / Molarity
Volume of acetic acid = 0.05 moles / 0.2 M
Volume of acetic acid = 250 mL
Volume of sodium acetate = 0.05 moles / 0.2 M
Volume of Sodium Acetate = 250 mL
The preparation of 1 Liter of a buffer requires 250 mL sodium acetate, 250 mL acetic acid, and 500 mL water.
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