Question

# The acetic acid and sodium acetate solutions will have concentrations of 0.50 M. 1. Calculate Concentrations...

The acetic acid and sodium acetate solutions will have concentrations of 0.50 M.

1. Calculate Concentrations of acetic acid and sodium acetate in the prepared buffer solutions in Part I as noted in the following table:

 Solution Voluem of Acetic Acid (mL) Volume of Sodium Acetate (mL) A 25 25 B 45 5 C 5 45 W 0 0

2. Calculate Theoretical pH of prepared buffer solutions

BUffer A

V acid = 25 mL and molarity 0f acid = 0.50M

V acetate = 25 mL and molarity = 0.5

Thus [acid ] in the buffer = 25x0.5/50

= 0.25 M

and [acetate ] in the buffer = 25x0.5 /50

= 0.25M

The pH of buffer is calculated by Hendersen equation

pH = pKa + log [conjugate base]/[acid]

= 4.74 + log 0.25/0.25

= 4.74

Buffer B

[acid] = 45x0.5/50 =

= 0.45 M

[acetate] = 5 x0.5 /50

= 0.05

Thus pH = 4.74 + log 0.05/0.45

= 3.785

Buffer C

[acid] = 5x0.5/50

= 0.05 M

[acetate] = 45x0.5/50

= 0.45

Thus pH = 4.74 + log 0.45/0.05

=5.694

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