Question
Write an equilibrium reaction for a buffer system made of the weak base, B, and its conjugate acid. If the buffer contains 1.05 M of B and 0.750M conjugate acid and has a pH of 9.50, what is the pH after 0.0050 mol HCl is added to 0.500 L of this solution?
Answers
B + H^+ ==> BH^+
In 500 mL of the buffer we have millimols of
B = 500 x 1.05 = 525
BH^+ = 500 x 0.750 = 375
add 0.005 = 5 millimols HCl.
...........B + H^+ ==> BH^+
initial...525.........375
add............5..............
change.....-5...-5....5
equil.....520.....0....380
Plug into the Henderson-Hasselbalch equation and solve for pH.
In 500 mL of the buffer we have millimols of
B = 500 x 1.05 = 525
BH^+ = 500 x 0.750 = 375
add 0.005 = 5 millimols HCl.
...........B + H^+ ==> BH^+
initial...525.........375
add............5..............
change.....-5...-5....5
equil.....520.....0....380
Plug into the Henderson-Hasselbalch equation and solve for pH.
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