0.3 [base] + [base] = 0.100 mol/L
1.3 [base] = 0.100 mol/L
0.100 mol/L
[base] = ------------
1.3
[base] = 0.077 mol/L
or equivalently, 7.7 X 10-2 mol/L
To determine the amount of salt required, substitute the calculated value of
the base concentration in the expression relating the salt and base concentration to the
desired mol/L concentration of the buffer.
[salt] = 0.100 mol/L - [base]
[salt] = 0.100 mol/L - 0.077 mol/L
[salt] = 0.023 mol/L
or equivalently, 2.3 X 10-2 mol/L
MD0837
9-21