An buffer is made from a 0.1M acid and a 0.25 M salt.
According to the equation
pH = pKa - log[acid]/[base]
the ratio acid:base is 1:2
What volumes are required to make a 1 dm3 solution?
The Attempt at a Solution
According to the 1:2 ratio we would need
333.3 cm3 of acid and 666.6 cm3 of base
However as the initial concentration of acid to base is 0.1:0.25 we instead say
volume acid = 333.3cm3
volume base = 666.6 cm3/2.5 = 266.6 cm3
volume water = 400 cm3
(all of these volumes are rounded to the nearest 0.1 cm3)
is this correct?