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## Homework Statement

An buffer is made from a 0.1M acid and a 0.25 M salt.

According to the equation

pH = pK

_{a}- log[acid]/[base]

the ratio acid:base is 1:2

What volumes are required to make a 1 dm

^{3}solution?

## Homework Equations

## The Attempt at a Solution

According to the 1:2 ratio we would need

333.3 cm

^{3}of acid and 666.6 cm

^{3}of base

However as the initial concentration of acid to base is 0.1:0.25 we instead say

volume acid = 333.3cm

^{3}

volume base = 666.6 cm

^{3}/2.5 = 266.6 cm

^{3}

volume water = 400 cm

^{3}

(all of these volumes are rounded to the nearest 0.1 cm

^{3})

is this correct?

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