# How do you find volume in a titration question?

Aug 19, 2016

See below.

#### Explanation:

There are different types of titration, but in here I will assume that the question is about the titration is an acid-base titration.

Assuming we want to find how much base should be added to an acid with a known concentration.

In the question, it should be provided the following data:

Concentration of the acid: ${M}_{a}$.

Volume of the acid: ${V}_{a}$

Concentration of the base: ${M}_{b}$

and we will need to determine the volume of the base (${V}_{b}$) needed to titrate the acid.

Assuming that the acid and the base are both monoprotic, such as: $H C l$ and $N a O H$.

In here we can say: ${n}_{{H}^{+}} = {n}_{O {H}^{-}}$

Since the relationship between the number of mole and molarity is:

$n = M \times V$, then we can say:

${M}_{a} \times {V}_{a} = {M}_{b} \times {V}_{b}$

Thus, the volume of the base needed to titrate the acid is:

${V}_{b} = \frac{{M}_{a} \times {V}_{a}}{{M}_{b}}$

Here is a complete lab demonstration on how to carry an acid-base titration in the lab along with the calculations thereafter:
Lab Demonstration | Acid - Base Titration.