How do you find volume in a titration question?

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How do you find volume in a titration question?

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Answer 1 · 2016-08-19T20:21:12

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: $M_{a}$ $M_a$ .

Volume of the acid: $V_{a}$ $V_a$

Concentration of the base: $M_{b}$ $M_b$

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

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

In here we can say: $n_{H^{+}}^{+} = n_{O H^{-}}^{-}$ $n_(H^+)=n_(OH^(-))$

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

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

$M_{a} \times V_{a} = M_{b} \times V_{b}$ $M_axxV_a=M_bxxV_b$

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

$V_{b} = \frac{M_{a} \times V_{a}}{M_{b}}$ $V_b=(M_axxV_a)/(M_b)$

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.

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How do you find volume in a titration question?

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