C5.1.6 - Titration Calculations

Question 1

What do you learn from a titration?

Answer 1

The two reactants used
The volume and concentration of one of the reactants
Just the volume of the other reactant

Question 2

If 25cm3 of 0.100mol/dm3 sodium hydroxide solution was titrated with dilute hydrochloric acid, with the mean titre as 20cm3, calculate the concentration of the acid?

Answer 2

0. 100mol/dm3 * 0.025dm3 = 0.0025mol

0. 0025mol / 0.020dm3 = 0.125mol/dm3

Question 3

If 25cm3 of 0.400mol/dm3 sodium hydroxide solution was titrated with dilute sulfuric acid, with the mean titre as 10cm3, calculate the concentration of the acid.

Answer 3

0. 400mol/dm3 * 0.025dm3 = 0.010mol
1. 010mol / 2 = 0.0050mol
2. 0050mol / 0.010dm3 = 0.5mol/dm3

Question 4

What are the steps of a titration calculation?

Answer 4

1) Convert all volumes to dm^3
2) You will know the know the concentration and volume of one of the reactants. Calculate its amount.
3) Use the ration in the balanced equation to calculate the amount of the other reactant
4) Use the amount of reactant and volume to calculate concentration