Titrations

Question 1

what is titration

Answer 1

a technique that measures the volumes of acid and alkali solutions that are needed in a neutralisation reaction.

Question 2

what would we need to know to calculate the titration of the alkali we were neutralising with an acid

Answer 2

1) the concentration of the acid to be added

2) the volume of the alkali

Question 3

what do indicators show in titrations

Answer 3

indicators show the end point of titrations by suddenly changing colours

Question 4

what must be considered when picking an indicator

Answer 4

the strength of the acid and alkali

Question 5

if both the acid and alkali are strong suitable indicators would be what

Answer 5

(Methyl orange) yellow in alkali –> red in acid

(Phenolphthalein) pink in alkali –> colourless in acid

Question 6

explain the method for the titration experiment

Answer 6

1) using a pipette, add a set volume of a strong alkali to a conical flask
2) add a few drops of a suitable indicator
3) place a strong acid , such as hydrochloric, of known concentration in a Burette
4) take an initial reading of the volume of acid in the burette
5) gradually add the acid to the alkali making sure you are swirling the conical flask as you add the acid, as you get to the end point start to add the acid at a slower rate
6) as soon as the indicator changes colour, stop adding acid
7) take a final reading of the volume of acid
8) subtract the final reading from the initial reading

Question 7

In a titration experiment, what are we trying to work out?

Answer 7

the volume of acid needed to neutralise the alkali