6. Record the volume of acid needed to neutralise the base. 7. Repeat the titration twice to get an accurate value of the acid needed to neutralise the base. 8. Calculate the volume of acid needed by getting the average of the acid from the two titrations.
9. Repeat the titration without the indicator. Add only the volume of acid needed to neutralise the base.
10. As you are reacting an acid and a base, the products in the conical flask will be salt and water. The salt and water can now be separated using an evaporating dish and a Bunsen burner as shown in Fig. 22.12 (2).
1 Carrying out the titration Pipette filler
Burette
Pipette
Dilute hydrochloric acid
25 cm3
of
sodium hydroxide solution
Sodium hydroxide and indicator solution
White tile (good background to observe a colour change) 2 Separation of the salt and water
Titration solution Evaporating dish
Tripod
Bunsen burner
( Fig. 22.12 Titration to carry out a neutralisation reaction
j Go to page 63 of your Experimental Investigations Log to write up this investigation.