Determining the Volume of Acid that Will React with a Carefully Measured Volume of Alkalai
Aim
The aim of this experiment is to determine the volume of acid that
will react with a carefully measured volume of alkali (base).
Prediction
==========
Universal indicator
-------------------
Acid Alkali Neutral
Red Purple Green
Methyl orange
Acid Alkali Neutral
Red Yellow Yellow
Methyl red
Acid Alkali Neutral
Orange Blue Red
Phenolphthalein
Acid Alkali Neutral
Clear Purple Clear
My prediction when using 10ml of 0.02m solution of sodium hydroxide
(NaOH) is that 75ml of hydrochloric acid (HCl) will be needed for
neutralisation. I also predict that when using 10ml of 0.15m solution
of sodium hydroxide is that 15ml of sulphuric acid (H2SO4).
I also predict that when I add the acid and bases together they will
react forming other chemicals as such: -
NaOH + HCl = H2O + NaCl
The sodium hydroxide and the hydrochloric acid will react together and
produce water and sodium chloride.
2NaOH + H2SO4 = H2O + Na2SO4
The sodium hydroxide and the sulphuric acid react together and produce
water and sodium sulphate.
Method
The apparatus was set up as shown.
Universal indicator was used to show firstly the acid and alkali and
secondly that the neutralisation had taken place. 10ml of 0.15m NaOH
was placed in a conical flask and after making sure that the tap on
the burette was closed, 0.02m of HCl was placed into the burette. This
was released slowly until the indicator turned green showing
neutralisation had taken place. The test was repeated exactly but
instead of HCl, H2SO4 with a molar of 0.1 was used in its place. The
amount of acid used to neutralise the base was recorded in both cases.
The type and volume of acid that was used in these tests were
variable.
Safety
Normal laboratory safety conditions applied.
Other safety precautions that had been taken were goggles were worn to