Titration Practical

Titration Practical

Planning assessment

The apparatus to be used:

· Beaker

· 250cm 3 volumetric flask

· Funnel

· Burette

· Pipette

· White tile

· Conical Flask

· Balance

· Spatula

· Weighing bottle

· Glass rod

Method

Making a standard solution:

A weighing bottle was accurately weighed and approximately 5g of

anhydrous sodium carbonate was added and the weight of the bottle plus

the solid recorded. The anhydrous sodium carbonate was then

transferred into a 100cm3 clean beaker. The bottle was carefully

rinsed out two or three times with water and the washings were

transferred to the beaker each time. About 25cm3 of water was poured

into the beaker and stirred with a glass rod until the solid had

completely dissolved. This solution was then added to a 250cm3

volumetric flask using a funnel. The beaker and funnel were swilled

thoroughly using a small amount of water these washing were then added

to the volumetric flask. Water was then added to the volumetric flask

until it was about 1cm below the graduation mark. The water was then

added slowly from a clean pipette so that at eye level the bottom of

the meniscus was just touching the graduation mark. The volumetric

flask was then stoppered and then inverted.

Carrying out a titration:

A conical flask was swilled out with water and a pipette and pipette

filler were used to withdraw 25.0cm3 of the sodium carbonate solution

from the volumetric flask and transfer it to the conical flask. A

burette was first swilled with sulphuric (VI) acid using a clean, dry

beaker and a funnel and then filled to below the zero mark. A little

of the solution was then run out of the burette into the beaker and

the funnel removed. A white tile was then placed underneath the

conical flask and a few drops of the indicator methyl orange was added

to the sodium carbonate solution.