Finding the Concentration of Limewater in a Titration Using Hydrochloric

Finding the Concentration of Limewater in a Titration Using Hydrochloric

Acid as a reagent

Aim: The aim of this experiment is it to find the concentration of

Limewater in a titration experiment using hydrochloric acid of

concentration exactly 2.00M as a reagent.

Equipment: I will need a burette, 25ml pipette, pipette pump, white

tile, clamp stand, boss head, clamp, 250ml limewater, phenolphthalein,

100ml hydrochloric acid, volumetric flask, distilled water, conical

flasks, safety gear and a calculator.

Safety: Throughout this experiment normal lab rules will apply with

safety gear to be worn at all times e.g. goggles and lab coat, also

due to fact we are using hazardous chemicals their hazards must be

taken into account. It is also best to make sure you are working in a

well-lit area. The chemicals that we will use are limewater,

hydrochloric acid and Phenolphthalein. The hazards are as follows:

* Hydrochloric acid - Very corrosive, irritant.

* Limewater (alkali) - Irritant.

* Phenolphthalein - May cause irritation of the respiratory and

digestive tract if ingested.

The reaction between the hydrochloric acid and limewater will also

produce calcium chloride and water both of which have no hazards and

are not dangerous at all. Phenolphthalein will not react with any of

the other chemicals to produce anything dangerous. Also any reaction

involving HCl can often be quite violent so great care must be taken

however acids and alkalis tend only to be corrosive/damaging over

0.5mol and since we are using concentrations well below this it

shouldn't be a problem.

Method: To perform the titration the first thing that needs to be done

is to dilute the HCl to a suitable concentration, to increase the

accuracy of the results it would be helpful if the volume of the

alkali equalled the volume of the acid used. We know that the

concentration of the alkali is close to 1g/dm‾, which is roughly

equal to 0.013mol by using the equation

Mass = Mole * RAM.