Investigation into the solubility of Calcium Hydroxide Ca(OH)2

Investigation into the solubility of Calcium Hydroxide Ca(OH)2

Planning

========

Calcium Hydroxide is a strong base which is alkaline in water. Lime

water containing approximately 0.015 mol dm-3 will be used for the

titration. HCl will be used also, and has a concentration of 0.3 mol

dm-3 .

Aim:

The aim of the investigation is to determine the solubility of Calcium

Hydroxide by calculating the concentration by means of a titration.

Plan:

Clamp stand

Burette

[IMAGE][IMAGE][IMAGE]Titration equipment will be used to carry out

this experiment.

The equation for the reaction is shown below:

Ca (OH) 2 + 2HCl à CaCl2 + 2H2O

Lime water containing Calcium Hydroxide

Diagram:

[IMAGE]

[IMAGE]

[IMAGE]

Apparatus and equipment:

· Burette (50cm3 )

· 2 x Glass Pipette (25cm3)

· Rubber Pipette filler

· Standard Volumetric Flask (250cm3)

· Glass funnel

· 2 X Beakers (100cm3 )

· Clamp Stand and clamp

· White Tile

· Methyl Orange Indicator (bottle)

· Dropping pipette

· Conical flask (500cm3)

· De-ionised Water in delivery bottle

· HCl acid (plentiful amounts)

· Lime Water (plentiful amounts)

· Stoppers to seal bottles

· Lab coat and safety goggles

Hannah Brougham 2192

The acid needs to be diluted to prevent an extraordinarily high titre

figure occurring.

The acid provided is 0.3 mol dm-3 and needs to be diluted to a figure

of around 0.03, double the approx. concentration of the calcium

hydroxide. This means that it must be diluted by 10 times.

This is calculated as follows:

Original Acid

Diluted Acid

Concentration

0.3 mol dm-3

0.03 (0.075 / 0.25) mol dm-3

Volume

0.25 dm3

0.25 dm3

Num. of moles

0.075 mol dm-3

0.075 mol dm-3

N- number of moles C- concentration V- Volume