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:
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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
We finally took 1ml of the 0.01% solution from test tube using the glucose pipette and adding it to test tube 4, we then used the H2O pipette and added 9ml of H2O to test tube 4 creating 10ml of 0.001% solution.
in 5cm³ of water and add 4cm³ of ethanol. We had tom pour this mixture
pH 7.3 buffer – 75ml solution 1 to 25ml solution 2, mix – add 100ml
Investigating How Concentration of Acid Affects the Reaction Between Calcium Carbonate and Hydrochloric Acid Introduction = == == == ==
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This was allowed to mix for a few minutes; a little excess water was used to ensure that sodium bromide was fully dissolved. This mixture was placed in an ice bath while continuing to stir. 1.3 ml (24.39 mmols) of concentrated sulfuric acid was added dropwise. The flask was removed from the ice bath and heated to reflux for 1 hour while continuing to stir. The resulting top layer was transferred to a conical vial in which 1.5 mL (22.51 mmols) of 80 % sulfuric acid was added. 2.0 mL of water was added to allow a layer to form. The bottom layer was removed and transferred to another conical vial in which 2.0 mL of saturated sodium bicarbonate was added. The bottom, organic layer, was transferred to a conical vial. Calcium chloride, a drying agent, was used to collect the remaining aqueous layer that
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