The aim of this experiment is to determine the concentration of the given limewater solution in g dm.

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Assessed Practical

To determine the concentration of a limewater solution

Plan

The aim of this experiment is to determine the concentration of the given limewater solution in g dm. I have the choice of what apparatus I use and also the design of my own experiment. I am provided with the following:

Indicator (Methyl orange)

250cm3 of limewater (which contains approximately 1g dm of calcium hydroxide)

Hydrochloric acid (concentration of 2.00 mol dm ), which is too concentrated and needs to be diluted.

The following list provides information of the equipment, apparatus and chemicals used:

  • 250cm3 of limewater
  • Hydrochloric acid
  • Methyl orange (indicator)
  • Distilled water
  • Clamp and stand
  • White tile
  • Burette
  • Conical and volumetric flask
  • Pipette (25cm3)

Detailed method of procedure used

To start the experiment I firstly need to dilute the Hydrochloric acid. By using a pipette and a flask it is a good way of making sure the experiment is accurate. I need to dilute the acid to 0.125 moles. I achieve this by adding a 50:50 ratio of hydrochloric acid to distilled water. I then place half of this solution into the volumetric flask and again add another 50% distilled water. I measure the amount of water by looking on the graduated marks on the flask. I repeat this procedure 4 times until my target of 0.125 moles is achieved. When you have obtained the correct concentration of Hydrochloric acid you can proceed with the experiment. I set up the following apparatus:

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 In the flask I have used 25.0cm3 of limewater and a few drops of methyl orange. Obtained by using a pipette. By adding the drops of methyl orange the neutralisation point should be acquired. The solution should turn a light orange and proceed to pink at the end of the experiment.

By slowly adding the acid into the limewater the point where complete reaction occurs is when the indicator changes colour. This is known as the equivalence point. This experiment is then repeated several times in order to gain the necessary reliable results. ...

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