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concentration of limewater

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Introduction

Finding the concentration of limewater To find the concentration of 250cm( limewater containing approximately 1g dm-( I are going to add hydrochloric acid of exactly 2.00mol dm-(, to find the concentration as accurately as possible I am going to use a method called titration it is accurate because you can add the chemicals drop by drop so can see exactly the point when the chemicals have fully reacted and how much solution was needed. The chemical formula is For this experiment I will need: * A Burette 50cm( * A conical flask 250cm( * Volumetric flask 250cm( * Pipette 25cm( * Limewater solution 250cm( * Hydrochloric acid * Indicator-methyl orange * Distilled water * Funnel * Clamp and stand * Pipette filler To get an rough idea of the volume of 2.00mol dm-( hydrochloric acid I needed to use I needed to work out its theoretical volume. ...read more.

Middle

I will use a dilution factor of 100. I am going to make up 250cm( of 0.02 mol dm-( Hydrochloric acid. To do this I will add 2.5cm( and add 247.5cm( of distilled water I have chosen to make up to this volume to have enough to enable me to do repeat runs. For this experiment I am going to use methyl orange I am going to use it because it is best suited for strong acids and weak bases. If I were to use a different indicator it will give me a false reading. Then place 25cm( of the limewater into a conical flask using the pipette, then place under the titration equipment then put acid in the burette and record the amount at the start. ...read more.

Conclusion

This amount is used in the final calculations to work out the concentration in moles per litre of the limewater solution then the grams per litre. run 1 2 2 Final reading cm( Initial reading cm( Volume used cm( Chemical hazard 2.00 mol dm -( irritant limewater irritant Methyl orange Skin irritant Safety precautions Reason goggles To protect eyes from chemicals Lab coat To protect body and clothes gloves To protect hands from chemicals I used 2 sources to find the indicator required for this test: Letts- revise A2 chemistry pg 43 Indicators such as phenolphthalein should not be used because would change before the chemicals have reacted. For strong acids and weak bases Methyl orange would be more suitable WWW.chemguide.co.uk/physical/acidbaseeqia/idicators.html Methyl orange is one of the indicators used in titration when a strong acid v weak base are involved. ...read more.

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