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# I am to determine the concentration of limewater solution by Titration method.

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Introduction

Chemistry coursework Planning work Determine the concentration of a lime water solution BY Nwabuisi Okonta Chemistry coursework Determine the concentration of a lime water solution Planning I am provided with 250cm3 of limewater which has been made such that it contains approximately 1gdm3 of calcium. Also available is hydrochloric acid which contains exactly 2.00 mol dm-3 I am to determine the concentration of limewater solution by Titration method. Apparatus used is as follows: * 50ml burette * 100ml conical flask * 100ml beaker * white tiles * resort tiles * safety goggles * pipette Chemicals used are: * 250cm3 of limewater which contains approximately 1g dm-3of CaOH * HCL solution (2.00 mol dm-3) ...read more.

Middle

You have already been told that the acid with which you have been supplied is too concentrated in its present form, so if it was used directly in a titration a ridiculously small volume would need to be added, maybe as little as 0.1 cm3 (which would be far too difficult to measure accurately). The quantities and concentration I was told that the Ca(OH)2 solution contains about 1gm-3 Molar mass of CaOH = ( Ca=40, O=16, H=1) ?moar mass CaOH=40+ (1�2+16�2) = 74g the concentration of the solution = 1 74 = 0.0135 mol dm-3 As I said above I should try to make the concentration of the acid about twice as much as this, i.e. ...read more.

Conclusion

Next add distilled water and make up "to the mark. Ensure then that the flask is upended several times to ensure thorough mixing. This dilution of 3.4 cm3 into 250 cm3 will give us an acid which has a new concentration of: (3.4/250) x 2.00 = 0.027 mol dm-3. Next I need to use a pipette to transfer 10.0 cm3 of the calcium hydroxide into a conical flask, add 3drops of a suitable indicator (methyl orange) then I will carry out the titration with the diluted acid. You should find that you obtain a titration reading of about 10 cm3, but you will need to work accurately and obtain at least three consistent readings. The final step is of course to calculate the precise concentration of the calcium hydroxide solution ...read more.

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Some errors are likely to come from measurements. A source of error would be parallax error, which would involve the meniscus. The parallax error would be present in the burette and pipette. This error must also be taken into consideration. Another form of human error would be the judgement in colour change. • Over 160,000 pieces
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