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Back Titration Lab Report. In my experiment, I hoped to find the amount of calcium carbonate in some mineral limestone using the back titration method

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  • Essay length: 737 words
  • Submitted: 04/10/2011
  • Marked by teacher: (?) Patricia McHugh
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GCSE Aqueous Chemistry

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4 star(s)

This is a four star piece of work with excellent scientific knowledge of molar calculations and demonstrated great skill in their work. A clear, concise piece of work but they could have put more into the introduction and conclusion.

Marked by teacher Patricia McHugh 01/12/2012

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Back Titration Lab Report

Aim:

Determining the percentage purity of calcium carbonate in a sample of limestone.

Introduction:

In my experiment, I hoped to find the amount of calcium carbonate in some mineral limestone using the back titration method

The equation of the reaction is as follows:

2HCl + CaCO3 CaCl2 + CO2 + H2O

As not all the acid will be used up in the above reaction, I plan to obtain the amount of acid not used up and consequently the amount of calcium carbonate in the limestone, by titrating it with known sodium hydroxide solution. The equation of the reaction is as follows:

HCl + NaOH NaCl + H2O

Apparatus:

The equipment and reagents that I used are as follows:

250 cm3 beaker

Electronic balance (± 0.01 g)

250 cm3 volumetric flask (± 0.2 cm3)

50.0 cm3 burette (± 0.05 cm3)

25. 0 cm3 pipette (± 0.1 cm3)

3 x conical flasks

Clamp and retort stand

1.0 mol dm-3 hydrochloric acid, HCL

1.5 g

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MbT essay summary

This is a four star piece of work with excellent scientific knowledge of molar calculations and demonstrated great skill in their work. A clear, concise piece of work but they could have put more into the introduction and conclusion.

Marked by teacher Patricia McHugh 01/12/2012

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