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Aim : To investigate the percentage of CaCO3 in a sample of marble
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| Submitted: Thu Nov 24 2005
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Chemistry Practical Write-up Aim : To investigate the percentage of CaCO3 in a sample of marble Materials used : * Beaker * Conical Flask * Measuring Cylinder of 15 cc * Burette * Indicator * Clamp Stand * Pipette * Beam Balance * HNO3 of 2M concentration * NaOH of 2M concentration Procedure : * Crush the sample of marble in to small pieces, and take 1 gram of it in a beaker * Add excess of acid into the beaker, allow to react completely * Pipette 25 cc of the mixture into the conical flask * Add 2 drops of indicator (phenolphthalein) in the conical flask * Rinse the burette with NaOH, then fill it with the latter up to the 0 cc mark * Titrate the mixture with the base until color changes to purple. In the process, shake the conical flask thoroughly * Calculate the amount of base reacted * Repeat the titration again to improve accuracy. Data Collection : Burette reading (NaOH) / cc HNO3 + marble used (cc) Initial Final Used 0 19 19 25 0 18.8 18.8 25 0 18.5 18.5 25 Mass...
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