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# Limiting Reagents Lab

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Introduction

Limiting Reagents Lab Design (D) Aspect 1: Problem: What mass of precipitate will form when 1.69g of CuCl2.2H20 reacts with 1.31g of aluminium? Aspect 3: Materials: > 150 mL beaker > Erlenmeyer Flask > 100ml Graduated Cylinder > Funnel; > Scoopula > Electronic Balance > Stir Rod > Aluminum Foil > CuCl2.2H20 > Distilled Water Procedure: Day 1 > Rinse beakerwith distilled water. > Mass 1.69g of CuCl2.2H2O. > Add to beaker and add 50mL of distilled water. > Mass aluminum. Fold in 1/2 & coil loosely. ...read more.

Middle

Aspect 1: Recording Raw Data: Mass of CuCl2.2H2O - 1.93g Mass of Al - ? (The massing of the aluminum was forgotten) Experimental mass of precipitate = .69g Aspect 2: Processing Data 2Al(s) + 3CuCl2.2H2O --> 3Cu(s) + 6H2O(l) + 2AlCl3(aq) m Al=1.93g M Al= 26.98 g/mol m 3CuCl2.2H2o = 1.69 g M 3CuCl2.2H2o = 152.47 g/mol (Chem 20 Data Booklet) m Cu = ? n CuCl2.2H2O = 1.93g / 170.49 g/mol n CuCl2.2H2O = .011320312 mol 3 mol CuCl2.2H2O = 3 mols Cu n Cu = .011320312 mol m Cu = .011320312 mol x 63.55 g/mol m Cu = .719g % yield = .69 / .719 = 96% Aspect 3: Experimental mass of Cu(s) ...read more.

Conclusion

Aspect 2: Evaluate: There were .029g of Cu precipitate less than expected. It is likely that some of the copper went into the Erlenmeyer or was stuck on the funnel. Despite thorough rinsing of the filter paper, some of the precipitate got through the filter paper and into the Erlenmeyer. Aspect 3 Improving Experimental Design: Instead of one piece of filter paper, two pieces should be used. This would lead to less precipitate going into the Erlenmeyer. Also, the water in the Erlenmeyer could be re-filtered. ?? ?? ?? ?? Page | 1 Syed Hasan ...read more.

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