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Percent Yield Experiment. The limiting reagent for this experiment is strontium chloride hexahydrate. The two products will be strontium sulphate as a solid and copper (II) chloride in an aqueous state.

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Introduction

´╗┐Percent Yield Lab By Sean Frank SCH3U - 11 University Chemistry Mr. Posteraro November 26th 2012 All Saints High School Hypothesis: The limiting reagent for this experiment is strontium chloride hexahydrate. The two products will be strontium sulphate as a solid and copper (II) chloride in an aqueous state. The predicted precipitate is strontium sulphate and the reaction should precipitate out approximatly 0.65 g of the substance. Materials: 1. 1 100 ml Wash Bottle 2. 2 50 ml Beakers 3. 1.00g Strontium Chloride hexahydrate 4. 1.00g Copper (II) Sulphate pentahydrate 5. 1 Glass Funnel 6. 1 Filter paper (type 2) 7. 1 250ml Erlenmeyer Flask 8. 100ml Water 9. 1 Digital Scale (precsision withtin a hundredth of a gram) 10. 1 Stirring Rod Apparatus: Procedure: 1. Fill the wash bottle with 100 ml of water 2. Using a digital scale, measure 1g of strontium chloride hexahydrate into a 50ml beaker. 3. Repeat step 2 with 1g of copper (II) sulphate pentahydrate 4. Using the control digital scale (teacher's scale), weigh the filter paper and record its weight. 5. Using the wash bottle, add enough water to the beaker containing the 1g of strontium chloride hexahydrate to completly dissolve the solid compound. Avoid adding any more than nessesary. ...read more.

Middle

Therefore there is 0.6888 grams of strontium sulphate Calculation 4: Percent Yeild Given: Mass of strontium sulphate precipitate 0.66 g Theoretical mass of strontium sulphate 0.6888 g Procedure: Yeild = (Experimental mass/theoretical mass) x 100 = 0.9582 x 100 = 95.82 % ? Therefore the percent yeild of strontium sulphate in this experiment is 95.82 % Calculation 3: Percent Error Given: Mass of strontium sulphate precipitate 0.66 g Theoretical mass of strontium sulphate 0.6888 g Procedure: Error = ((Theoretical yeild ? yeild) / theoretical yeild) x 100 = 0.0418 x 100 = 4.18 % ? Therefore the percent error of the strontium sulphate yeild in this experiment is 4.18 % Table 2: Theoretical calculations of the masses and moles of the reactants and products. SrCl2 - 6H20 Cu(II)SO4 - 5H20 SrSO4 Cu(II)Cl2 11H2O 1.00g 1.00g 0.6888g 0.5043g 0.7431g 266.58 g/mol 249.62 g/mol 183.64 g/mol 134.45 g/mol 18.01 g/mol 3.751x103- mol 4.006x103- mol 3.751x103- mol 3.751x103- mol 4.126x102- mol Analysis: 2. The percentage yeild in the experiment is 95.82 %, which is greater than the target yeild of 95 %. The following are possible factors that may contribute to acheiving a higher yeild. Firstly, it is possible that there was contamination from outside sources, such as lint or dust particles that could have fallen into the drying precipitate. ...read more.

Conclusion

First, the ammount of transfers were kept to a minimum in order to preserve as much of the orginal reactants as possible. Multiple transfers can cause reactants or precipitate to adhere to the walls of the beakers or the funnel. There are only two transfers present in this procedure. Second, the solutions were dissolved into aqeous solutions to facilitate a reaction and increase the ammount of reaction taking place. Without a solution, the two substances would not have reacted in a solid state. Solutions also increase the likeliness of the most possible reaction, because of its containment, as opposed to a gas, and the potion of the particles within, unlike a solid. Both reactants were dissolved into water in order to maximise the reaction and ensure it took place. The reaction was finally stirred for a mintute to maximise the reaction. The stirring added heat and motion, which is another form of heat, which allows more reactant to react properly. The heat increases the speed at which the particles move within the liquid, which leads to more collisions, and finally more reaction taking place. Finally, the original beakers and the funnel were washed down with water and passed through the filter to ensure all possible remaining reactant had been added to the apparatus. Refrences: 1. Nelson 11 Chemistry (2005) 2. http://ottawa.ca/en/env_water/water_sewer/water_wells/quality/facts/index.html 3. http://sargentwelch.com/pdf/msds/Strontium_Chloride_6-Hydrate_723.00.pdf 4. https://www.sciencelab.com/msds.php?msdsId=9923597 ...read more.

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