Limiting Reagent lab report PDF

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Limiting Reagent lab report...

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Chem 200

Limiting Reagent of Solutions Section number: 05

Name: Miriam Gallegos

Part A. Making Chalk Experimental data table Table 1. Volume of reagent used by both student Student 1 Volume of Reagent (mL) Student 2 Volume of Reagent (mL)

0.5 M CaCl2 19.3

1.5 M Na2CO3 9.81

24.4

4.94

Table 2. Student data Mass of watch glass + filter paper (g): Mass of watch glass + filter paper + precipitate (g):

Student 1 24.511

Student 2 24.521

26.584

25.033

Calculated results table 1. Balanced chemical equation: CaCl2(aq)+Na2CO3(aq)→CaCO3(s)+2NaCl(aq)

2. Table 3. Calculated results Theoretical yield of CaCO3

Student 1 .9658685g

Mass of CaCO3(actual yield) Percent yield%

Student 2 1.4728g

2.073g 214.6%

Show your calculation processes below (just for student 1): Volume of C  aCl2=19.3 mL concentration of CaCl2=0.5 M 19.3mL x 0.5M/1000mL= .00965 mol Theoretical yield of C  aCO3= .00965 mol x 100.09g/mol= .9658685g Mass of C  aCO3 (actual yield)= 26.584g-24.511g= 2.073g

0.512g 34.8%

Percent yield= 2.073g/.9658685g x 100%= 214.6%

Part B. Making Copper Hydroxide 1. Create a balance equation of the reaction of copper sulfate with sodium hydroxide: CuSO4(aq)+2NaOH(aq) Cu(OH)2(s)+Na2SO4(aq)

2. Experimental data and observations table: (watch the video on blackboard): Test tube # 1

Drops of 0.1M Drops of 0.1M Copper sulfate, Sodium Hydroxide, CuSO4 NaOH 4 20

Ratio of CuSO4: NaOH 1:5

2

8

16

1:2

3

12

12

1:1

4

16

8

2:1

5

20

4

5:1

Observations

The product mass increase,has sodium hydroxide left over Has more product than the first test tube Has equal amount of product Has more copper sulfate, The most precipitate. The least amount of product.

Discussion/Questions

1. Random error can be caused by the difference of the environment. Random error in this experiment can be based on the measurements, Systematic error can be during a measurement which can cause the numbers to be too high or low. This can happen if the scale wasn’t working. Accuracy is how close to the actual value but precision is the same value as the actual value. 2. I did notice a pattern at the ratio for the balanced reaction and the test tube with the most precipitate. 3. From part A the amount of CaCO3 precipitate was somewhat close to the actual value, just by 1 gram. 4. If the filter paper was touched with wet hands then the mass would be more than expected. Which will be a Loss product and the actual yield decrease. 5. If the beaker were not washed out into the filter paper then we won’t get the correct mass instead we would’ve gotten a lower mass. It would be shown as a loss of product. This would cause the limiting reactant to be lower because the left over would be on the filter paper....