Stoichiometry Lab: Data Collection and Processing

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IB CHEMISTRY
Stoichiometry Lab

Data Collection and Processing

Item | Mass |
Small beaker (100 mL)| 47.0 grams|
Large beaker (150 mL)| 82.4 grams|
Mass of filter paper| 0.50 grams|
Mass of coffee filter| 1.00 gram|
150mL beaker + 20mL water + lead nitrate solution| 96.1 grams| 100mL beaker + 20mL water + sodium carbonate solution| 64.2 grams| Watch glass| 32.2 grams|
Precipitate + filter paper + coffee filter| 2.20 grams|
Precipitate + 150mL + coffee filter| 84.1 grams|
Uncertainty of electronic balance: ±0.001 grams

Uncertainty of 100 mL beaker: ±0.05 mL

Uncertainty of 150 mL beaker: ± 0.05 mL

Qualitative Data
Before reaction:
* Lead nitrate solution: translucent, dissolved, looks like water * Sodium carbonate solution: translucent, dissolved, looks like water After reaction:
* lead nitrate and sodium carbonate mixture: precipitate is at the bottom of the beaker while the water is at the top. The precipitate is white and opaque.

Data Analysis

Lead II carbonate + filter paper + coffee filter = 2.20 grams 2.20 grams – mass of filter paper – mass of coffee filter = mass of lead II carbonate 2.20 grams – 0.50 grams – 1.00 grams = 0.700 grams

0.700 grams = mass of lead II carbonate collected in the filter

Sodium nitrate + 150 mL beaker + coffee filter = 83.9 grams
84.1 grams – mass of 150 mL beaker – mass of coffee filter = mass of sodium nitrate 84.1 grams – 82.4 grams – 1.00 grams = .700 gram
.700 gram = mass of sodium nitrate and excess reactant collected in the water after the water was evaporated

1.00 g of sodium carbonate and 1.00 g of lead II nitrate was given to start the lab out with. To calculate the percent yield of lead II carbonate, the limiting reactant must be identified first. 1.00 g Na2CO3 x 1 mole106 g = 0.00943 mole Na2CO31.00 g Pb(NO3)2 x 1 mole331 g = .00302 mole Pb(NO3)2

Limiting reactant: lead II nitrate

Next, the theoretical yield of lead II...
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