Stoichiometry Lab: Data Collection and Processing
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 Na2CO3 1.00 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
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 Na2CO3 1.00 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