My data:
Mass of empty Erlenmeyer flask ____34.81_______
Mass of empty balloon ___1.79________
Mass of paper towel __.50_______
Mass of sodium bicarbonate + paper towel __5.23___
Mass of sodium bicarbonate __4.73______
Volume of acetic acid __40.0_______
Mass of Erlenmeyer flask + acetic acid _73.55________
Initial mass of Erlenmeyer flask + balloon + paper towel + sodium bicarbonate + acetic acid before start of reaction__80.57_______
Final mass of Erlenmeyer flask + balloon + paper towel + sodium bicarbonate + acetic acid at end of reaction, with inflated balloon attached __79.60_______
Final mass of Erlenmeyer flask + balloon + paper towel + sodium bicarbonate + acetic acid at end of reaction, with deflated balloon ___78.84_____
Mass of gas in the balloon __.80?___
The question is Calculate the percent mass of CO, in sodium bicarbonate using the empirical
(laboratory) method. To perform this calculation, you'll need the mass loss after the
balloon is removed from your reaction system, as well as the mass of sodium
bicarbonate that reacted. If sodium bicarbonate was your limiting reactant, then just
use the mass of sodium bicarbonate you weighed out. If acetic acid was your limiting
reactant, then you'll need to use stoichiometry to calculate the mass of sodium
bicarbonate that actually reacted.
Acetic acid was my limiting reactant
To calculate the percent mass of CO2 in sodium bicarbonate using the empirical method, we need to calculate the mass of sodium bicarbonate that reacted.
First, let's calculate the mass of sodium bicarbonate that reacted using stoichiometry. We'll assume acetic acid is the limiting reactant.
1. Calculate the moles of acetic acid used:
- Use the molar mass of acetic acid (CH3COOH) to convert the mass of acetic acid to moles.
- Moles of acetic acid = mass of acetic acid / molar mass of acetic acid
2. Use the balanced chemical equation between acetic acid and sodium bicarbonate to determine the mole ratio between them:
- The balanced equation is: CH3COOH + NaHCO3 -> CH3COONa + H2O + CO2
- The mole ratio between acetic acid and sodium bicarbonate is 1:1.
3. Calculate the moles of sodium bicarbonate using the ratio of moles between acetic acid and sodium bicarbonate:
- Moles of sodium bicarbonate = moles of acetic acid
Now, let's calculate the percent mass of CO2 in sodium bicarbonate.
4. Calculate the mass of CO2 released:
- Mass of CO2 released = mass of Erlenmeyer flask + balloon + paper towel + sodium bicarbonate + acetic acid before start of reaction - mass of Erlenmeyer flask + balloon + paper towel + sodium bicarbonate + acetic acid at the end of reaction with deflated balloon
5. Calculate the percent mass of CO2 in sodium bicarbonate:
- Percent mass of CO2 = (mass of CO2 released / mass of sodium bicarbonate) * 100
Using these calculations, you should be able to determine the percent mass of CO2 in sodium bicarbonate based on the given data.