Please. Please Pretty Please help:):) I need help only on question 10, and 11 (I

Question

Please. Please Pretty Please help:):) I need help only on question 10, and 11 (I dont need help with everything just put all the information on here incase you needed it)

Moles of CO2

evolved

.0174

Moles

.0192

Moles

2. Column 1: Record the mass of the beaker plus the water and vinegar.

3. Column 2: Add the mass of the Alka Seltzer tablet (3.0g) to the result of Column 1. This is the initial mass.

4. Column 3: Record the mass of the beaker with its solution after the reaction between the Alka Seltzer with the vinegar and water. This is the final mass.

5. Column 4: Calculate the mass of CO2 evolved in each beaker by subtracting the final mass from the initial mass.

6. Column 5: Calculate the number of moles of CO2 evolved in each beaker. The molecular weight of CO2 is 44.01 g/mole CO2.

7. Column 6: Calculate the number of moles of NaHCO3 that reacted in each beaker. (The molar ratio between evolved CO2 and the bicarbonate, HCO3-, is 1:1).

8. Column 7: Calculate the mass of NaHCO3 that was used up in the reaction for each beaker. The molecular weight of NaHCO3 is 84.007 g/mole.

9.Draw a graph by plotting the mass of reacted NaHCO3 in each beaker (y-axis) against the volume of vinegar (x-axis).

THIS IS WHERE I NEED HELP!!!! ONLY 10 and 11

10.From the graph of your results, what is the mass of NaHCO3 in an Alka Seltzer tablet? What is the percent mass of NaHCO3 in an Alka Seltzer tablet?

11. For each data point on your graph, indicate which reactant is limiting and which is in excess. Vinegar Volume [mL] Limiting Excess (Chart Below)

So I need help 10, and 11.

Hope all fo this makes sense and thanks for your help! I have been trying to figure out these questions for hours so decided to purchase Chegg since I was having so many difficulties.

Beaker # Beaker( water,vinegar) Mass (g) Initial Mass (g) Final Mass (g) Mass of CO2 evolved

Moles of CO2

evolved

Moles of NaCO3 consumed Mass of NaHCO3 1 115.000g 118.000g 117.318g .682g .0155 Moles .0155 Moles 1.302g 2 115.005g 118.005g 117.241g .764g

.0174

Moles

.0174 Moles 1.462 g 3 115.011g 118.011g 117.164g .847g

.0192

Moles

.0192 Moles 1.613g 4 115.016g 118.016g 117.133g .883g .0194 Moles .0194 Moles 1.630 g 5 115.021g 118.021g 117.138g .883g .020 Moles .020 Moles 1.680 g 6 115.027g 118.027g 117.143g .884g .020 Moles .020 Moles 1.680 g

Explanation / Answer

10.From the graph of your results, what is the mass of NaHCO3 in an Alka Seltzer tablet?

Clearly, the graph stops at 1.68 g of NaHCO3

so we can assume that more addition of vinegar/acid will not react

so

mass of NaHCO3 = 1.68 g approx

16. What is the percent mass of NaHCO3 in an Alka Seltzer tablet?

% NaHCO3 = mass of NAHCO3 / total mass * 100 = 1.68/3 * 100 = 56%

11. For each data point on your graph, indicate which reactant is limiting and which is in excess. Vinegar Volume [mL] Limiting Excess (Chart Below)

Limiting reactant before V = 8 mL of vinegar is ACETIC ACID, since there is NAHCO3 in excess

Limiting reactant at V = 8 mL = stoichiometric quantity, no excess

Limiting reactant after V = 8 mL of vinegar is NAHCO3, since there is ACETIC ACID in excess

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