Question

side up on top of the disn, but ipped sngitlyc Tm prop back into the evaporating dish. up will allow condensation to drain Gently heat the evaporating dish with a small flame until only a dry solid rema 5. Make sure no water droplets remain on the underside of the watch glass. 6. Turn off the gas burner. Allow the apparatus to cool for at least 15 minutes. Determine the mass of the cooled assembly. Record the mass of the dish resi and watch glass. 7. Reheat the evaporating dish and contents for two minutes, cool, and reweigh. 8. Rinse the residue down the sink. Wash Hands Data Mass of dish and glass Mass of dish, glass, and NaHCO 95.35 gn Mass of dish, glass, and residue (NaCl) After first heating Mass of dish, glass, and residue (NaCl) After second heating Om Analysis 1. Calculate the mass of the reactant, NaHCO 2. Calculate the number of moles of NaHCOs reacted. Pa

side up on top of the disn, but ipped sngitlyc Tm prop back into the evaporating dish. up will allow condensation to drain Gently heat the evaporating dish with a small flame until only a dry solid rema 5. Make sure no water droplets remain on the underside of the watch glass. 6. Turn off the gas burner. Allow the apparatus to cool for at least 15 minutes. Determine the mass of the cooled assembly. Record the mass of the dish resi and watch glass. 7. Reheat the evaporating dish and contents for two minutes, cool, and reweigh. 8. Rinse the residue down the sink. Wash Hands Data Mass of dish and glass Mass of dish, glass, and NaHCO 95.35 gn Mass of dish, glass, and residue (NaCl) After first heating Mass of dish, glass, and residue (NaCl) After second heating Om Analysis 1. Calculate the mass of the reactant, NaHCO 2. Calculate the number of moles of NaHCOs reacted. Pa

Thank you.

Answer 1

Solution-

1) Calculate mass of reactant NaHCO3

Mass of dish , glass and NaHCO3 - mass of dish and glass

=95.35-92.83

=2.52 g of NaHCO3

2) Number of moles of NaHCO3=?

We know molar mass of NaHCO3= 84.0066g/mol

Mass of NaHCO3= 2.52g

We can use formula-

Moles of NaHCO3= mass of NaHCO3/ molar mass of NaHCO3

= 2.52/ 84.0066

=0.02999 moles of NaHCO3

3)mass of product Nacl=?

Mass of dish ,glass and residue (NaCl) after second heating- mass of dish and glass

= 94.52-92.83

= 1.69 g of NaCl

4) mole of NaCl produced =?

Mass of NaCl= 1.69 g

Molar mass of NaCl=58.44g /mol

So moles of NaCl= mass of NaCl/ molar mass of NaCl

= 1.69/58.44

= 0.02891 moles of NaCl

5) Experimental mole ratio of NaCl/ NaHCO3=?

Moles of NaHCO3= 0.02999 moles

Moles of NaCl= 0.02891 moles

Molar ratio of NaCl to NaHCO3= 0.02891/0.02999

= 0.96

6) Balances reaction -

NaHCO3 + HCl = NaCl + H2O + CO2

7) by observing balance reaction it is clear that one mole of NaHCO3 would produced one mole of NaCl, so its molar ratio should be 1 theoretically.