Chemistry experiment questions?

Question

Procedure:
1.put on goggles
2.use the balance to measure out 131g of sucrose
3.Place the sucrose in one 100-mL beaker. Add water to make 100 mL of solution. Stir until the sucrose dissolves,
4.Use the balance to measure out 31g of sodium chloride.
5.Place sodium chlloride in he other 100-mL beaker. Add water to make 100 mL of solution. stir until disolved
6. Add a pinch of additional sucrosee to the solution and stir. Continue adding until the solution unil it no longer dissolves.
7. Repeat step 6 for the sodium chloride solution, adding pinches of sodium chloride until the no longer dissolve

THE QUESTIONS!

1. what was the concentration of the solutioin containing 131g of sucrose? what wass the concentration of the solution containing 31 g of sodium chloride? which of the two solutes could dissolve at a higher concentration?
2. can you think of a difference between these two solids that mightacount for their differing solubilities?
3. which would dissolve better, dextrose,sugar,salt?

Answer 1

1) Concentration of a solution is generally in moles solute per liter soltuion, or Molarity.

Change the mass of each solute into moles of each solute by dividing by the molar mass of each:
131 g sucrose / 342 g per mol = 0.383 mol sucrose (C12H22O11)
31 g salt / 58.5 g per mol = 0.530 mol salt (NaCl)

Change the mL to L of solution:
110 mL = 0.100 L

Moles divided by liters is Molarity.
0.383 mol / 0.100 L = 3.83 M sucrose
0.530 mol / 0.100 L = 5.30 M salt

2) One reason for the difference in concentration and solutbility could be the size of the molecules (sucrose is much larger) and the type of bonds found in the molecules. Sucrose is a combination of polar and nonpolar covalent bonds. Salt is ionic bonds. Ionic bonds and polar covalent bonds will interact with the polar bonds of the water molecules and dissolve faster.

3) Salt will dissolve best. Dextrose and sugar both contain a combination of polar and nonpolar covalent bonds.

Answer 2

You wore safety goggles to mix salt, sugar, and water? Why? What safety equipment do you wear in the kitchen? Will there be a Federal Bureau of Comestibles Interdiction levying jackbooted State compassion upon every housewife who does not suit up before scrambling eggs or frying bacon?

"We know you're in there, freak! Come out with your French whisk held high in the air!"

Rat-tat-tat-tat-tat-tat-tat.

"Gee, Sarge, that was a close one! It looked like she was wielding tofu without a license."

THEY DIDN'T GIVE YOU GLOVES! and earplugs and forced air ventilation and a safety tether and boots and a Hopcalite breather and a carbon monoxide monitor... and six weeks of mandatory trauma counseling afterward. Did they medicate you?