Question

Experiment 14: Solutions Name: Prelab: List three things that can increase the rate of dissolving a solid in a liquid. 1. 2. What are the two things that make up an aqueous salt solution? 3. What will be left in the evaporating dish after the salt solution is heated? 4. A student collects the following data when heating 10.0mL of a salt solution. Fin mass percent and molarity of the solution. 45.327g 35.198g 35.641g Mass of dish + salt solution Mass of evaporating dish Mass of dish+ NaCl Molarity: Mass %:

Answer 1

1. Three things that increases the rate of dissolution of a solid in water are increasing the temperature, increasing the surface area of solid and stirring the mixture.

2. Two things that make up an aqueous solutionare:

• the solvent should be water
• The solute should be an ionic solid like NaCl, KCl etc. or a polar compound.

3. After heating and complete evaporation of the salt solution, only the solid salt will be left in the dish.

- 4. Mass of salt solution = 45.3279 - 35.1989 10:1299 Mass of Naci = 35.6419 - 35.1989 = 0.4439 Mass % - Mass of race De X100% Mass of solution 0.443 9 x 100% = 4.37% 701299 0.4439 58.5 g/mol Moles of Nace - = 0.00757 mot moles of solute nolanity = volume of solution in 0.00757 ml = 0.757 molle (logos = 10.757 m