Question

Solutions Experiment 2 Prelab Assignment (Due before lab starts) Name Lab Day / Time 1. Indicate which is the solvent and which is the solute in the following: Solvent Solute a. 50 mL H,O and 10 g sugar b. 150 ml H,0 and 50 mL isopropyl alcohol c. 150 mL H,0 and 250 mL isopropyl alcohol 2. Explain how stirring a solution would effect the rate of dissolving. 3. Explain how heating a solution would effect the rate of dissolving in terms of what happens to the molecules. 4. Reagents, A, B, and C, where tested with each other to determine their relative density using the procedure from Part 3. The following observations were made. Top Bottom A+B A+C 2. B+C Using the results, list the 3 reagents in order of increasing density less dense most dense

Answer 1

2. To identify the solute and solvent in a solution we must remember the following points - i If the two different compo- and forming the solution have a physical states (solid/ liquid / gas) same, then the compound with larger amount would be the solvent and the other would be the solute. i of the two different com- pould have different physic- al states, then the compound having the same physical state with the solution will be the solvent. Compounds having diffe rent physical states with the solution is called solute.

a 50 ml H20 and 10 g Sugar H2O liquid Sugar Solid The solution would be a syroup having phase liquid Thus, Solvent solute 50 mL H2O log Sing b. 150 mL H2O and 50 ml isopro byl alcohol H2o - liquid isopropyl liquid. alcohol Now, volume of 420 (150 m2) is grea- ter than isopropyl alcohol (50 m2) Thus Solvent Solute 150 mL 420 50 mL isoproobyl alcohol

= 150 mL H20 and 250 m2 isoproo. pyl alcohol : Both are liquid. Now, volume of isopropyl alcohol (250 m, is groeater than volume of H2o (150 ml) Thus, Solvent solute 250 mL isopropy) 150 ml of 420 alcohol
For the other answers please post them as another questions......