Consider the following flasks: What is the definition of a solution? ____ Which

Question

Consider the following flasks: What is the definition of a solution? ____ Which of the above flasks contain a solution? ____ Which of the above flasks contain a dilute solution? ____ Which of the above flasks contain a concentration solution? Which of the above flasks contain a saturated solution?____ What would you need to do to the third flask to make all the solute dissolve at room temperature What is "M" an abbreviation for? _____ What are the units of "M"? ____ What is the name of the glassware in the above illustration? _____ What are the solute _____ and the solvent ____ in the above flasks? Which of the mixtures would you expect to have the lowest freezing point? ____ If you were going to make 50 mL of a 1.00 M solution of sodium chloride, how much sodium chloride would you need to use? (Show calculations below.) ______

Explanation / Answer

1. A solution is a homogeneous mixture of two or more substance. In this case, NaCl dissolved in water to yiels a homogeneous solution.

2. 1 and 2 are the solutions. 3 is not homogenous and it cannot be considered as a solution.

3. 1 contains dilute solution. Molarity is the unit of concentration and it can be considered as the number of moles of solute dissolved in 1000 mL solution. 1 is 0.1 M, 2 is 3 M and 3 is 6 M

thus dilute solution, the one with less molarity, is 1

4. 2 is concentrated solution. Since third contains precipitate, we cannot consider it as a perfect solution. Among 1 and 2, 2 is having the high concentration.

5. A saturated solution contains the maximum concentration of a solute dissolved in the solvent and it contains little amount of additional solute. Thus 3 is the saturated solution

6. Increase the solvent amount.

7. Molarity, it is the unit of concentration and it can be considered as the number of moles of solute dissolved in 1000 mL solution. Its unit is moles/liter, moles/dm3

8. Standard flask

9. Sodium chloride (NaCl) as solute and water as solvent

10. 3, saturated solution. Freezing point depression is a colligative property, which depends on the number of solute particles. the maximum concentration of NaCl is present in 3.

11. Since Molarity is the number of moles of solute in 1000 mL solution.

first we have to find the number of moles in 50 mL = (1/1000) x 50 = 0.05 moles

molar mass of NaCl is 58.44 g/mole

number of mole = mass/ molar mass

mass of NaCl = number moles x molar mass = 0.05 x 58.44 = 2.922 g

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