Water C 1 Flashcards pp. 45-53

Water C 1 Flashcardspp. 45-53

Use the graph on pg. 46 to answer some of these

questions.

Give an example of a solute and a solvent.

Solvent: waterSolute: kool-aid (or

sugar)ORSolvent: laundry detergentSolute: grease stain

If you have 60g KNO3 at 40oC in 100g of water, is the solution…saturated, unsaturated or supersaturated?

Saturated

If you have 80g of KNO3 at 10oC, 100g of water, is the solution…saturated, unsaturated or supersaturated?

Supersaturated

If you have 70g of KNO3 at 80oC, in 100g of water, is the solution…saturated, unsaturated or supersaturated?

Unsaturated

What is the minimum amount of water needed to dissolve 70g KNO3 at 80oC?

At 80oC

160g KNO3 = 70g KNO3

100g H2O Xg

x = 43.8g

What mass of KNO3 will dissolve in 100g of water at 10oC?

About 20 g KNO3

How much KNO3 will dissolve in 250g of H2O at 50oC?

At 50oC

80g = X 100g 250g

x = 200g KNO3

If you have 50g KNO3 at 50oC, in 100g H2O how much more KNO3 must be added to saturate the solution?

80g is saturated so subtract 50g and 30g more of KNO3 must be added.

An alka-seltzer tablet is placed in water and then the medicine is consumed.Identify the 3 underlined substances as solute, solution and solvent.

Solute - Alka-seltzer tablet

Solvent - water

Solution - medicine

What is the percent concentration of a solution that contains 45g of weed killer in 1500g of water?

45 x 100(45g + 1500g)

=2.9%