HC Ch 15 Test

Approximately 38 g of NaCl can be dissolved in 100 g of water at 25 °C.

A solution prepared by adding 35 g of NaCl to 100 g of water at 25 °C is unsaturated.

(a)  

• True
• False

To prepare 20.0 mL of a 2.00 M solution of hydrochloric acid from a 10.0 M stock solution, you should take 4.00 mL of the stock solution and add 20.0 mL of water.

(a)  

• True

• False

The total mass of a solution is 153.4 g. The solvent mass is 125.2 g. What is the mass percent of the solute?

• 122.5%

• not enough information given

• 18.38%

• 81.62%

• 22.52%

An oven-cleaning solution is 40.0% (by mass) NaOH. If one jar of this product contains 454 g of solution, how much NaOH does it contain?

(a)  

• 1.14 × 10³ g

• 114 g

• 182 g
• None of these

• 18.2 g

A solution is prepared by dissolving 7.31 g of Na₂SO₄ in enough water to make 225 mL of solution. Calculate the solution molarity.

(a)  

• 1.64 M

• 3.11 M

• 0.136 M

• 0.229 M
• 30.8 M

What mass of solute is contained in 25.4 mL of a 1.56 M potassium bromide solution?

(a)  

• 3.02 g

• 4.72 g
• 186 g

• 119 g

• None of these

What volume of a 10.0 M HNO₃ solution is needed to completely neutralize 575 mL of a 4.10 M KOH solution?

(a)  

• 0.0236 mL

• 236 mL

• 2.36 mL

• 0.236 mL
• None of these

A 50.0 g sample of NaCl is added to water to create a 0.50 L solution. What volume of this solution is needed to create a 1.30 L solution that is 0.100 M NaCl?

(a)  

• 10.1 mL

• 76.0 mL
• 87.6 mL

• 255 mL

• 412 mL

You add 300.0 mL of water to 300.0 mL of a 2.00 M sugar solution. How many of the five options will change?

• 1

• 2

• 3

• 4

• 5

What volume of a 0.209 M Na2S solution contains 1.01 g of Na+ ions?

(a)  

• 1.43 L

• 0.21 L

• 0.651 L

• 3.78 L

• 0.105 L