Solubility and Concentration Calculations

What is the molarity of a solution that contains 10 grams of solute in 2 liters of solution? Note the molar mass of the solute is 2g/mol.

• 2.5 M

• 5 M

• 10 M

• 2 M

Using a solubility curve, determine the solubility of potassium nitrate (KNO₃) at 60°C.

• 110 g/100 g H₂O

• 80 g/100 g H₂O

• 50 g/100 g H₂O

• 70 g/100 g H₂O

Calculate the percent mass of a solution if 20 grams of sodium chloride (NaCl) is dissolved in 80 grams of water.

• 20%

• 25%

• 30%

• 15%

A solution is made by dissolving 50 mL of ethanol in 150 mL of water. What is the percent volume of ethanol in the solution?

• 20%

• 25%

• 33.3%

• 50%

Explain how you would determine the molarity of a solution if you are given the mass of the solute and the volume of the solution.

• Convert mass to moles, then divide by volume in liters.

• Divide mass by volume in liters.

• Multiply mass by volume in liters.

• Convert mass to grams, then divide by volume in milliliters.

Predict what would happen if 50 grams of KClO₃ was added into 100 grams of water at 50°C..

• 50 g will be able to be dissolved.

• 20 g will dissolve, and 30 g will remain undissolved.

• 50 g will dissolve, and 30 g can still be added.

• None will dissolve.

Tags

NGSS.HS-PS3-4

What is the percent mass of a solution if 5.92 mL sugar is dissolved in 90 grams of water? Sugar's density is 1.69 g/mL.

• 10%

• 11.8%

• 9.1%

• 12.5%

Describe the steps you would take to calculate the percent mass of a solute in a solution.

• Divide the mass of the solute by the total mass of the solution and multiply by 100.

• Divide the mass of the solute by the mass of the solvent and multiply by 100.

• Divide the mass of the solvent by the total mass of the solution and multiply by 100.

• Divide the mass of the solute by the total volume of the solution and multiply by 100.

How many milliliters of 5.0 M copper(II) sulfate solution must be added to make 160 mL of 0.30 M copper(II) sulfate solution? Your answer should be rounded to two significant figures, DO NOT put units.

Mathematical Equivalence

OFF