Practice Molarity, Molality & Dilution Problems

When you make a dilution, which of these values remains constant?

• The molarity (M)

• The total moles of solute

• The volume (V)

• The concentration

As we dilute a solution.....

• The volume increases and the molarity (M) increases

• The volume increases and the molarity (M) decreases

• The volume decreases and the molarity (M) increases

• The volume decreases and the molarity (M) decreases

When Na₂O is added to water it reacts violently instead of making a solution. What is the molar mass of Na₂O?

• 62 g/mol

• 39 g/mol

• 55 g/mol

• 100 g/mol

The term molar which is used to describe a solution's concentration, is written as?

• M

• mol

• g

• g/L

When a solution is heated until it boils, the molarity...

• Doesn't change because everything evaporates

• Decreases

• Increases

• Will become 1M

Molarity is ...

• grams of solute/deciliters of solvent.

• grams of solute/liters of solution.

• moles of solute/liters of solution.

• moles of solute/milliliters of solvent.

Tags

NGSS.HS-PS1-5

50 ml of a 1 M solution is diluted until the final volume is 80ml. How much water was added?

• 50 ml

• 1.3 ml

• 30 ml

• 130 ml

2 moles of H₂O would weigh ____ grams

• 18 grams

• 9 grams

• 36 grams

• 2 grams

What is the molarity of a solution made by diluting 26.5 mL of 6.00M HNO₃ to a volume of 250 mL?

• 15.9 M
• 0.636 M
• 0.642 M
• 1.59 M

What is the molarity of a solution made by adding 1.565 moles of PbNO₃ to 500 mL?

• 300. M
• 31.3 M
• 3.13 M
• 1.56 M