Making Solutions - REVIEW

What does molarity (M) measure in a solution?

• The volume of solute

• The number of moles of solute per liter of solution

• The mass of solvent per liter

• The density of the solution

Tags

NGSS.HS-PS1-5

Why is it important to use *liters* (not milliliters) when calculating molarity?

• Because molarity is based on mols per kilogram

• Because the molarity formula only works with liters

• Because milliliters are too small to matter

• Because solutions can only be prepared in 1L containers

What must you do *before* adding a solute when preparing a solution from a solid?

• Heat the container

• Measure the total mass of the container

• Zero the balance and measure the correct mass of solute

• Add solvent

When making a solution by dilution, what is being changed?

• The total mass of solute

• The identity of the solute

• The concentration of the solution

• The temperature of the solvent

Tags

NGSS.HS-PS1-5

What happens to the concentration of a solution if you add more solvent without adding solute?

• The concentration increases

• The concentration decreases

• The concentration stays the same

• The solution becomes saturated

Why is molarity temperature-dependent?

• Because temperature affects molar mass

• Because volume expands or contracts with temperature

• Because moles of solute change with temperature

• Because heat causes solute to evaporate

What does it mean if a solution is *saturated*?

• No solute is present

• No more solute can dissolve at that temperature

• The solution has evaporated

• Only a small amount of solute has been added

What type of equipment is most accurate for measuring solution volumes?

• A. Beaker

• B. Graduated cylinder

• C. Volumetric flask

• D. Erlenmeyer flask

Which statement best describes a *supersaturated* solution?

• It contains less solute than a saturated solution

• It is impossible to make

• It holds more solute than normally possible at that temperature

• It is the same as a dilute solution

Why must you stir or swirl a solution after adding solute?

• To cool the solution

• To increase the pressure

• To evenly distribute the solute particles

• To change the identity of the solute