Solution Concentration

To calculate the concentration of a solution, multiply the mass of the solute (grams) with the volume of solvent (mL).

• True

• False

If 3.0 g of sugar is mixed in water to make 30 mL of solution, its concentration is:

• 0.1 g/mL

• 0.1 %

• 0.1 mL/g

• 1.0%

Suppose that a solution was prepared by dissolving 18.0 g of sugar into 100g of water. The percent by mass in the nearest whole number would be calculated as follows:

• 15%

• 18%

• 6%

• 82%

If a solution is made by taking 70 mL of ethanol and adding enough water to make 750 mL of solution, the percent volume is:

• 9.3%

• 10.7%

• 0.09%

• 70%

If a solution is prepared from 5g NaCl in enough water to make a 120mL solution, the mass-volume concentration is:

• 0.04%

• 4.2%

• 24%

• 6.7%

A 20g tube of cream contains 1.2% (w/w) of active ingredient. What is the mass of the active ingredient does the cream contain?

• 0.24%

• 2.4%

• 0.94%

• 9.4%

Which formula will you use for a problem looking for concentration by volume of ethanol in a solution?

Which formula will you use for a problem looking for the mass-volume concentration of NaCl in a solution?

The more solute you use, the more concentrated the solution is

• False

• Sometimes true

• Depends on the temperature

• True

The _____is the part that gets dissolved. 

• solute 

• solvent 

• solution 

• Sacajawea