Solution Concentration

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?

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

• True

• False

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

• False

• Sometimes true

• Depends on the temperature

• True

The ______ is the smaller part of the solution.

• solute

• solvent

• system of a down

This is a type of mixture where one substance dissolves into another

• Solution

• Miscibility

• Compound

• Solubility

To dilute something means to

• make it less concentrated or strong by adding something else

• keep it at the same concentration without adding anything else

• make it more concentrated by removing something else

• make it more diluted by adding something else