Questions
1. Using the concentration and volume of the solution, calculate the mass of copper (II) sulfate added to the solution.
2. When you added more water, did the concentration increase, decrease, or stay the same?
3. When you added more water, did the mass (and also the number of moles) of copper (II) sulfate increase, decrease, or stay the same?
What you did here is called a dilution. The volume increased and concentration decreased, but the amount of solute stayed the same.
Part 2. % (w/v) concentration
The picture shows an i.v. bag used in hospital settings.
Questions
1. If a solution says that it is 0.5% (w/v), how is this written? As practice, fill out the correct numbers below, remembering that a percent is per 100 so 100 should go in your denominator as shown.
$0.5\% = \frac{\text{g solute}}{100 \text{ mL solution}}$
