15 Questions
What does percent by mass (w/w) measure in a solution?
The mass of solute (in grams) for every 100 grams of solution
What does percent by volume (v/v) measure in a solution?
The volume of solute (in milliliters) for every 100 milliliters of solution
What does mole fraction measure in a solution?
The number of moles of a component of a solution divided by the total number of moles of all components
If 20 grams of sugar are dissolved in 80 grams of water, what is the percent by mass (w/w) of the sugar?
40%
If 30 milliliters of ethanol are mixed with 70 milliliters of water, what is the percent by volume (v/v) of ethanol?
30%
What does the percent by mass (m/m) measure in a solution?
The mass of solute (in grams) for every 100 grams of a solution
What does the mole fraction measure in a solution?
The number of moles of a component of a solution divided by the total number of moles of all components
What does the percent by volume (v/v) measure in a solution?
The volume of solute (in milliliters) for every 100 grams of a solution
What does the percent by mass per volume measure in a solution?
The mass of solute (in grams) for every 100 milliliters of a solution
What does the percent by volume per volume measure in a solution?
The volume of solute (in milliliters) for every 100 milliliters of a solution
What does the mole fraction measure in a solution?
The number of moles of a component divided by the total number of moles of all components
What does the percent by mass (m/m) measure in a solution?
The mass of solute in grams for every 100 grams of solution
What does the percent by volume (v/v) measure in a solution?
The volume of solute in milliliters for every 100 milliliters of solution
What does the percent by mass per volume measure in a solution?
The mass of solute in grams for every 100 milliliters of solution
If 25 grams of salt are dissolved in 125 grams of water, what is the percent by mass (w/w) of the salt?
25%
Study Notes
Solution Concentration Measures
- Percent by mass (w/w) measures the mass of the solute per unit mass of the solution.
- Percent by volume (v/v) measures the volume of the solute per unit volume of the solution.
- Mole fraction measures the number of moles of the solute per unit total number of moles in the solution.
Calculating Percent by Mass (w/w)
- If 20 grams of sugar are dissolved in 80 grams of water, the percent by mass (w/w) of the sugar is 20g/(20g+80g) x 100% = 20%.
- If 25 grams of salt are dissolved in 125 grams of water, the percent by mass (w/w) of the salt is 25g/(25g+125g) x 100% = 16.7%.
Calculating Percent by Volume (v/v)
- If 30 milliliters of ethanol are mixed with 70 milliliters of water, the percent by volume (v/v) of ethanol is 30mL/(30mL+70mL) x 100% = 30%.
Other Concentration Measures
- Percent by mass (m/m) measures the mass of the solute per unit mass of the solvent.
- Percent by mass per volume measures the mass of the solute per unit volume of the solution.
- Percent by volume per volume measures the volume of the solute per unit volume of the solution.
- Mole fraction measures the ratio of the number of moles of the solute to the total number of moles in the solution.
Test your knowledge of different ways to express the concentration of solutions, including percent by mass, mole fraction, molarity, molality, percent by volume, and ppm.
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