This document discusses different units for expressing concentration of solutions, including percent, parts per hundred (pph), and parts per million (ppm). It provides an example of calculating the concentration in percent by mass of a solution containing 25 g of sucrose dissolved in 175 g of water.

1. Percents, pph, ppm

2.  Quantity of solute dissolved in a specific
amount of solvent
 Concentration = mass of solute
------------------------------ X 100
Mass of solution
Hint:
solution = solute + solvent

3.  What is the concentration of the following
solution expressed as percent sucrose by
mass?
25 g of sucrose is dissolved in 175 g of water.

4.  60 g of sucrose is dissolved in 240 g of
water?