This document discusses different methods of expressing the concentration of solutions, including concentration by mass, percent concentration by mass or volume, parts per million and billion, and molarity. Concentration by mass refers to the mass of solute in a given amount of solution. Percent concentration expresses the mass or volume of solute as a percentage of the total solution. Parts per million and billion describe trace amounts of substances in water. Molarity expresses concentration as moles of solute per liter of solution or millimoles per milliliter.

1. Methods of expressing
Concentration
Reported By:Desiree Rhea Sone
BEED 1-3 Day

2. CONCENTRATION BY MASS
• The concentration of a solution may
be given as the mass of solute in a
given amount of solution.

3. CONCENTRATION BY PERCENT
• The concentration of a solution is often
expressed as percent concentration
by mass or percent by volume of
solutein solution.
Percent by mass=mass of solute

4. CONCENTRATION IN PARTS PER
MILLION (ppm) AND PER BILLION (ppb)
• are encountered more and more
frequently are become aware of the
effects of substance present in trace
amount of water

5. CONCENTRATION IN TERMS OF MOLES
• The concentration of a solution may be
stated as molarity (M),which is the number
of moles of solute per liter of solution or
the number of millimoles (nmol) (1
millimole= 10 mole) per milliliter of
solution.

6. CONCENTRATION IN TERMS OF MOLES
• The concentration of a solution may be
stated as molarity (M),which is the number
of moles of solute per liter of solution or
the number of millimoles (nmol) (1
millimole= 10 mole) per milliliter of
solution.