This document defines parts per million (ppm) as the number of units of mass of a contaminant per million units of total mass. It provides an example that 1 ppm in soils and sediments equals 1 mg of substance per kg of solid. The document also presents the formula for calculating ppm and works through two practice problems calculating ppm concentrations given the mass of solute and solution. It finds that the concentration of calcium ions is 76 ppm in the first example and the concentration of ethanol is 230000 ppm in the second example.

1. PARTS PER
MILLION
March 2023
Bangui National High School
Axel Ahron C. Cadavona
Delmar Mabini

2. Amount of the solute
present in one million
parts of the solution.
PARTS PER
MILLION

3. Parts per million (ppm) is the number
of units of mass of a contaminant per
million units of total mass. More: ppm
(or ppmm) is used to measure the
concentration of a contaminant in
soils and sediments. In that case 1
ppm equals 1 mg of substance per kg
of solid (mg/kg).
PARTS PER
MILLION

4. PARTS PER
MILLION (PPM)
FORMULA:
Parts per Million x
Mass of Solute
Mass of Solution
x 10
6
Mass of Solution = Mass of Solute + Mass of Solvent
UNIT OF MEASUREMENT:
ppm

5. PRACTICE PROBLEM #1
A 5.00 g sample of solution has 3.8x 10 g of
calcium ion. Calculate the concentration in ppm.
GIVEN:
-5
-5
Mass of Calcium Ion = 3.8x 10 g
Mass of Solution = 5.00g
FIND:
Concentration in ppm

6. PRACTICE PROBLEM #1
A 5.00 g sample of solution has 3.8 x 10 g of
calcium ion. Calculate the concentration in ppm.
SOLUTION:
-5
ppm x
3.8 x 10 g of Calcium Ion
-5
5.0g of Solution
x 10 =
6

7. PRACTICE PROBLEM #2
35 grams of ethanol is dissolved in 115 grams of
water. What is the concentration of ethanol in parts
per million (ppm)?
GIVEN:
Mass of Ethanol = 35 g
Mass of Solution = ?
FIND:
Concentration in ppm
Mass of Solvent = 115g

8. PRACTICE PROBLEM #2
FORMULA:
Parts per Million(ppm) x
Mass of Solute (g)
Mass of Solution (g/mL)
x 10
6
Mass of Solution = Mass of Solute + Mass of Solvent
35 grams of ethanol is dissolved in 115 grams of
water. What is the concentration of ethanol in parts
per million (ppm)?

9. PRACTICE PROBLEM #2
SOLUTION:
-5
I. Find the Mass of Solution
35 grams of ethanol is dissolved in 115 grams of
water. What is the concentration of ethanol in parts
per million (ppm)?
Mass of Solution = 35g + 115 mL = 150 mL/g

10. PRACTICE PROBLEM #2
SOLUTION:
-5
I. Find the PPM
35 grams of ethanol is dissolved in 115 grams of
water. What is the concentration of ethanol in parts
per million (ppm)?
ppm x
35g of Ethanol
150g/mL of Solution
x 10 =
6

11. PRACTICE PROBLEM #2
ANSWER:
-5
2.3x10 ppm
35 grams of ethanol is dissolved in 115 grams of
water. What is the concentration of ethanol in parts
per million (ppm)?
5

12. GOOD JOB!

13. THANK
YOU
FOR
LISTENING!