+
Parts per Million

Parts per Million

Author: Jose Popoff
Description:

To calculate the concentration of very diluted solution samples in terms of parts per million.

 

When a solution is too diluted, it is preferable to refer to its concentration in terms of parts per million (ppm).

You will notice that the formula to determine parts per million is very similar to that for determining percent by mass.

One very important thing you must consider is that, since these solutions are very diluted, the mass of the solution is approximately equal to the mass of the solvent.   

 

In the case of water solutions, we will assume the density of such solutions to be equal to that of water (1.00 g/ml).

 

The formula to calculate parts per million is:

Notice that, if percent by mass was equal to the solute/solution ratio multiplied by 100, parts per million is the same ratio multiplied by 1 million.
 
Please review the following examples.
(more)
See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

25 Sophia partners guarantee credit transfer.

221 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 20 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Tutorial

Parts per million Example 1

Source: Basic Chemistry, Daub/Seese p. 376

Parts per million Example 2

Source: Basic Chemistry, Daub/Seese p. 376