Convert the following molar concentration 2.9 x 10^-6 M Cd(NO3)2 solution to units of ppm. (Answer is 0.69 ppm)

1 Answer | Add Yours

ndnordic's profile pic

ndnordic | High School Teacher | (Level 2) Associate Educator

Posted on

You know the molar concentration, 2.9 x 10^-6 M, which means you have 2.9 x 10^-6  moles in one liter of solution.  One liter is 1000 mL or 1000 g since the density of water is 1g/ml

1.  Find the formula mass of Cd(NO3)2

2.  Multiply the formula mass * the molarity (2.9 x 10^-6 M), this tells you how many grams in 1000 grams.  Let this be X grams.

3.  Set up a ratio:  X grams (from #2)/1000 g = Y grams/1000000 g

Solve for Y, the # of grams in one million grams of water, which is also the ppm.


We’ve answered 319,842 questions. We can answer yours, too.

Ask a question