What is the concentration of a solution, in parts per million, if 0.02 gram of #Na_3PO_4# is dissolved? Chemistry Solutions Solving Using PPM (Parts Per Million) 1 Answer anor277 Apr 28, 2016 #1# #"ppm"# #=# #1*mg*L^-1#. You have not given us a volume Explanation: A #"ppm"# is so called because #1# #L# of water has a mass of #1# #kg#, i.e. #10^6# #mg#. So if you have #0.020# #g#, you have #20xx10^-3*g#, that is #20# #mg# or (!!IF THERE IS ONE LITRE OF SOLUTION!!) #20# #"ppm"#. Answer link Related questions What is PPM? How can PPM be calculated in chemistry? Why is PPM a useful measurement? Question #742ad Question #797aa H2S (g) concentrations of 660ppm is dangerous. (6) H2S generators continually release all of the... How many grams to toothpaste to kill a rat? One of the leading toothpaste brands advertises... Question #12b01 Question #76a8d How many grams of #NaCl# should be weighed to prepare 1 L of 20 ppm solution of #Na^+#? See all questions in Solving Using PPM (Parts Per Million) Impact of this question 12968 views around the world You can reuse this answer Creative Commons License