Nitrate anion solution is prepared by dissolving 3g of potassium nitrate in 250ml of water. What is the concentration of nitrate anion in ppm, molarity, mass percentage?
1 Answer
(a) 7000 ppm; (b) 0.12 mol/L; (c) 0.7 % m/m.
Explanation:
(a) ppm
For
If we have 3 g
ppm is the number of "parts" of something in one million parts.
For example, we could express 1 ppm as a concentration of 1 g of solute in
If 250 mL of the solution has a mass of 250 g then
(b) Molar concentration
Assume there is no volume change on dissolving. Then
(c) Mass percentage
Note: The answers can have only one significant figure because that is all you gave for the mass of potassium nitrate.