You will be using standard solutions that contain 2.197 ppm, 4.394 ppm, 8.789 ppm, 13.183 ppm KH2PO4. What is the concentration (ppm) of phosphorous

You will be using standard solutions that contain 2.197 ppm, 4.394 ppm, 8.789 ppm, 13.183
ppm KH2PO4. What is the concentration (ppm) of phosphorous (P) in those standards? Hint: recall that
ppm can usually be approximated as mg/L.