a) A water sample has a copper (Cu) concentration of 25.2 mg/L. the density of the liquid is 1500 g/L. What is the concentration of Cu in ppm?
b) Infants drinking baby formula prepared with water containing nitrate concentrations exceeding 10.0 mg NO3- N/L (nitrate as nitrogen per litre) may have methemoglobinemia. The nitrate concentrations of three rural well waters are 30 mg NO3-/L, 40 mg NO3-/L, 50 mg NO3-/L. Do theses waters exceed the critical 10.0 mg NO3- N/L level?