Write net ionic equations for the reactions, if any, that occur when the aqueous solutions listed below are mixed. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer. If there is no reaction, type "NONE" in the answer box.) (a) lead(II) nitrate and sodium chloride(b) silver nitrate and ammonium carbonate(c) lead(II) nitrate and sodium chloride(d) sodium phosphate and potassium nitrate(e) cobalt (III) chloride and sodium hydroxide

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.