A solution is found to be 0.0942% by weight CoCl_3. What is the concentration of the Cl^1- ion expressed in ppm?
0.0942%by weight of CoCl3 means 0.0942 g of CoCl3 present in 100ml of Solution
molarity = W*1000/G.M.Wt * volume of solution ml
= 0.0942*1000/165.3*100 = 0.0057M
CoCl3 —————> Co^3+ (aq) + 3Cl^-
conc of Cl^- = 3*0.0057M = 0.0171M = 0.0171*35500 = 607.05ppm [ 1M = 35500ppm]