Consider a solution containing one of the following anions: CI^-, Br^-, I^-, SO_
ID: 1010249 • Letter: C
Question
Consider a solution containing one of the following anions: CI^-, Br^-, I^-, SO_4^2-, C_2O_4^2-, CO_3^2-, NO_3-. Use the following results to determine the anion's most likely identity. The solution does not liberate a gas when treated with concentrated sulfuric acid. The solution does not reduce an acidic solution of potassium permanganate. The solution does produce a white precipitate when treated with a Ba^2+/Ca^2+ solution; this precipitate is insoluble in 6 M HCI. What is the identity of the anoin? If more than one answer is possible, select all that are possible. I^- CI^- NO_3^- SO_4^2- Br CO_3^2- C_2O_4^2-Explanation / Answer
Answer-SO42- (sulphate)
SO42- + Ba2+---->BaSO4 (white ppt)
SO42- + Ca2+---->CaSO4 (white ppt)
these sulphates have very low solubility in HCl
Cl-,Br-,I- ,NO3- do not satisfy point 3 - soluble no precipitate formed
CO32- does not satisfy point one ,it liberates CO2 gas when treated with sulfuric acid
C2O42- does not satisfy point 2, reduces KMnO4/H+ to colorless from purple
5C2O42- +2MnO4- +16H+----->10CO2+8H2O+2Mn2+