Give the formulas of all new molecules or ions formed when solutions of the foll

Question

Give the formulas of all new molecules or ions formed when solutions of the following are mixed. Write N.R. (for no reaction) if there is none. (a) Cl^-, Br^-, I^-, Fe^3+ ________ (b) Fe^2+, Br_2 water _____ (c) Cl^-, Br^-, I^-, Cl_2 water _____ (d) CO_2(g), NaOH, SrCl_2 _____ (e) SO_2(g), CaCl_2, HCI ____ (f) SO_3^2-, H_2O_2 (acid) ______ (g) S^2-, SO_3^2- (acid) _____ (h) Pb(C_2H_3O_2)_2, H_2S(g) _____ (i) Ag^+, Cl^-, NH_3 (excess) _____ (j) Ag^+, I^-, NH_3 (excess) ______ An unknown solution (I) is to be tested for the anions, or their derivatives, listed below right. (Derivatives are, e.g., PO_4^3- or H_3PO_4.) The following tests are performed on separate portions of the unknown. (a) when a test portion is acidified with HCI, and lead acetate is held in the mouth of the test tube, the paper turns black. (b) A test portion is acidified with HCI, boiled, and cooled; then Cl_2 water and hexane are added. After the mixture is shaken, the hexane layer is a clear, light reddish brown color. (c) Addition of an excess of HNO_3 produces a colorless gas that forms a white precipitate when bubbled through sodium hydroxide followed by addition of SrCl_2. On the basis of these tests considered as a whole, mark, at the right, a plus sign (+) for each ion or its derivative that is definitely present in the original solution, a minus sign (-) if the ion is definitely absent, or a question mark(?) if there is no evidence that the ion is present or absent.

Explanation / Answer

a) FeCl3 , FeBr3, FeI3 are precipitates

b) formation of FeBr2

c) Cl2 will cause formation of Br2 and I2

h) Pb(C2H3O2)2 + H2S = 2 CH3COOH + PbS

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