Which of the following reactions are metathesis reactions? (a) 2KClO_3 rightarro

Question

Which of the following reactions are metathesis reactions? (a) 2KClO_3 rightarrow 2KCl + 3O_2. (b) Cu (NO_3)_2 + Zn rightarrow Cu + Zn(NO_3)_2 (c) BaCO_3 + 2 HCl rightarrow BaCl_2 + H_2O + CO_2 (d) Na_2CO_3 + CuSO_4 rightarrow Na_2SO_4 + CuCO_3 a. How many grams of each of the following substances will dissolve in 100 mL of cold water? Consult a handbook or the Intemet and cite your source. Ce(IO_3)_4 RaSO_4 Pb(NO_3)_2 (NH_4)_2 SeO_4. b. Which of these substances is least soluble on a gram-per-100 mL basis? Suppose you have a solution that might contain any all of the following cations: Cu^2+, Ag^+, Ba^2+, and Mn^2+. The addition of HBr causes a precipitate to form. After the precipitate is separated by filtration, H_2 SO_4 is added to the supernatant liquid, and another precipitate forms. This precipitate is separated by filtration, and the solution of NaOH added to the supernatant liquid until it is strongly alkaline. No precipitate is formed. Which ions are present in each of the precipitates? Which cations are not present in the original solution? Write balanced net ionic equations for the reactions, if any, that occur between (a) Fe_2 S_3(s) and HBr(aq), (b) K_2 CO_3 (aq) and Cu(NO_3)_2 (aq), (c) Fe(NO_3)_2 (aq), and (d) Bi(OH)_3 (s) and HNO_3 (aq)

Explanation / Answer

1) A general equation for a metathesis is

AX+CYAY+CX

where A and C are cations

         X and Y are anions.

For option (d),

Na2+ + CO3-- + Cu++ + SO4--   ------> Na2SO4 + CuCO3

Here, Na2+ & Cu++   are cation

CO3--   & SO4--    are anions

Therefore this reaction is metathesis reaction.

2)

a) Solubility of given product at 20 0C in 100ml of water

Ce(IO3)4 = 0.123

RaSO4 = 2.1×104

Pb(NO3)2 = 54.3

(NH4)2SeO4 = 115

b)

RaSO4 is least soluble in 100ml of water.

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