The chemical reactions that are used in the anion spot tests in this experiment

Question

The chemical reactions that are used in the anion spot tests in this experiment are for the most part simple precipitation or acid-base reactions. Given the information in each test procedure, try to write the net ionic equation for the key reaction in each test.

A) CO3^2- Add 1ml of 6 HCl to 1 M Na2CO3

B) SO4^2- Add 1ml of 6 M HNO3 to 1 ml of 0.5 M Na2HPO4, then Add 1ml of 0.5 M (NH4)2MoO4

C) PO4^3- (Reactants are HPO4^2-, NH4^+, MoO4^2-, and H^+; products are (NH4)3PO4•12MoO3 and H2O; no oxidation or reduction occurs.) Add 1 ml 6 M HCl to 1 ml of 0.5 M Na2SO4. Add a few drops of 1 M BaCl2.

D) SO3^2- Add 1ml 6 M HCl to 1ml 0.5 M Na2SO3, then add BaSO4

E) SCN^- Add 1 ml 6 M acetic acid HC2H3O2 to 0.5 M KSCN then add 1-2 drops of 0.1 M Fe(NO3)3

F) Cl^- Add 1ml 6 M HNO3 to 1 ml 0.5 M NaCl. Add 2-3 drops of 0.1 M AgNO3

G) NO3^- (Take as reactants Al and NO3^-; as products NH3 and AlO2-; final equation also contains OH- and H2O as reactants). Add 1ml 6 M NaOH to 1 ml 0.5 M NaNO3, then add Al metal granules.

Explanation / Answer

A) the reaction will be

2HCl + Na2CO3 --> 2NaCl + H2O + CO2

Net ionic equation

2H+ + CO3-2 --> H2CO3 --> H2O + CO2

B) Ba+2 + SO4-2 --> BaSO4(s)

C) 12MoO42- + 3NH4+ + PO43- + 24H+ (NH4)3[P(Mo12O40)] + 12H2O

D) SO3-2 + Ba+2 --> BaSO3(s)

E) Fe3+(aq) + SCN-(aq) Fe(SCN)2+(aq)

F) AgNO3 + NaCl ---> AgCl(s) + NaNO3

Ag+ + Cl- --> AgCl [Net ionic equation]

G) Al + NO3- --> NH3 + AlO2-

NH4+ + OH- --> NH3 +H2O

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