Question

Identify the equations that represent reactions that could occur. Select all that apply.

A) BaCl2(aq) + Na2SO4(aq) ==> BaSO4(s) + 2NaCl(aq)

B) NaBr(aq) + KCl(aq) ==> NaCl(aq) + KCl(aq)

C) NH4NO3(aq) + AgClO3(aq) ==> AgNO3(aq) + NH4ClO3(aq)

D) HCH3COO(aq) + NaHCO3(aq) ==> NaCH3COO(aq) + CO2(g) + H2O(l)

E) 2NaOH(aq) + CaCl2(aq) ==> 2NaCl(aq) + Ca(OH)2(s)

Answer 1

A reaction is apparently said to occur if it proceeds via the formation of a precipitate or a gaseous product, or a visible color change is observed after the reaction.

A)
`BaCl_(2)(aq)+Na_(2)SO_(4)(aq)-->BaSO_(4)(s)+2NaCl(aq)`: This reaction occurs as there is a formation of white precipitate of barium sulfate.

B) NaBr(aq)+KCl(aq)-->NaCl(aq)+KCl(aq): This reaction does not occur because all the ions just remain as spectator ions in the solution as the products are aqueous too.

C)
`NH_(4)NO_(3)(aq)+AgClO_(3)(aq)-->AgNO_(3)(aq)+NH_(4)ClO_(3)(aq)`: This reaction does not occur because all the ions just remain as spectator ions in the solution as the products are aqueous too.

D)
`HCH_(3)COO(aq)+NaHCO_(3)(aq)-->NaCH_(3)COO(aq)+CO_(2)(g)+H_(2)O(l)`:This reaction can be observed as this proceeds via the formation of gas bubbles of carbon dioxide.

E)
`2NaOH(aq)+CaCl_(2)(aq)-->2NaCl(aq)+Ca(OH)_(2)(s)`:This reaction occurs as there is a formation of white precipitate of barium hydroxide.

So the correct answers are:

A)
`BaCl_(2)(aq)+Na_(2)SO_(4)(aq)-->BaSO_(4)(s)+2NaCl(aq)`

D)
`HCH_(3)COO(aq)+NaHCO_(3)(aq)-->NaCH_(3)COO(aq)+CO_(2)(g)+H_(2)O(l)`

E)
`2NaOH(aq)+CaCl_(2)(aq)-->2NaCl(aq)+Ca(OH)_(2)(s)`