Question

For each of the following, write the molecular equation, including phase lables. then write the net ionic equation. Note that the salts formed in these reactions are soluble. 1) the neutralization of lithium hydroxide solution by aqueous chloric acid. 2) the reacton fo barium hydroxide solution and aqueous nitrous acid. 3) the reaction of sodium hydrogen solution and aqueous nitrous acid. 4) the neutralization of aqueous hydrogen cyanide by aqueous strontium hydroxide.

Answer 1

Q1.

molecular

LiOH(aq) + HClO3(aq) = H2O(l) + LiClO3(aq)

ionic

Li+(aq)+ OH-(aq) + H+(aq) + ClO3-(aq) = H2O(l) + Li+(aq) + ClO3-(aq)

net ionic (get rid of spectator ions Li+ and ClO3-)

OH-(aq) + H+(aq) + = H2O(l)

Q2

Ba(OH)2(aq) + HNO2(aq) -> H2O(l) + Ba(NO2)(aq)

balance

Ba(OH)2(aq) + 2HNO2(aq) -> 2H2O(l) + Ba(NO2)(aq)

ionic

Ba+2(aq) + 2OH-(aq) + 2H+(aq) + 2NO2-(aq) -> 2H2O(l) + Ba+2(aq) + 2NO2-(aq)

net ionic (Get rid of spectator ions Ba+2 and NO2-)

2OH-(aq) + 2H+(aq) -> 2H2O(l)

note that there will be some hydrolysis between

NO2-(aq) + H2O(l) <-> HNO2(aq) + OH-(aq) ; but ignore according to statement " Note that the salts formed in these reactions are soluble"

Q3

NaHCO3 + HNO3 -- >NaNO3(aq) +CO2(g) + H2O(l)

ionic

Na+(aq) + H+(aq) CO3-2(aq) + H+(aq) + NO3-(aq) --> Na+(aq) +NO3-(aq) + CO2(g) + H2O(l)

2H+(aq) + CO3-2(aq) --> CO2(g) + H2O(l)

Q4

HCN(aq) + Sr(OH)2(aq) --> H2O(l) + Sr(CN)2(aq)

balance

2HCN(aq) + Sr(OH)2(aq) --> 2H2O(l) + Sr(CN)2(aq)

ionic

2H+(aq) + 2CN-(aq) + Sr+2(aq) + 2OH-(aq) --> 2H2O(l) + Sr+2(aq) + 2CN-(aq)

net ionic

2H+(aq) + 2OH-(aq) --> 2H2O(l)

ignore hydrolysis between CN- and H2O