Question

question 1. Which of the following compounds are electrolytes and which are not?

KNO₃, H₂O, NaHCO₃, HBr, NH₃

the question 2. write the balanced chemical equation that show the dissociation of the ions in aqueous solution for the electrolytes you identify in question 1. Example: KCl (s) = K ⁺ (aq) + Cl ^- (aq)

question 3. Write balanced equations and balanced net ionic equation for the precipitation reactions:

i) When AgNO₃ react with Na₂S

ii) When Pb(NO₃)₂ react with Na₂CO₃

iii) When Ca(NO₃)₂ react with NaOH

iv) Fe(NO₃)₃ reacts with Na₂S

Answer 1

Question 1 : The compounds that

Electrolyte : KNO₃,NaHCO₃

Non-electrolyte :  H₂O, HBr, NH₃

Question 2 : The dissociation of the ions in aqueous solution for the electrolytes you identify in question 1

KNO_{​​​​​​3}(s) = K ⁺ (aq) + NO₃^- (aq)

NaHCO₃ (s) = Na⁺(aq) + ​​​​HCO₃^- (aq)

Question 3 :

Write balanced equations and balanced net ionic equation for the precipitation reactions:

i) When AgNO₃ react with Na₂S

2 AgNO₃ (aq) + Na₂S (aq) = Ag_{2^{​​​​​​}}S (s) + 2 NaNO₃ (aq)

ii) When Pb(NO₃)₂ react with Na₂CO₃

Pb(NO₃)₂(aq) + Na₂CO₃(aq) = PbCO₃ (s) + 2 NaNO₃(s)

Net ionic equation :

Pb⁺² + 2_{​​​​​}NO₃^- + 2 Na⁺ + CO₃^2- = PbCO₃ (s) + 2Na⁺ + 2NO₃^-

iii) When Ca(NO₃)₂ react with NaOH

Ca(NO₃)₂(aq) + 2 NaOH (aq) = Ca(OH)₂(s) + 2 NaNO₃(aq)

Net ionic equation :

Ca⁺² + 2 NO₃^- + 2Na⁺ + 2OH^- = Ca(OH)₂(s) + 2Na⁺ + 2NO₃^-

iv) Fe(NO₃)₃ reacts with Na₂S

2 Fe(NO₃)₃(aq) + 3 Na₂S(aq) = Fe₂S₃ (S) + 6 NaNO₃(aq)

Net ionic equation :

2 Fe⁺² + 6 NO₃^- + 6 Na⁺ + 3 ​​​​S^-2= Fe₂S₃(s) + 6 NO₃^- + 6 Na⁺