3. Write down the complete molecular equations for each of the above reactions.

Question

3. Write down the complete molecular equations for each of the above reactions. CIRCLE the precipitate (if any), and put a SQUARE BOX around the gas (if any). Then balance the equations. (NOTE: For Rxn 2, write the product H COs as H:0 and CO) )3 as H2O and CO Rxn Reactants (if any) Identify type of reaction (precipitation, redox, acid-base, or gas evolution) 1 | BaCl2 + Naso, … > aco 2 HCI + CaCO .2 4. Using your answers above, (i) write down the full ionic equation, then (ii) write down the net ionic equation. Rxn Reactions (if any)

Explanation / Answer

3)

BaCl2(aq) + Na2SO4(aq) -------------- BaSo4(s) + 2 NaCl(aq)

This is precipitation reaction

2 HCl(aq) + CaCO3(s) ---------------- CaCl2(aq) + CO2(g) + H2O(l)

This is gas evolution reaction

4)

a)   BaCl2(aq) + Na2SO4(aq) -------------- BaSo4(s) + 2 NaCl(aq)

   Ba+2(aq) + 2Cl-(aq) + 2 Na+(aq) + SO4-2(aq) --------------- BaSO4(s) + 2 Na+(aq) + 2 Cl-(aq)

Ba+2(aq) + SO4-2(aq) ---------------- BaSo4(s)

b) 2 HCl(aq) + CaCO3(s) ---------------- CaCl2(aq) + CO2(g) + H2O(l)

2 H+(aq) + 2 Cl-(aq) + CaCO3(s) ------------ Ca+2(aq) + 2 Cl-(aq) + CO2(g) + H2O(l)

2 H+(aq) + CaCO3(s) ---------------- Ca+2(aq) + CO2(g) + H2O(l)

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