A.Write a balanced molecular equation and a net ionic equation for the following

Question

A.Write a balanced molecular equation and a net ionic equation for the following reactions: (4 points)

a. A solution of sulfuric acid (H2SO4) reacts with solid sodium carbonate Na2CO3.

Molecular:

Net ionic:

b. A solution of calcium hydroxide (Ca(OH)2 reacts with a solution of nitric acid (HNO3).

Molecular:

Net ionic:

B.Ten milliliters of a 5 × 10–3M solution of Cl– ions is reacted with a 0.500 M solution of AgNO3. What is the maximum mass of AgCl that precipitates? (2 points)

C.In sediments and waterlogged soil, dissolved O2 concentrations are so low that the microorganisms living there must rely on other sources of oxygen for respiration. Some bacteria can extract the oxygen from sulfate ions, reducing the sulfur in them to hydrogen sulfide gas and giving the sediments or soil a distinctive rotten-egg odor.

                        SO42- (aq)          H2S (g)

What is the change in oxidation state of sulfur as a result of this reaction? (2 points)

Write the balanced net ionic equation for the reaction under acidic conditions that releases O2 from sulfate and forms hydrogen sulfide gas. (2 points)

Explanation / Answer

H2SO4 (aq) + Na2CO3(aq)-------> Na2SO4 (aq) + Co2(g) +H2O(l)

2H+(aq) +SO42- (aq) + 2Na+(aq) +CO32-(aq)-------> 2Na+(aq) +SO42- (aq) + Co2(g) +H2O(l)

2H+(aq) +CO32-(aq)------->   Co2(g) +H2O(l) net ionic equation

Ca(OH)2(aq) + 2HNO3(aq)--------> Ca(NO3)2(aq) + 2H2O(l)

Ca+2(aq)+2OH-(aq) + 2H+(aq) +2NO3-(aq)--------> Ca+2(aq)+2NO3-(aq) + 2H2O(l)

2OH-(aq) + 2H+(aq) --------> 2H2O(l) net ionic equation

no of moles of Cl-   = molarity * volume in L

                              = 5*10-3 *0.01 = 0.00005 moles

Cl- + AgNO3 ------> AgCl(s) + NO3-

1 mole of Cl- react with AgNo3 to gives 1 mole of AgCl

0.00005 moles of Cl- react with AgNO3 to gives 0.00005 moles of AgCl

mass of AgCl = no of moles * gram molar mass

                      = 0.00005*143.32 = 0.007166g

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