Name: CHM-111 General Chemistry I Problem Set- Chang. Chapter 4A Spring 2018 Dat

Question

Name: CHM-111 General Chemistry I Problem Set- Chang. Chapter 4A Spring 2018 Date Which of the following species are present in an aqueous solution of NaliCo, a weak electrolyte? B) Na", ???, D) NaHCO, Na", HCO, 2. Write the molecular reaction, the complete ionic reaction and the net ionic reaction that describe the outcome of mixing equal volumes of aqueous solutions of 0.10 M lead (I1) nitrate and 0.10 M potassium iodide. 3. Write the balanced reaction for the neutralization of nitric acid with calcium hydroxide. 4. Determine the oxidation numbers for each of the indicated elements in the following molecular species: A) N in NO2 B) Cl in CIO C) P in P2Os D) O in H-O E) Fe in Fe(CN6

Explanation / Answer

2)
Pb(NO3)2(aq) + 2 KI(aq) --------- PbI2(s) + 2 KNO3(aq)

Pb+2(aq) + 2 NO3-(aq) + 2 K+(aq) + 2 I-(aq) --------- PbI2(s)+ 2K+(aq)+ 2 I-(aq)

Pb+2(aq) + 2 I-(aq) ----- PbI2(s)

3)
2 HNO3(aq) + Ca(OH)2(aq) ------ Ca(NO3)2(aq) + 2 H2O(l)

4)
NO2-
oxidation state of oxygen= -2
x+2(-2)=-1
x= +3
Oxidation state of Nitrogen= +3
B)
ClO4-
x+4(-2)=-1
x=+7
oxidation state of Cl= +7
C)
P2O5
2x+5(-2) =0
2x=+10
x=+5
oxidation state of P=+5
D)
H2O2
the structure of H2O2 is H-O-O-H
In this strcuture peroxy bond is present
Peroxy bond is the oxygen-oxygen containing a single bond. In
peroxides the oxidation state of Oxygenis -1.

E)
Fe(CN)6-3
the charge of CN group = -1
x+6(-1)=-3
x= +3

7)

Cu(s) + H2SO4(aq) -------------- CuSO4(aq) + H2(g)

0          +1                             +2                 0

the oxidation state of Hydrogen decreases from +1 to 0.

The oxidation state of an atom is decreases is called as reduction,

So the redox reaction is

H2SO4 ------- H2

8) The answer is C

Fe2O3(s) + 2Al(s) --------- 2Fe (s) + Al2O3(s)

In this reaction the metal Fe is displaced from their oxide with Al.

9) HCOOH(aq) ------------ H+(aq)   + HCOO-(aq)

HCOOH is a weak acid.

The dissociation of formic acid is weak acid

The answer is C

The remaining question are not clearly visible

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