Module 4 Intro
1. Module 4 Intro
1.23. Page 6
Module 4—Properties of Solutions
Self-Check
SC 8. For each of the following substances, state whether it has high or low solubility and list the major entities present when placed in water. The first row is done for you.
Substance to Be Placed in Water |
Solubility |
Major Entities Present |
Ag |
low |
Ag(s), H2O(l) |
SrCl2 |
|
|
HCl |
|
|
HNO3 |
|
|
(NH4)2HPO4 |
|
|
C8H18 |
|
|
NH4NO3 |
|
|
Au(OH)3 |
|
|
CH4 |
|
|
O2 |
|
|
CaCO3 |
|
|
Ag2SO4 |
|
|
MgCl2 |
|
|
CH3OH |
|
|
HF |
|
|
SC 9. Each of the following substances was on the table in question 1. Explain how to predict the major entities present.
- C8H18
- O2
- CH4
- C2H5OH
SC 10. Complete the dissociation equations for each of the following substances in water. Make sure you balance the equation.
- Na2SO4(s) →
- HF(g) →
- Au(OH)3(s) →
- C6H12O6(s) →
- Zn(s) →
- Al2(SO4)3(s) →
- N2(g) →
Self-Check Answers
SC 8.
Substance to Be Placed in Water |
Solubility |
Major Entities Present |
Ag |
low |
Ag(s), H2O(l) |
SrCl2 |
high |
Sr2+(aq), Cl–(aq), H2O(l) |
HCl |
high |
H+(aq), Cl–(aq), H2O(l) |
HNO3 |
high |
H+(aq), NO3–(aq), H2O(l) |
(NH4)2HPO4 |
high |
NH4+(aq), HPO42–(aq), H2O(l) |
C8H18 |
low |
C8H18(l), H2O(l) |
NH4NO3 |
high |
NH4+(aq), NO3–(aq), H2O(l) |
Au(OH)3 |
low |
Au(OH)3(s), H2O(l) |
CH4 |
low |
CH4(g), H2O(l) |
O2 |
low |
O2(g), H2O(l) |
CaCO3 |
low |
CaCO3(s), H2O(l) |
Ag2SO4 |
low |
Ag2SO4(s), H2O(l) |
MgCl2 |
high |
Mg2+(aq), Cl–(aq), H2O(l) |
CH3OH |
high |
CH3OH(aq), H2O(l) |
HF |
high |
H+(aq), F–(aq), H2O(l) |
SC 9.
- This is liquid octane, a nonpolar molecular substance. It will not dissolve in water.
- Elemental gases have low solubility in water and keep their original state.
- Methane is a nonpolar molecule that will not dissolve in water.
- Ethanol is a polar molecule that will dissolve in water.
SC 10.
- Na2SO4(s) → 2 Na+(aq) + SO42–(aq)
- HF(g) → H+(aq) + F–(aq)
- Au(OH)3(s) → Au3+(aq) + 3 OH–(aq)
- C6H12O6(s) → C6H12O6(aq)
- Zn(s) → Zn(s)
- Al2(SO4)3(s)→ 2 Al3+(aq) + 3 SO42–(aq)
- N2(g)→ N2(g)