Dissolution
With MgO & MgS Jing-Hui needs to make a solution using one of these two compounds to produce the most free ions in solution.
Provide the dissolution equation for both salts:
What is ...
MgO(s) -> Mg2+(aq) + O2-(aq)
MgS(s) -> Mg2+(aq) + O2-(aq)
?
Hydrofluoric acid is a weak acid that partially dissociates in water according to the equation below:
HF(aq) + H2O(l) <--> F- + H3O+(aq)
The Ka value is 2.13 x 10-11
What is the pH of a o.920 M solution of HF?
What is pH = 5.35?
60.0 grams of C8H18 is combusted in a solid, empty vessel with a volume of 2.0 liters at a temperature of 50.0°C.
Provide the balanced equation for the combustion of octane.
What is 2C8H18 + 25O2 -> 16CO2 + 18H2O ?
Complete the Lewis Dot Structure for the following compounds. ( C3H8 & C3O2H6 )
What is ... ?
N-Butyl Alchohol (C4OH10) & Diethyl Ether (C4OH10) are constitutional isomers of each other. The Skeletal structures are given below. Complete the Lew Dot structures for the isomers.
What is ... ?
With MgO & MgS Jing-Hui needs to make a solution using one of these two compounds to produce the most free ions in solution.
Which salt will have the highest Ksp?
What is ...
Ksp = [Mg2+][O2-]
Ksp = [Mg2+][S2-]
?
Hydrofluoric acid is a weak acid that partially dissociates in water according to the equation below:
HF(aq) + H2O(l) <--> F- + H3O+(aq)
The Ka value is 2.13 x 10-11
Determine the equation for the Kb of the conjugate base of HF in water.
What is Kb = [OH-][H3O+] ?
60.0 grams of C8H18 is combusted in a solid, empty vessel with a volume of 2.0 liters at a temperature of 50.0°C.
Determine the pressure in reaction vessel assuming all of the octane has completely reacted.
What is 50 atm?
Which of the following molecules will be insoluble in water? ( C3H8 & C3O2H6 )
What is C3H8 because it is nonpolar making it insoluble as water is polar and likes polar?
Using the following bond enthalpies, determine the ΔH°rxn to convert the alcohol to the Ether (C4OH10)
Bond | Enthalpy (kj/mol)
H-C | 413
C-O | 358
C-C | 348
O-H | 463
What is ΔH°rxn = -40 kj ?
With MgO & MgS Jing-Hui needs to make a solution using one of these two compounds to produce the most free ions in solution.
Which salt will be the most soluble? Justify with the concepts of lattice energy and Coulomb's law.
What is...
MgS is most soluble because it has a weaker attraction than MgO. S molecule is bigger than O, and we know that as distance increases, the force of attraction decreases. Therefore MgS is more likely to break into ions than MgO ?
Hydrofluoric acid is a weak acid that partially dissociates in water according to the equation below:
HF(aq) + H2O(l) <--> F- + H3O+(aq)
The Ka value is 2.13 x 10-11
Determine the value for Kb.
What is Kb = 4.69 x 10-4 ?
60.0 grams of C8H18 is combusted in a solid, empty vessel with a volume of 2.0 liters at a temperature of 50.0°C.
Jing-Hui measures the pressure in the vessel after the reaction is complete and determines it is only 18.1 atm. What is the percent yield of CO2?
What is 36.2% CO2 ?
For the first molecule ( C3H8 ), what is the molecule geometry for the second carbon? ( C3O2H6 )
What is a tetrahedral? With a 109.5° because there are 4 domains attached to it.
Is the reaction endothermic or exothermic?
Bond | Enthalpy (kj/mol)
H-C | 413
C-O | 358
C-C | 348
O-H | 463
What is exothermic ?
What is the Ksp equation?
What is
Ksp = [A+]a [B-]b
?
What is the Kw equation?
What is Kw = 1.0 x 10-14 = Ka x Kb ?
60.0 grams of C8H18 is combusted in a solid, empty vessel with a volume of 2.0 liters at a temperature of 50.0°C.
If the pressure from the CO2 is only 18.1 atm, how many grams of octane did not react?
What is 156.18 g C8H18 ?
What hybridization does each C atom have in the first molecule ( C3H8 ) ?
& Describe the bond angle for the 2nd molecule's C-O-H. ( C3O2H6 )
What is sp3 ?
& What is less than less than 109.5° because there are four things attached to it ?
Which of the isomers has stronger intermolecular forces?
What is N-Butyl Alcohol, there is Hydrogen bonding in alcohol with Dipole-Dipole & LDF, Diethyl Ether only has Dipole-Dipole & LDF ?
What does Ksp mean?
What is solubility equilibrium?
Hydrofluoric acid is a weak acid that partially dissociates in water according to the equation below:
HF(aq) + H2O(l) <--> F- + H3O+(aq)
The Ka value is 2.13 x 10-11
What is the Ka equation for this question with a 0.920 M solution of HF?
What is Ka = [H+][A-] / [0.920]
Why is it a mistake to not take into account the drop in temperature of the reaction vessel when cooling the H2O vapor and condensing it into a liquid?
What is a drop in temperature causes H2O vapor to form into a liquid due to an increased attraction of IMFs?
Of the two molecules, which will have the highest boiling point? Justify your answer by using concepts of intermolecular forces.
C3O2H6 because it has hydrogen bonding, dipole-dipole, & London dispersion forces while C3H8 only had LDFs making it weaker & having a lower boiling point.
If entropy is negative, determine the sign of ΔG at a constant temperature.
What is ΔG is conditional ?