Chapter 6 Flashcards Preview

Analytical > Chapter 6 > Flashcards

Flashcards in Chapter 6 Deck (29):
1

A rxn is favored when K is _______ 1.

>

2

Concentrations of solutes should be expressed as _________.

Molarity (mol/L)

3

Concentrations of pure solids, pure liquids, and solvents are omitted because they are _______. They do not participate in the equilibrium.

Unity

4

What are the 4 main solubility rules? (solubility rules)

1. NO3- (soluble)

2. Na+, K+, NH4+ (soluble)

3. Cl- (soluble)---------> except AgCl, PbCl2, Hg2Cl2

4. SO4^2- (soluble)--> except BaSo4, PbSO4, CaSO4

5

What is the new value of K if a rxn is reversed?

1/K

6

_____ _____ for a rxn is the heat absorbed or released when the reaction takes place under constant applied pressure.

Enthalpy change

7

For a rxn which (delta H) is positive is said to
be _________.

Endothermic

8

For a rxn in which (delta H) is negative is said to
be _______

Exothermic

9

When a chemical or physical change occurs in a reversible manner at a constant temperature, the ______ ______ ,
is equal to the heat absorbed divided by the temperature.

Entropy change

10

The change in ____________ is the arbiter between opposing tendencies of H and S.

Gibbs free energy

11

What is the equation for Gibbs free energy?

G= H - T S

12

A rxn is favored (proceeds) when delta G is _________.

negative

13

If K>Q then the rxn favors the ___________.

products

14

If K

reactants

15

If K=Q than the rxn is said to be __________.

@ Equilibrium

16

__________ ________ is the equilibrium constant for the rxn in which a solid salt dissolves to give its constituent ions in solution.

Solubility product

17

A ________ solution is one that contains excess undissolved solid.

saturated

18

A salt will be ______ soluble if one of its constituent ions is already present in the solution and this is called _______ ___ _______.

less

common ion effect

19

The increased solubility arises from the formation of _________.

Complex ions

20

The _________ makes a salt less soluble and _______ make salts more soluble.

common ion effect

complex ions

21

__________ consist of two or more simple ions bonded to one another.

Complex ions

22

A _______ is any atom or group of atoms attached to the species of interest.

ligand

23

A ___________ acid accepts a pair of *electrons* from a ___________ base.

Lewis
Lewis

24

The product of the rxn between a Lewis acid and Lewis base is known as an _______.

adduct

25

In the molecules PbI+, PbI3-, and PbI4^2-, iodine is said to be the ________ of Pb2+.

ligand (donates e-)

26

_______ and _______ classified acids as proton donors and bases as proton acceptors.

Bronsted and Lowry

27

How does Bronsted and Lowry classify acids compared to Lewis?

Bronsted/Lowry ---> Protons

Lewis-----> electrons

28

When a proton is transferred from one molecule to another molecule of a protic solvent, the rxn is called __________.

Autoprotolysis

29

What are the 7 strong acids?

1. HI
2. HBr
3. HCl
4. HClO3
5. HClO4
6. H2SO4
7. HNO3