Module 4

Question 1

It is the equilibrium constant for the equilibrium that exists between a solid ionic solute and its ions in a saturated aqueous solution

Answer 1

Ksp

Question 2

The solubility of an ionic precipitate decreases when a soluble compound containing one of the ions of the precipitate is added to the solution. This behavior is called

Answer 2

common-ion effect

Question 3

is a technique often used to analyze substances in our daily lives even if we are unaware of it.

Answer 3

Gravimetric Analysis

Question 4

the analyte is separated from
a solution of the sample as a precipitate and
is converted to a compound of known
composition that can be weighed.

Answer 4

precipitation

Question 5

the analyte is separated from
other constituents of a sample by
conversion to a gas of known chemical
composition. The weight of this gas then
serves as a measure of the analyte
concentration.

Answer 5

volatilization

Question 6

the analyte is separated by
deposition on an electrode by an electrical
current. The mass of this product then
provides a measure of the analyte
concentration.

Answer 6

electrogravimetry

Question 7

the mass of the reagent, of
known concentration, required to react
completely with the analyte provides the
information needed to determine the analyte
concentration.

Answer 7

gravimetric titremitry

Question 8

uses a mass spectrometer to
separate gaseous ions formed from the
elements making up a sample of matter. The
concentration of the resulting ions is then
determined by measuring the electrical
current produced when they fall on the
surface of an ion detector.

Answer 8

mass spectrometry

Question 9

Experimental variables that affect the particle size of precipitates:

Answer 9

1. Solubility
2. Temperature
3. Reactant concentrations
4. Rate at which reactants are mixed

Question 10

solution is an unstable
solution that contains a higher solute
concentration than a saturated solution. With
time, this solution is relieved by precipitation of
the excess solute.

Answer 10

supersaturated

Question 11

is a process in which a minimum
number of atoms, ions or molecules join
together to give a stable solid.

Answer 11

nucleation

Question 12

is a process in which a
substance (gas, solid or liquid) is held on the
surface of a solid.

Answer 12

adsorption

Question 13

involves retention of a substance within the pores of a solid.

Answer 13

suspension

Question 14

are tiny particles are invisible to the naked eye
and show no tendency to settle from solution,
nor are they easily filtered.

Answer 14

colloidal suspension

Question 15

temporary dispersion of particles in a liquid phase; particles tend to settle sponstaneously and are readily filtered.

Answer 15

crystalline suspension

Question 16

made up of fine particles that have not grown together to form an extensive lattice structure.

Answer 16

curdy suspension

Question 17

much larger in number and of much smaller dimension than those of crystalline precipitate where a large quantity of water is adsorbed

Answer 17

gelatinous precipitate

Question 18

is a process by which a coagulated colloid returns to its dispersed state.

Answer 18

peptization

Question 19

is a process in which a precipitate is heated for an hour or more in the solution from which it was formed (the mother liquor).

Answer 19

digestion

Question 20

is the solution from which precipitate was formed.

Answer 20

mother liquor

Question 21

is a process in which normally soluble compounds are carried out of solution by a precipitate

Answer 21

Coprecipitation