Ana Chem Midterms Flashcards

1
Q

the analyte is
converted to a soluble precipitate.

A

Precipitation method

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2
Q

the analyte or its
decomposition products are volatilized at a
suitable temperature

A

Volatilization method

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3
Q

gravimetric precipitating agent
should react

A

Specifically

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4
Q

Sumarry of steos in precipitation gravimetry

A

precipitation
Digestion
Filtration
Drying

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5
Q

Precipitates made up of___ particles are
generally desirable in gravimetric work

A

Large

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6
Q

solid made up of particles having
diameters that are less than 10-4 cm.

A

Colloid

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7
Q

Coagulation can be hastened by ——,——,—-

A

Heating, stirring and ading electrilytes

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8
Q

Larger particles can also be obtained by

A

Ph control

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9
Q

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

A

aDsorption

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10
Q

Coagulation of a colloidal suspension can often be
brought about by

A

short period of heating and stirring

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11
Q

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

A

Peptization

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12
Q

Colloids are best precipitated from hot, stirred
solutions containing sufficient electrolyte to
ensure coagulation

A

True

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13
Q

four types of coprecipitation

A

Surface adsorption, mixed crystal formation, occlusion, and mechanical entrapmnt

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14
Q

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

A

Coprecipitation

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15
Q

common source of coprecipitation

A

Adsorption

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16
Q

Minimizing Adsorbed Impurities on Colloids

A

Surface adsorption

17
Q

A drastic but effective way to minimize the effects of adsorption

A

Reprecipitation

18
Q

one of the ions in the
crystal lattice of a solid is replaced by an ion of
another element.

A

Mixed crystal formation

19
Q

is a type of coprecipitation in which a
compound is trapped within a pocket formed
during rapid crystal growth.

A

Occulusion

20
Q

is a process in
which a precipitate is formed by SLOW
generation of a precipitating reagent
homogeneously throughout a solution.

A

homogeneous precipitation

21
Q

New compound is often called ad

A

Weighing form

22
Q

Recording thermal decomposition curves
isoften called

A

Thermogravimetry

23
Q

includes a group of analytical
methods based on determining the quantity
of a reagent of known concentration that is
required to react completely with the analyte.

A

Titrimetry

24
Q

type of titrimetry in
which the standard reagent is measured
volumetrically

A

Volumetric titrimetry

25
Q

is a type of titrimetry in
which the quantity of charge in coulombs
required to complete a reaction with the
analyte is measured

A

Coulometric titrimetry

26
Q

is a reagent of known
concentration

A

Standard solution

27
Q

process in which a standard
reagent is added to a solution of an analyte
until the reaction between the analyte and
reagent is judged to be complete

A

Titration

28
Q

is a process in which the excess
of a standard solution used to consume an
analyte is determined by titration with a
second standard solution.

A

Back titration

29
Q

important observations are
confined to a small region (typically ± 0.1 to
± 0.5 mL) surrounding the equivalence point.

A

Sigmoidal Curve

30
Q

measurements are
made on both sides of but well away from the
equivalence point. Measurements near
equivalence are avoided.

A

Linear segment curve

31
Q

a reagent of known
concentration that is used in a titrimetric
analysis.

A

Standard Solution

32
Q

a process in which a standard
reagent is added to a solution of an analyte
until the reaction between the analyte and
reagent is judged to be complete.

A

Titration

33
Q

the point in a titration
when the amount of added standard reagent is
equivalent to the amount of analyte.

A

Equivalence Titration

34
Q

the point in a titration when a
physical change occurs that is associated with
the condition of chemical equivalence.

A

End Point

35
Q

often added to the analyte
solution to give an observable physical change
(the end point) at or near the equivalence
point

A

Indicator

36
Q

highly purified
compound that serves as a reference material
in all volumetric and mass titrimetric
methods.

A

primary standard

37
Q

a compound whose
purity has been established by chemical
analysis and that serves as the reference
material for a titrimetric method of analysis.

A

Secondary Standard

38
Q

Two basic methods are used to establish the
concentration of such solutions.

A

Direct Method and Standardization