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ANACHEM Lec > Unit 7 – Volumetric Titrimetry > Flashcards

Unit 7 – Volumetric Titrimetry Flashcards

1
Q

These include analytical methods that based on determining the amount of reagent of known strength that required completely with the analyte.

A

Titrimetric Method

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2
Q

What are the types of Titrimetry?

A

Volumetric T.
Gravimetric T.
Coulometric T.

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3
Q

The standard reagent called TITRANT is measured VOLUMETRICALLY.

A

Volumetric T.

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4
Q

The MASS of standard reagent called TITRANT is measured.

A

Gravimetric T.

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5
Q

The quantity of a CONSTANT, DIRECT ELECTRICAL CURRENT of known magnitude is measured.

A

Coulometric T.

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6
Q

The chemical component in the sample that is to be determined.

A

Analyte

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7
Q

Solution that is usually placed in the buret quantitatively reacts with the analyte.

A

Titrant

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8
Q

Solution that is usually placed in the buret quantitatively reacts with the analyte.

A

Titrant

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9
Q

Compound of interest in the sample.

A

Analyte

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10
Q

A reagent of KNOWN CONCENTRATION.

A

Standard solution

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11
Q

It is based on the reaction between the analyte and the titrant.

A

Titration

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12
Q

It is a process of measuring the volume of a solution (of known concentration) that is needed to react completely with the analyte.

A

Titration

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13
Q

T/F
Volume of a solution is the standard solution that will react to the analyte.

A

T

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14
Q

THEORETICAL POINT in titration when the amount of titrant is chemically equivalent to the amount of analyte in the sample.

A

Equivalence point

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15
Q

EXPERIMENTAL ESTIMATION of equivalence point.

A

Endpoint

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16
Q

Point in titration when a physical change occurs at or NEAR the equivalence point.

A

Endpoint

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17
Q

The difference in volume or mass between the equivalence point and end point.

A

Titration error

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18
Q

Substance that undergoes an observable change when endpoint of a titration is reached.

A

Indicator

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19
Q

This will react to excess amount of titrant.

A

Indicator

20
Q

Successful titrations are based on reactions that are _____, _____.

A

Stoichiometric, quantitative and fast

21
Q

T/F
Titrant must be STABLE, of known concentration (standard solution) and SELECTIVELY reacts with the analyte.

A

T

22
Q

T/F
Standard solution is a solution of known concentration.

A

T

23
Q

T/F
Standard solution should be sufficiently stable.

A

T

24
Q

T/F
Standard solutions reacts RAPIDLY and COMPLETELY with the analyte.

A

T

25
Q

T/F
Standard solution undergo SELECTIVE REACTION with the analyte.

A

T

26
Q

T/F
The standard solution should react ONLY to the analyte of interest.

A

T

27
Q

It is the process of determining the exact concentration of the solution.

A

Standardization

28
Q

T/F
In preparation of PRIMARY STANDARD SOLUTION, you should standardize using weighed quantity of primary standard.

A

T

29
Q

It is HIGHLY PURIFIED compound that serves as reference material for titrimetric analysis.

A

Primary standard

30
Q

It is made by weighing a pure solid and dissolving it in to make a solution.

A

Primary standard

31
Q

What are the requirements for primary standard?

A
  • High purity – preferably 99.9% or better
  • Atmospheric stability
  • Absence of hydrate water
  • Available at modest cost
  • Soluble in titration medium
  • Has large molar mass to minimize relative error associated with weighing
32
Q

Give at least one example of PRIMARY STANDARD SOLUTION.

A

Potassium Acid Phthalate (KHP)
Benzoic Acid
Arsenious Oxide
Sodium Oxalate

33
Q

A solution that is standardized against another standard solution.

A

Secondary standard solution

34
Q

A solution in which the concentration of dissolved solute has solute has not been determined from the weight of the compound dissolved but by reaction (titration) of a volume of the solution against a measured volume of a primary standard solution.

A

Secondary standard solution

35
Q

Give at least one example of SECONDARY STANDARD SOLUTION.

A

NaOH
HCl
KMnO4

36
Q

T/F
Endpoints of titrations must occur at or near equivalence point.

A

T

37
Q

What are the typical indicator change in titration?

A
  • Appearance or disappearance of a COLOR
  • Change in color
  • Appearance or disappearance of TURBIDITY
38
Q

Which of the following is/are based on the reaction involved between ANALYTE and TITRANT?

A. Acid-base or neutralization titration
B. Precipitation titration
C. Complexation titration
D. Oxidation-reduction titration
E. All of the above

A

E

39
Q

Which of the following is/are based on how the amount of analyte is determined?

A. Direct titration method
B. Replacement or Indirect titration method
C. Back-titration
D. All of the above

A

D

40
Q

A method wherein the titrant DIRECTLY reacts with the analyte.

A

Direct titration method

41
Q

T/F
Reaction ratio depends on the balanced chemical reaction.

A

T

42
Q

T/F
The amount of analyte/titrant is expressed in units of moles or millimoles.

A

T

43
Q

The analyte is CONVERTED to ANOTHER substance by a preliminary reaction.

A

Replacement or Indirect titration method

44
Q

In replacement or indirect titration method, the new substance (X) is _____ proportional to the amount of _____. This new substance is then determined by _____.

A. directly; analyte; titration
B. inversely; analyte; titration
C. directly; titrant; analyte
D. inversely; titrant; analyte

A

A

45
Q

The analyte is made to react with a known amount of excess standard solution (titrant1). The excess reagent is titrated with a second standard solution (titrant2).

A

Back-titration method

ANACHEM Lec (3 decks)

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