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Pharma Analysis I > Volumetric Analysis > Flashcards

Volumetric Analysis Flashcards

1
Q

It is a general term for a method in quantitative chemical analysis in which the amount of a substance is determined by the measurement of the volume that the substance occupies

A

Volumetric analysis

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2
Q

It is commonly used to determine the unknown concentration of known reactant.

A

Volumetric analysis

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3
Q

often referred to as titration

A

Volumetric analysis

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4
Q

a laboratory technique in which one substance of known concentration and volume is used to react with another substance of unknown concentration

A

Titration

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5
Q

Involves the preparations, storage, and measurement of the volume of chemicals for analysis.

A

Volumetric analysis

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6
Q

Quantitative chemical analysis which determines volume of a solution of accurately known concentration required to react quantitatively with the analyte (whose concentration to be determined).

A

Volumetric titrimetry

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7
Q

The volume of titrant required to just completely react with the analyte is the _____

A

titre

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8
Q

A process in which a standard reagent is added to a solution of analyte until the reaction between the two is judged complete.

A

Titration

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9
Q

it is the known solution placed in the burette

A

Titrant

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10
Q

The unknown solution placed in the Erlenmeyer flask

A

Analyte

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11
Q

Where is the analyte placed?

A

Erlenmeyer flask

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12
Q

Where is the titrant placed?

A

Burette

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13
Q

A reagent solution of accurately known concentration

A
  • Standard solution
  • Primary standard
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14
Q

A process to determine the concentration of a solution of known concentration by titrating with a primary standard.

A

Standardization

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15
Q

The point at which the reaction is observed to be completed

A

End point

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16
Q

Serves as a signal that tells the analyst to stop adding reagent and make the final reading of on the burette

A

End point

17
Q

What is the end point referred to?

A

Signal

18
Q

The point at which an equivalent or stoichiometric amount of titrant is added to the analyte based on the stoichiometric equation.

A

Equivalent point

19
Q

What are the equipment used in Volumetric analysis or titration?

A
  • Pipette
  • burette
  • conical flask
  • wash bottles
  • funnel
  • volumetric flasks
20
Q

For measuring accurate and precise volumes of solutions.

A

pipette

21
Q

For mixing two solutions.

A

conical flask

22
Q

For pouring measured volumes of solutions.

A

burette

23
Q

These contain distilled water for cleaning equipment.

A

wash bottles

24
Q

For transfer of liquid without spilling.

A

funnel

25
Q

A flask used to make up accurate volumes for solutions of known concentration.

A

volumetric flasks

26
Q

requirements for successful volumetric titration

A
  • Reaction must be stoichiometric, well defined reaction between titrant and analyte.
  • Reaction should be rapid.
  • Reaction should have no side reaction, no interference from other foreign substances.
  • Must have some indication of end of reaction, such as color change, sudden increase in pH, zero conductivity, etc.
  • Known relationship between endpoint and equivalence point.
26
Q

requirements for successful volumetric titration

A
  • Reaction must be stoichiometric, well defined reaction between titrant and analyte.
  • Reaction should be rapid.
  • Reaction should have no side reaction, no interference from other foreign substances.
  • Must have some indication of end of reaction, such as color change, sudden increase in pH, zero conductivity, etc.
  • Known relationship between endpoint and equivalence point.
27
Q

Is a general term expressing the amount of solute contained in a given material. Expressed by different ways.

A

Concentration

28
Q

The number of moles of solute divided by the number of liters of solution containing the solute (is gram molecular weight dissolved in one liter solution).

A

Molarity

29
Q

Defined as number of equivalents of solute divided by the number of liters of solution containing the solute (gm equivalent weight dissolved in one liter of solution).

A

Normality

30
Q

Is defined as part by wt of substance which is chemically equivalent to one part by wt of hydrogen or 8 part by wt of oxygen or 35*5 part by wt of chlorine.

A

Equivalent weight

31
Q

It depends on reaction in which it takes place.

A

equivalent weight

32
Q

The branch of chemistry which deals with weight relation between reactant and product is called stoichiometry.

A

stoichiometry

33
Q
  • A solution whose concentration is accurately known.
  • Prepared by dissolving an accurately wt quantity of highly pure material called primary standard and diluted to an accurately volume in volumetric flask.
  • Otherwise a solution of approximately desired concentration is titrated against the primary standard solution and concentration is determined, this is called standardization.
A

Standard solution

33
Q
  • Measurements are made with reference to standards.
  • The accuracy of a result is only as good as the quality and accuracy of the standards used.
  • A standard is a reference material whose purity and composition are well known and well defined.
A

Primary standard

33
Q

Primary Standards - Used as titrants or used to standardize titrants

A

Eg. Acid base titration Na2CO3, KHP, Succinic acid, Benzoic acid, Oxalic acid

Eg for redox titration: K2Cr2O7, Potassium bromate, KlO3, Socium Oxilate, arsionus trioxide

Eg for PPT titrations: NaCl, KCl, KBr, Silver nitrate

Eg for Complometric titration: Pure metals like Zn, Mg, Mn, and its salts

34
Q

Cheaprst kind, have not been purified well and cant be used for quantitative work

A

Technical or commercial grade

Pharma Analysis I (9 decks)

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