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Analytical Chem 2 > Volumetric Precipitation > Flashcards

Volumetric Precipitation Flashcards

1
Q

Volumetric Precipitation/Precipitimetry

A

Argentometric Method

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2
Q

Formation of INSOLUBLE SUBSTANCES or PRECIPITATES

A

Volumetric precipitation/Argentometric Method

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3
Q

Methods for determination of Endpoint

A
  1. Turbidity Method
    a. Cessation of Precipitation - Gay Lussac
    b. Appearance of Turbidity - Liebig
  2. Use of Internal Indicators
    a. Mohr
    b. Volhard
    c. Fajans
  3. Instrumental Methods
    a. Potentiometry
    b. Amperometric
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4
Q

Gay-Lussac’s Method

A

Direct Titration

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5
Q

Standard in Gay-Lussac Method

A

NaCl

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6
Q

Indicator in Gay-Lussac’s Method

A

None

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7
Q

Gay-Lussac Method Assay

A

Ag with Cl

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8
Q

Volumetric Soln or Titrant in Volumetric precipitation

A

AgNO3 (Silver nitrate)

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9
Q

Standard in Liebig Method

A

NaCl

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10
Q

Indicator in Liebig Method

A

None

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11
Q

Assay of Liebig Method

A

Cyanide

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12
Q

Standard in Modified Liebig (Denige’s)

A

Aq. Ammonia

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13
Q

Indicator in Modified Liebig (Denige’s)

A

KI T.S

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14
Q

Endpoint in Modified Liebig (Denige’s)

A

SIlver Iodide - Yellow ppt

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15
Q

Volhard Precipitation

A

Residual Titration

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16
Q

Standard in Volhard Method

A

Silver Nitrate
Ammonium thiocyanate

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17
Q

Indicator in Volhard Method

A

Ferric Ammonium Sulfate/Ferric Alum

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18
Q

Endpoint in Volhard Method

A

Red color (Ferric thiocyanate)

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19
Q

Assay of Volhard Method

20
Q

Standard in Volhard Method

A

NaCl, Dil. HCl
Silver Nitrate

21
Q

Ammonium thiocyanate VS is a _______, so slight amount in excess of theoretical quantityt required is used in prep of the solution

A

Deliquescent

22
Q

Can be used as an alternative to Ammonium thiocyanate as VS in Volhard Precipitation method

A

Potassium thiocyanate

23
Q

Endpoint of Liebig Method

A

Turbidity - Ag[Ag(CN)2] ppt

24
Q

Use of Nitric Acid in Volhard Method

A

Prevent precipitation of Silver as Carbonate and Phosphate
Prevent hydrolysis of Ferric Alum

25
Advantages of using Nitric Oxide in Volhard
Strongly acidic environment Don't interfer with other ions such as carbonate, oxalate, arsenate
26
Application of Volhard Method
Determination of Halide ions Determination of purity of soluble chlorides or ionic halogens
27
% purity formula for volhard method
% Purity = ((N x V) Ag - (N x V) NH4SCN) x 0.05844 / wt sx * 100
28
Mohr Method
Direct Titration
29
Mohr Method is used for determination of
Cl, Br, CN Neutral and buffered solutions such as drinking water
30
Indicator used in Mohr Method
Potassium chromate ⭐
31
Standard used in Mohr Method
NaCl, Dil HCl
32
Endpoint of Mohr Method
Brick-red ppt (Silver chromate)
33
Mohr Method is used for assay of
NaCl in Na Lauryl sulfate Halides
34
Standard used in Fajan's Method
NaCl
35
Indicator used in Fajan's method
Adsorption Indicator EOSIN Y, DCF, Tetrabromophenolphthalein ethyl ester
36
Fajan's is used for assay of
Halides Iopanoic acid tablets - Contains iodine and is useful as a contrast medium in cholecystography Benzyltrimethylammonium chloride
37
Endpoint of Fajan's
Abrupt change in color halide ppt Pink (?)
38
Fajan's Indicator
Adsorption Indicators
39
Most commonly used indicator
Dicholofluoroscein (DCF)
40
Endpoint of Fajan's if DCF is used
Pink
41
Indicator that is useful in the titration of Br, I, and SCN
Eosin Y (Tetrabromofluorescein)
42
Endpoint of Fajan's if Eosin Y is used
Pink
43
TF: Eosin Y gives sharper endpoint than DCF and more sensitive
True
44
TF: Eosin Y cannot be used for AgCl because it is strongly bound to AgCl than Cl
True
45
Endpoint of Fajan's if Tetrabromophenolphthalein ethylester
Green precipitation

Analytical Chem 2 (17 decks)

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