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Physical Chemistry and Inorganic > All Chemical Tests > Flashcards

All Chemical Tests Flashcards

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1
Q

Test for SO4 2- and positive result?

A
  • Acidify with HCl then add BaCl
  • White precipitate of BaSO4
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2
Q

Test for CO3 2- and positive result?

A

Add dilute HCl
Effervescence = +ve result

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3
Q

Test for OH- and positive result?

A

Damp red litmus paper
Turns from red to blue

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4
Q

Test for Halide ions and positive result for each?

A
  1. Acidify with dilute HNO3
  2. Add AgNO3
  3. Dilute and concentrated NH3
    Cl- = White ppt,dissolves in dilute NH3
    Br- = Cream ppt dissolves in conc NH3
    I- = Yellow ppt, insoluble
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5
Q

Test (‘s) for Mg 2+ ions and positive results?

A

Dilute NaOH- = White precipitate
Dilute H2SO4= No visible change

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6
Q

Test (‘s) for Ca2+ and positive results?

A

Flame test- Brick red
OH- - White ppt
SO42- - Slight white precipitate

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7
Q

Test (‘s) for Sr 2+ and positive results?

A

Flame test- Red
NaOH- No visible change
H2SO4- Slight white precipitate

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8
Q

Test (‘s) for Ba2+ and positive results?

A

Flame test- Green
NaOH- NO visible change
H2SO4- White precipitate

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9
Q

Test for NH4+ and positive result?

A

Add NaOH
Heat sample
Hold damp red litmus paper at test tube mouth

+ve= litmus paper from red to blue

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10
Q

Test for Co 2+ and positive result?

A

Add NH3 drop wise to excess
Pink to blue solution

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11
Q

Tests for Cu 2+ and positive results?

A

Dilute NaOH- Pale blue ppt
Dilute NH3- Pale blue ppt
Conc NH3- Dark blue solution
Na2CO3- Green-blue solution
NaCl- Yellow solution

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12
Q

Tests for Fe 2+ and positive results?

A

Dilute NaOH- Green precipitate
Dilute NH3- Green precipitate
Na2CO3- Green ppt

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13
Q

Test for Fe 3+ and positive results?

A

Dilute NaOH,dilute NH3 and Na2CO3 - Orange-brown ppt
NaCl- Yellow solution

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14
Q

Test for Al3+ and positive result?

A

Dilute NaOH and Dilute NH3 - WHite ppt
XS NaOH- PPt dissolves
Na2CO3- White ppt an effervescence

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15
Q

Test for Alkene and positive result?

A

Share with bromine water
Solution changes from orange to colourless

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16
Q

Test for an alcohol and positive result?

A

Acidified potassium dichromate
Orange to green for primary and secondary alcohols

17
Q

Tests for an Aldehyde and positive results?

A

Warm with fehlings solution- Brick red ppt forms from blue solution
Warm with Tollens reagent- Silver mirror

18
Q

Test for a Carboxylic acid and positive result?

A

Added carbonate
CO2 released (effervescence)

Physical Chemistry and Inorganic (20 decks)

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