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chem prac Flashcards

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1
Q

testing Al3+

A

NaOH, white precipitate formed, dissolves excess form colourless

NH4, white precipitate formed, insoluble excess

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2
Q

testing Zn2+

A

NaOH, white precipitate formed, dissolves excess form colourless

NH4, white precipitate formed, dissolves excess form colourless

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3
Q

testing Ca2+

A

NaOH, white precipitate formed, insoluble excess

NH3, No precipitate forms, excess no VISIBLE change is observed

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4
Q

testing NH4+

A

NaOH, no precipitate formed colourless, on warming - colourless pungent gas which turns litmus blue

NH4+ nil

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5
Q

testing Cu2+

A

NaOH, light blue precipitate formed, insoluble excess

NH4+, light blue precipitate formed, dissolves in excess form dark blue solution

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6
Q

testing Fe2+

A

NaOH, green precipitate formed which turns brown on standing (oxidised in air), insoluble in excess

NH4+, green precipitate and same

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7
Q

testing Fe3+

A

NaOH, reddish brown insoluble in excess
NH4+, same

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8
Q

how to test for CO3 2-

A

Steps:
* add dilute acid
* bubble gas formed into limewater

Observation:
* upon adding acid, effervesence and odourless gas
* turns moist litmus paper red
* white precipitate (is co2) is formed when the gas is bubbled

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9
Q

how to test for Cl-

A

Steps:
* add nitric acid
* then add silver nitrate

Observations:
* white ppt formed (silver chloride, AgCl)
* white ppt insoluble in nitric scid

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10
Q

how to test for I- / iodide

A

Steps:
* add nitric acid
* then silver nitrate

Observations:
* pale yellow ppt formed (AgI)

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11
Q

how to test for nitrate NO3-

A

Steps:
* add NaOH
* add aluminium foil inside
* warm gentyl

Observations:
* effervesence of colourless pungent gas
* moist litmus turns blue
* gas ammonia

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12
Q

how to test for SO4 2-

A

Steps:
* add nitric acid
* then barium nitrate

Observations:
* white precipitate (barium sulfate) forms

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13
Q

rva

testing hydrogen

A

light splint with sound pop

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14
Q

testing oxygen

A

glowing splint grows bigger (fire)

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15
Q

t

testing SO4 2-

A

place filter paper at mouth of tube, if turn orange potassium dichromate green, if turn purple potassium manganate colourless

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15
Q

testing NH3+

A

warm + litmus paper turns blue

16
Q

testing Cl2

A

Blue litmus paper turn red then bleached

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