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Chemistry > Qualitative Tests > Flashcards

Qualitative Tests Flashcards

1
Q

How do you test for CO2?

A

Pass thru limewater

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2
Q

What is a pos result for CO2?

A

Colourless to milky

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3
Q

What indicates CO2 in XS?

A

Milky white ppt is sol and forms colourless solution

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4
Q

How do you test for H2? and Positive Result:

A

Burning splint into a sample of gas
Burns with a pop

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5
Q

How do you test for 02?

A

Put glowing splint into the sample of gas
Splint relights

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6
Q

How do you test for Cl2?

A

Damp litmus/ universal ind paper
Bleaches

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7
Q

How do you test for NH3?

A

Damp universal ind paper, then glass rod dipped in conc HCl acid.
Pos: turns blue and dense white flame

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8
Q

How do you test for HCl?

A

Damp universal indicator, glass rod dipped in conc NH3 sol
Pos: Turns reed and dense white flames

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9
Q

How do you dissolve a sol in h20?

A

Add a few spatula measures to a tt of deionised water and shake to mix
If it dissolves to form a col sol- Gr1/2/ammonium ion/ Zn/Al compound

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10
Q

How do you carry out a flame test?

A

Dip nichrome wire loop in conc Hcl acid, touch sample with wire, then hold it in Blue Bunsen flame

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11
Q

What is the colour of Li+?

A

Crimson

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12
Q

Na+

A

Yellow/orange

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13
Q

K+

A

Lilac

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14
Q

Ca2+

A

Brick Red

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15
Q

Ba2+

A

Green

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16
Q

Cu2+

A

Blue-Green

17
Q

How do you test for the presence of halide ions?

A

Dissolve a spatula measure of solid sample in dilute HNO3 and add a few cm3 AgNO3 sol
Add dilute/ conc NH3 sol

18
Q

What are the obs if Cl- present?

A

White ppt (AgCl) sol in both dilute and conc NH3 sol-> col. sol

19
Q

What are the obs if Br- present?

A

Cream ppt (AgBr) - not sol. in dilute NH3 but sol in conc NH3 sol -> col. sol.

20
Q

What are the obs if I- present?

A

Yellow ppt not sol. in either dilute/ conc NH3 sol.

21
Q

How do you test for SO2-4 ions?

A

Dissolve spatula measure of s sample in dilute HNO3 acid (HCl acid also works) and add a few cm3 BaCl2
White ppt ( BaSO4) means present

22
Q

How do you test for Carbonate Ions?

A

Place a few cm3 dilute acid in t.t and add a spatula measure of solid sample

23
Q

What are the obs if CO2-3 ions are present?

A

Effervescence
S disappears
Gas evolved can be passed thru limewater in another t.t using a delivery tube
Limewater: colourless -> milky

24
Q

How do you test for NH+4?

A

Place a few cm3 NaOH sol in tt and add spatula measure of a sample- warm gently
Test any gas evolved using damp red litmus paper/ glass rod dipped in conc HCl acid

25
Q

What are the obs if NH+4 present?

A

Pungent gas
Damp ind changes to blue
White smoke with glass rod dipped in conc HCl acid

26
Q

How do you test for starch sol?

A

Add a few cm3 starch sol to a sample

27
Q

What happens if starch present/ not present?

A

Present: Blue-Black
Not Present: No blue-black- remains yellow-brown

Chemistry (9 decks)

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