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O Level Chemistry > Quantatative Analysis > Flashcards

Quantatative Analysis Flashcards

1
Q

When added sodium hydroxide:
White ppt is formed. White ppt dissolves in excess NaOH to produce a colourless solution.
When added aqueous ammonia:
White ppt is formed. White ppt is insoluble in excess aqueous NH3.

What cation is present?

A

Al 3+ or Pb 2+

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2
Q

When added sodium hydroxide:
White ppt is formed. White ppt is insoluble in excess NaOH.
When added aqueous ammonia:
No reaction takes place

What cation is present?

A

Ca 2+

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3
Q

When added sodium hydroxide:
Blue ppt is formed. Blue ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Blue ppt is formed. Blue ppt dissolves in excess aqueous NH3 to produce a dark blue solution.

What cation is present?

A

Cu 2+

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4
Q

When added sodium hydroxide:
Green ppt is formed. Green ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Green ppt is formed. Green ppt is insoluble in excess aqueous NH3.

What cation is present?

A

Fe 2+

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5
Q

When added sodium hydroxide:
Reddish-brown ppt is formed. Reddish-brown ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Reddish-brown ppt is formed. Reddish-brown ppt is insoluble in excess aqueous NH3.

What cation is present?

A

Fe 3+ (Think about rust, rust is actually oxidised fe2+. It is reddish-brown colour. Thus, it should be fe3+)

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6
Q

When added sodium hydroxide:
White ppt is formed. White ppt dissolves in excess NaOH to produce a colourless solution.
When added aqueous ammonia:
White ppt is formed. White ppt dissolves in excess aqueous NH3 to form a colourless solution.

What cation is present?

A

Zn 2+

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7
Q

When added sodium hydroxide:
No ppt formed
When added aqueous ammonia:
No ppt formed
Upon heating:
Effervescence of colourless and pungent gas observed.
What cation is present?

A

NH 4+

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8
Q

Add dilute HCl, effervescence of colourless and odourless gas observed. Gas turns calcium hydroxide into a white ppt.

What anion is present? / What gas is given off?

A

CO3 2- (carbonate)

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9
Q

Add dilute HNO3 then add AgNO3 solution. A white ppt is formed.
What anion is present?

A

Cl - (Chloride)

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10
Q

Add dilute HNO3, then add silver nitrate solution. Yellow ppt formed.
What anion is present?

A

I - (Iodide)

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11
Q

Add dilute HNO3, then add a piece of aluminium foil. Warm the mixture. Efferverscence of colourless and pungent gas. No ppt is observed. Gas turns moist red litmus paper blue.
What anion is present?

A

NO 3- (Nitrate)

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12
Q

Add dilute HNO3, then add aqueous Ba(NO3)2. White ppt formed.
What anion is present?

A

SO4 2- (Sulfate)

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13
Q

How to test for Al 3+ or Pb 2+

A

When added sodium hydroxide:
White ppt is formed. White ppt dissolves in excess NaOH to produce a colourless solution.
When added aqueous ammonia:
White ppt is formed. White ppt is insoluble in excess aqueous NH3.

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14
Q

How to test for Ca 2+

A

When added sodium hydroxide:
White ppt is formed. White ppt is insoluble in excess NaOH.
When added aqueous ammonia:
No reaction takes place

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15
Q

How to test for Cu 2+

A

When added sodium hydroxide:
Blue ppt is formed. Blue ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Blue ppt is formed. Blue ppt dissolves in excess aqueous NH3 to produce a dark blue solution.

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16
Q

How to test for Fe 2+

A

When added sodium hydroxide:
Green ppt is formed. Green ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Green ppt is formed. Green ppt is insoluble in excess aqueous NH3.

17
Q

How to test for Fe 3+

A

When added sodium hydroxide:
Reddish-brown ppt is formed. Reddish-brown ppt is insoluble in excess NaOH.
When added aqueous ammonia:
Reddish-brown ppt is formed. Reddish-brown ppt is insoluble in excess aqueous NH3.

(Think about rust, rust is actually oxidised fe2+. It is reddish-brown colour. Thus, it should be fe3+)

18
Q

How to test for Zn 2+

A

When added sodium hydroxide:
White ppt is formed. White ppt dissolves in excess NaOH to produce a colourless solution.
When added aqueous ammonia:
White ppt is formed. White ppt dissolves in excess aqueous NH3 to form a colourless solution.

19
Q

How to test for NH 4+

A

When added sodium hydroxide:
No ppt formed
When added aqueous ammonia:
No ppt formed
Upon heating:
Effervescence of colourless and pungent gas observed.

20
Q

How to test for CO3 2- (carbonate)

A

Add dilute HCl, effervescence of colourless and odourless gas observed. Gas turns calcium hydroxide into a white ppt.

21
Q

How to test for Cl - (Chloride)

A

Add dilute HNO3 then add AgNO3 solution. A white ppt is formed.

22
Q

How to test for I - (Iodide)

A

Add dilute HNO3, then add silver nitrate solution. Yellow ppt formed.

23
Q

How to test for NO 3- (Nitrate)

A

Add dilute HNO3, then add a piece of aluminium foil. Warm the mixture. Efferverscence of colourless and pungent gas. No ppt is observed. Gas turns moist red litmus paper blue.

24
Q

How to test for SO4 2- (Sulfate)

A

Add dilute HNO3, then add aqueous Ba(NO3)2. White ppt formed.

O Level Chemistry (1 decks)

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