Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

O Level Chemistry > Quantatative Analysis > Flashcards

Quantatative Analysis Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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+

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

Cl - (Chloride)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

I - (Iodide)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

SO4 2- (Sulfate)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions