Tests + Reactions I Must Rmb 🧠 Flashcards Preview

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Flashcards in Tests + Reactions I Must Rmb 🧠 Deck (16)
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1
Q

What does Cu2+ and NaOH form?

Does it dissolve in excess NaOH

A

Blue solution forms Cu(OH)2 solid , blue ppt

Insoluble in excess NaOH

2
Q

Reaction between Fe2+ and NaOH

What happens to the solid formed? Does it dissolve in excess NaOH

A

Pale green solution forms Fe(OH)2 solid - GREEN ppt

Insoluble in excess NaOH but turns to Fe(OH)3 ORANGE BROWN PPT at its surface on standing in air

3
Q

Fe3+ with NaOH reaction

Soluble or insoluble in excess NaOH

A

Pale yellow Fe3+ firms orange brown ppt of Fe(OH)3 solid

Insoluble in excess

4
Q

Mn2+ and NaOH

Soluble or insoluble in excess

A

Pale pink/colourless solution forms light brown ppt of Mn(OH)2 solid

Darkens on standing in air
Insoluble in excess NaOH

5
Q

Test for carbonate ions

A

Add dilute HNO3

Effervescence as co2 is evolved

6
Q

Test for sulphate ions

A

Add Ba2+ ions

White ppt forms

7
Q

Test for Cl-, Br-, I-

A

Add AgNO3

White ppt for chloride ions, soluble in dilute NH3
Creamy ppt for bromide ions, soluble in conc NH3
yellow ppt for iodide ions, insoluble in conc NH3

8
Q

Testing of alkenes

A

Bromine water turns from orange to colourless

9
Q

What reagent is in Tollens Reagent Name the reaction, reagent and condition when secondary alcohol forms ketone

A

Aqueous ammonia and silver nitrate [Ag(NH3)2]+

10
Q

What’s the observation of tollens reagent when aldehydes or ketones are present

A

Aldehyde - silver mirror forms inside the test tube

Ketone - no visible change

11
Q

What is fehlings solution used to test for , what’s the result

A

Aldehydes - blue Cu2+ ions change to red ppt of Cu2O

12
Q

How can the presence of a carboxylic acid be tested

What is the observation

A

By addition of sodium carbonate.

It will fizz and produce co2

13
Q

How do you test for presence of COOH

What’s the observation

A

Add sodium carbonate

It will fizz and produce co2

14
Q

Acid + metal forms

A

Salt and hydrogen

15
Q

Acid + alkali form

A

Water and salt

16
Q

Acid and carbonate forms

A

Salt + water + co2