Tests + Reactions I Must Rmb 🧠 Flashcards Preview

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

What does Cu2+ and NaOH form?

Does it dissolve in excess NaOH

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

Insoluble in excess NaOH

2

Reaction between Fe2+ and NaOH

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

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

Fe3+ with NaOH reaction

Soluble or insoluble in excess NaOH

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

Insoluble in excess

4

Mn2+ and NaOH

Soluble or insoluble in excess

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

Darkens on standing in air
Insoluble in excess NaOH

5

Test for carbonate ions

Add dilute HNO3
Effervescence as co2 is evolved

6

Test for sulphate ions

Add Ba2+ ions

White ppt forms

7

Test for Cl-, Br-, I-

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

Testing of alkenes

Bromine water turns from orange to colourless

9

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


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

10


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

Aldehyde - silver mirror forms inside the test tube
Ketone - no visible change

11


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

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

12

How can the presence of a carboxylic acid be tested

What is the observation

By addition of sodium carbonate.

It will fizz and produce co2

13

How do you test for presence of COOH
What’s the observation

Add sodium carbonate

It will fizz and produce co2

14

Acid + metal forms

Salt and hydrogen

15

Acid + alkali form

Water and salt

16

Acid and carbonate forms

Salt + water + co2