Tests + Reactions I Must Rmb 🧠Flashcards
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
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
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
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
Test for carbonate ions
Add dilute HNO3
Effervescence as co2 is evolved
Test for sulphate ions
Add Ba2+ ions
White ppt forms
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
Testing of alkenes
Bromine water turns from orange to colourless
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]+
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
What is fehlings solution used to test for , what’s the result
Aldehydes - blue Cu2+ ions change to red ppt of Cu2O
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
How do you test for presence of COOH
What’s the observation
Add sodium carbonate
It will fizz and produce co2
Acid + metal forms
Salt and hydrogen
Acid + alkali form
Water and salt
