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Testing for ions

Joshua Rees

Tests for functional groups

Description

A - level chemistry AQA tests for functional groups that you need to know

Flashcards by Wannie Chisala, updated more than 1 year ago

	Created by Wannie Chisala almost 10 years ago

129

6

(3)

Resource summary

Question	Answer
Test for alkene	Reagents: Bromine water Positive Test: decolourises (from brown)
Test for haloalkane	Reagents: add NaOH and warm, acidify with HNO3 (to remove carbonate ions) then add AgNO3. Positive Test: white precipitate (chloride), cream precipitate (bromide), yellow precipitate (iodide)
Test for alcahol (primary or secondary)	Reagents: Acidified Potassium Dichromate Positive Test: Orange to green
Test for aldehyde	Reagents: Fehlings solution Positive test: Blue to brick red precipitate OR Reagents: Tollens solution Positive Test: Silver mirror formed
Test for carboxyllic acid	Reagents: Na2CO3 Positive Test: Effervescense
Test for acylchloride	Reagents: Add acidified silver nitrate Positive test: Vigorous reaction and white precipitate

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