Unit 4 Test tube reactions DH
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Which test do you add NaOH in a mixture of ethanol and water. Then add dilute nitric acid. Then add silver nitrate solution?
Haloalkanes
What would the results of the haloalkane test show?
Cl- White precipitate Br- Cream precipitate I- Yellow precipitate
If you can’t quite distinguish between the colour of your precipitates during the haloalkane test what should you add to confirm?
Ammonia solution
When you add ammonia solution to your haloalkane precipitates what should you observe?
AgCl dissolves in dilute ammonia solution AgBr dissolves in concentrated ammonia solution AgI is insoluble in ammonia solution
When does a silver mirror form?
When you add Tollen’s reagent and heat with an aldehyde present
What is silver nitrate dissolved in ammonia known as?
Tollen’s reagent
What is copper(II) ions dissolved in NaOH?
Fehling’s solution
What is Benedict’s solution?
Copper(II) ions dissolved in Na2CO3
What is the difference between Benedict’s and Fehling’s solution?
Benedict’s is acidic and Fehling’s is Alkali
If you add Benedict’s to a solution made up of aldehyde’s and ketone’s what will you see?
The aldehyde’s will turn to a brick-red precipitate. The ketone will not react
Which organic compounds smell sweet?
Esters
How could you tell apart a solution of esters and carboxylic acids?
The solution containing eaters will smell sweet
What do you add to test for an alkene?
Bromine water
You’ve added orange bromine water to a solution and it has turned colourless, what is present in the solution?
Alkenes
You add sodium carbonate and CO2 is given off, what is present?
Carboxylic acid
What test requires you to add sodium bicarbonate?
Testing for carboxylic acids