C10.4 Carboxylic acids and esters

Question 1

What is the functional group of ethanoic acid?

Answer 1

COOH

Question 2

What do carboxylic acids form when they dissolve in water?

Answer 2

Form acidic solutions

Question 3

What does ethanoic acid make when it reacts with sodium carbonate?

Answer 3

Sodium ethanoate + water + carbon dioxide

Question 4

Why are carboxylic acids called weak acids?

Answer 4

Carbon dioxide gas is given off more slowly when a metal carbonate reacts with a carboxylic acid as compared to HCL with the same conecnetration

Question 5

How do acids show their acidic properties?

Answer 5

Dissolve in water

This because in water all acids ionise

Question 6

What do strong acids do that weak acids don’t?

Answer 6

Ionise completely
A carboxylic acid has a higher PH meaning less concentration of H+ ions than a strong acid resulting in a slower reaction with a metal carbonate

Question 7

How are esters made?

Answer 7

Reacting the carboxylic acid with alcohols

An acid - usually sulfuric acid is used as a catalyst

Question 8

What does carboxylic acid + alcohol make?

Answer 8

Ester + water

Question 9

What properties do esters have?

Answer 9

Have distinctive smells

They are volatile (evaporate easily)

Question 10

What are the uses of esters?

Answer 10

Makes them ideal to use in perfumes and food flavourings