Testing Acidic Properties Of Carboxylic Acids

Question 1

What are the three tests?

Answer 1

Acid and base - salt and water
Acid and carbonate - co2, h20 and salt
Acid and metals -salt and hydrogen

Question 2

Give a balanced chemical equation for acid and base test

Answer 2

CH3COOH + NaOH - CH3COONa + H2O

Ethanoic acid + sodium hydroxide - sodium ethanoate and water

Question 3

Give a balanced chemical equation for acid and carbonate

Answer 3

CH3COOH + Na2CO3 - CO2 + H2O + CH3COONa

Ethanoic acid + sodium carbonate - carbon dioxide, water and sodium ethanonate

Question 4

Give a balanced equation for acid and metal [magnesium ribbon]

Answer 4

2CH3COOH + Mg - (CH3COO)2Mg + H2

Ethanoic acid + magnesium - magnesium ethanoate + hydrogen gas

Question 5

Describe test 1 - react carboxylic acid with a base

Answer 5

Base NaOH is added drop by drop until pink appears in ethanoic acid and phenolphthalein

Question 6

Describe test 2 - reacting acid with carbonates

Answer 6

Add Na2CO3 until fizzing occurs as CO2 is given off. Limewater will turn milky if CO2 is passed through it

Question 7

Describe test 3 - acid with metal [magnesium ribbon]

Answer 7

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Question 8

How could a student have carried out a simple chemical test to confirm that a colourless liquid sample was ethanoic acid and not ethanol?

Answer 8

Add sodium carbonate until fizzing occurs as CO2 is given off. Limewater will turn milky if CO2 is passed through it