26.3 - Carboxylic acids Flashcards Preview

OCR A Chemistry A Level - Chapter 26 > 26.3 - Carboxylic acids > Flashcards

Flashcards in 26.3 - Carboxylic acids Deck (7)
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1

What does the carboxyl group look like?

Contains hydroxyl and carbonyl 

2

Describe the solubility of carboxylic acids.

  • Both the carbonyl and hydroxyl are polar so they can H-Bond with water
  • Carboxylic acids with up to 4 carbons are soluble in water
    • Solubility decreases as chain lenght increases, as non-polar carbon chains affect overall molecule polarity
  • Dicarboxylic acids are solid at RT and readily dissolve in water

3

Are carboxylic acids strong or weak

WEAK ACIDS

HCOOH(aq) ⇔ H+(aq) + HCOO-(aq)
partial dissociation

4

What are the acid reactions of carboxylic acids?

Carboxylic acids undergo:

  • Redox w/ metals
  • Neutralisation w/bases

All result in carboxylic acid → carboxylate salt

(example shown is carboxylic acid + NaOH)

5

Give general reactions for carboxylic acids + metals

carboxylic acid + metal → H2 + carboxylate salt

example of a carboxylate salt

 

6

Give general neutralisation reactions for carboxylic acids

+ metal oxides

CA + metal oxide → carboxylate salt + water

+ alkali

CA + alkali → carboxylate salt + water

+ carbonate

CA + CO32- → carboxylate salt + water + carbon dioxide

7

How do you test for carboxyl groups?

Carboxylic acids are the only acids, sufficiently acidic enough to react w/ carboncates, as opposed to phenols which can't