Chemistry (9-1) - 0971 CIE

Carboxylic Acids

Gbogbo ọrọ náà

The sharp taste of vinegar comes from ethanoic acid, the best known member of the carboxylic acids. This family is marked by the -COOH functional group, and although these are weak acids, they show all the familiar acid reactions you already know.

In this lesson you will learn that carboxylic acids form a homologous series with the -COOH group, how ethanoic acid reacts with metals, bases and carbonates as a typical acid, and how it reacts with an alcohol to form a sweet-smelling ester.

Ebumnobi

  1. Describe the reaction of ethanoic acid with: (a) metals (b) bases (c) carbonates including names and formulae of the salts produced.
  2. [Supplement] Describe the formation of ethanoic acid by the oxidation of ethanol: (a) w ith acidified aqueous potassium manganate(VII) (b) b y bacterial oxidation during vinegar production.
  3. [Supplement] Describe the reaction of a carboxylic acid with an alcohol using an acid catalyst to form an ester.

Akọmọ Ojú-ẹkọ

Carboxylic acids connect organic chemistry back to the acid reactions you met earlier. Ethanoic acid is found in vinegar and made industrially from ethanol, and the esters it forms give fruits and perfumes their pleasant smells. The family ties several parts of the syllabus together.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Carboxylic Acids. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

  1. The functional group of the carboxylic acids is: A. -OH B. -COOH C. C=C D. -Cl Answer: B
  2. Ethanoic acid is classed as a: A. Strong acid B. Weak acid C. Base D. Neutral substance Answer: B
  3. Ethanoic acid reacts with magnesium to give hydrogen and: A. An ester B. A magnesium ethanoate salt C. Carbon dioxide D. An alcohol Answer: B
  4. Ethanoic acid reacts with sodium carbonate to give a salt, water and: A. Hydrogen B. Oxygen C. Carbon dioxide D. An ester Answer: C
  5. A carboxylic acid reacts with an alcohol to form water and a(n): A. Salt B. Ester C. Alkane D. Carbonate Answer: B

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Meecha Ajụjụ Ule Ọmarịcha

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