12. Carboxylic acids react with alkalis to produce salt and water.
+
+
CH, COOH
NaOH
Ethanoic acid Sodium hydroxide
NaCH COO
Sodium ethanoate
но
Water
a. What mass of water would be produced if 1.5 g of ethanoic acid was reacted completely
with sodium hydroxide?
Show your working clearly.
3

Mass of water : 0.45 g

Given

1.5 g ethanoic acid

Required

Mass of water

Solution

Reaction

CH₃COOH + NaOH ⇒H₂O + CH₃COONa

mol CH₃COOH(MW=60 g/mol) :

= mass : MW

= 1.5 : 60

= 0.025

mol H₂O from the equation :

= 0.025(mol ratio CH₃COOH : H₂O= 1 : 1)

Mass of water :

= mol x MW water

= 0.025 x 18 g/mol

= 0.45 g

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