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Neutralisation for OCR A-level Chemistry

Neutralisation

This page covers the following topics:

1. Neutralisation reactions
2. Neutralising carboxylic acids

A neutralisation reaction is a reaction between an acid and a base during which a salt and water is formed. The salt is usually named by using a combination of the base positive ion and an acid negative ion. For example, sodium hydroxide with sulphuric acid would produce sodium sulphate and water. Many neutralisation reactions can be simplified to just Hโบ + OHโป โ†’ Hโ‚‚O.

Acids react with some metal oxides and metal hydroxides to produce a salt and water.
CaO + Hโ‚‚SOโ‚„ โ†’ CaSOโ‚„ + Hโ‚‚O
KOH + HCl โ†’ KCl + Hโ‚‚O

Acids can also be neutralised when reacting with carbonates. Acids, both strong and weak, react with metal carbonates to produce a salt, water and carbon dioxide.
MgCOโ‚ƒ + 2HCl โ†’ MgClโ‚‚ + Hโ‚‚O + COโ‚‚

Neutralisation reactions

Carboxylic acids react with some metal oxides and metal hydroxides to produce a salt and water.
CaO + 2CHโ‚ƒCOOH โ†’ (CHโ‚ƒCOO)โ‚‚Ca + Hโ‚‚O
KOH + CHโ‚ƒCOOH โ†’ CHโ‚ƒCOOK + Hโ‚‚O

Carboxylic acids react with metal carbonates to produce a salt, water and carbon dioxide.
MgCOโ‚ƒ + 2CHโ‚ƒCOOH โ†’ (CHโ‚ƒCOO)โ‚‚Mg + Hโ‚‚O + COโ‚‚

Neutralising carboxylic acids

1

Provide a balanced chemical equation for the reaction between butanoic acid and sodium oxide.

Carboxylic acids react with some metal oxides and metal hydroxides to produce a salt and water.

Naโ‚‚O + 2CHโ‚ƒCHโ‚‚CHโ‚‚COOH โ†’ 2CHโ‚ƒCHโ‚‚CHโ‚‚COONa + Hโ‚‚O

Provide a balanced chemical equation for the reaction between butanoic acid and sodium oxide.

2

What is a balanced equation for the reaction of butanoic acid with strontium oxide?

Carboxylic acids react with some metal oxides and metal hydroxides to produce a salt and water.

SrO + 2CHโ‚ƒCHโ‚‚CHโ‚‚COOH โ†’ (CHโ‚ƒCHโ‚‚CHโ‚‚COO)โ‚‚Sr + Hโ‚‚O

What is a balanced equation for the reaction of butanoic acid with strontium oxide?

3

What are the two main ions responsible for the production of Hโ‚‚O in a reaction between an acid and an alkali?

Many neutralisation reactions can be simplified to just Hโบ + OHโป โ†’ Hโ‚‚O.

Hโบ, OHโป

What are the two main ions responsible for the production of Hโ‚‚O in a reaction between an acid and an alkali?

4

Which hydrogen in a carboxylic acid molecule most commonly participates in a neutralisation reaction?

Carboxylic acids react with some metal oxides and metal hydroxides to produce a salt and water. For example, KOH + CHโ‚ƒCOOH โ†’ CHโ‚ƒCOOK + Hโ‚‚O. Therefore, the hydrogen in the carboxylic group is involved in the reaction.

4

Which hydrogen in a carboxylic acid molecule most commonly participates in a neutralisation reaction?

5

What is a neutralisation reaction?

A neutralisation reaction is a reaction between an acid and a base during which a salt and water is formed.

a reaction between an acid and a base with a salt and water formed

What is a neutralisation reaction?

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