Module 4 (C4): Acids and Bases

Module 4 (C4): Chemical Economics

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  • Created by: leah
  • Created on: 13-12-09 14:05

Acids and bases 1

  • Acids have a Ph of less than 7.
  • Bases are the oxides and hydroxides of metals.
  • soluble bases are called alkalis.
  • alkalis have a Ph greater than 7.

Acids and bases (alkalis) are chemical opposites. dded together in the correct amount, they can cancel each other out.

This is called neutralisation. (PH 7)

Acid+ Base > Salt + Water

carbonates neutralise acids to produce a salt and water, but they also produce Carbon Dioxide gas. (CO2) Acid + Carbonate > Salt + Water + Carbon Dioxide

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Acids and bases 2

Naming Salts

The first name of a salt made by neutralisation comes from the first name of the base or carbonate used e.g.

  • Sodium Hydroxide will make a Sodium salt..
  • Copper Oxide will make a copper salt ..

The second name comes from the name of the acid used e.g.

  • hydrochloric acid will produce a chloride salt
  • sulfuric acid will produce a sulfate salt
  • nitric acid will produce a nitrate salt...

Sulfuric acid- to clean metals before being painted or coated, to neutalise fertilisers & in car and motorbike batteries.

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More on Neutralisation (Higher Tier)

Neutrlisation can be summarised by looking at what happens to the ions in the solutions:

alkalis in solution contain hydroxide ions, OH- (aq)

acids in solution contain hydrogen ions, H+ (aq)

Acid + base > Salt + water

Therefore Neutralisation can be described as..

H+ (aq) + OH- (aq)> H2O (l)

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Thank you!

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