C2 - Acids and Alkalis

  • Bases
  • Salts
  • Oxides
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What is the pH scale?
The scale where acids and alkalis are determined. 1-6 is acid, 7 is neutral and 8-14 is alkali.
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What is an indicator?
A dye that changes the colour of a solution to match the pH scale.
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How does neutralisation work?
Acids form H+ ions in water, alkalis form OH- ions in water. Acid + base -> salt + water
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What are the state symbols?
(s) - solid (l) - liquid (g) - gas (aq) - aqueous/dissolved in water
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How do acids react with metals?
acid + metal -> salt + hydrogen
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What is the experiment for metal salts?
Put dilute acid in a test tube with a piece of metal. Light a splint and place it near the top of the test tube. If it squeaks, the hydrogen is present so the salt is being made.
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Which metals will react with acids?
Only the metals which are more reactive than the acid e.g. copper won't react with hydrogen chloride.
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how do acids react with metal oxides and metal hydroxides?
acid + metal oxide/hydroxide -> salt + water. The name of the salt will depend on the metal and acid used?
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How do you make soluable salts?
For metals or insoluable bases; add the metal to the acid and when the reaction is finished, filter it. For alkali; neutralise the acid then repeat using the sme amount of alkali and evaporate.
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How do you make insoluable salts?
Mix two solutions caontaing the ions that you need and filter the solution. This is a precipitation reaction.
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Other cards in this set

Card 2

Front

What is an indicator?

Back

A dye that changes the colour of a solution to match the pH scale.

Card 3

Front

How does neutralisation work?

Back

Preview of the front of card 3

Card 4

Front

What are the state symbols?

Back

Preview of the front of card 4

Card 5

Front

How do acids react with metals?

Back

Preview of the front of card 5
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