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Preview of Acids

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C1-Chemistry in Our World
Topic3: Acids
Turn blue litmus reD
Have pH less than 7
They change universal indicator from green TO- red, pink, yellow, yellow green
Are corrosive
Have names ending in `-ic'
They have hydrogen in them
o Hydrochloric- HCl
o Nitric- HNO3
o Sulphuric- H2SO4
Turn litmus Blue
Have pH more than 7
They change universal indicator from green TO- purple, blue, blue green
Are corrosive
Two types:
o Soluble- hydroxides
o Insoluble- carbonates, oxides, hydrogen carbonates
They have metals in them.
o Sodium hydroxide- NaOH
o Calcium hydroxide-Ca(OH)2
o Potassium carbonate-K2CO3
o Calcium carbonate-CaCO3
o Magnesium oxide-MgO
o Copper oxide-CuO
o Lithium oxide-Li2O
C1-Topic 3 Acids Revision2012 Page 1

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Neutralisation Reactions
Electrolysis and Chlorine
Electrolysis breaks down
compounds using electricity.
The compounds are broken into positive and negative ions.…read more

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The positive ion moves to the negative
The negative ion moves to the positive electrode.…read more

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What do we get from electrolysis?
Compound-el Positive Products
ectrolyte ion
Negative Cathode Anode In the
ion solution
Water (H2O) H+ OH -
Hydrogen Oxygen gas X
HCl H+ Cl- Hydrogen Chlorine gas X
Brine or sea Na+ OH- Hydrogen Chlorine gas NaOH
water H+ Cl- gas
NaCl liquid Na+ Cl- Sodium Chlorine gas X
(molten) metal
Uses of Chlorine:
Purification of water (drinking and swimming pools)
Making bleach
Making plastics
Uses of hydrogen:
Rocket fuel
Hydrogen powered cars
Manufacture of margarine
Making…read more

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Manufacturers of the three indigestion tablets shown above all claim that their product is the
best for treating indigestion. How can you investigate which claim is correct?
1. Weigh equal mass of the three indigestion tablets.
2. Crush the tablets with a mortar and pestle.
3. Dissolve each in a conical flask with 25cm3 of distilled water.
4. Add three drops of universal indicator.
5. Fill a burette with HCl.
6.…read more

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