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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…

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Neutralisation Reactions

Electrolysis and Chlorine

Electrolysis breaks down

compounds using electricity.
The compounds are broken into positive and negative ions.
The main set up:

C1-Topic 3 Acids Revision2012 Page 2

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The positive ion moves to the negative
The negative ion moves to the positive electrode.

C1-Topic 3 Acids Revision2012 Page 3

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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

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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…

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C1-Topic 3 Acids Revision2012 Page 6

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