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C1-Chemistry in Our World

Topic3: Acids

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
Examples:
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
electrode
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
gas
HCl H+ Cl- Hydrogen Chlorine gas X
gas
Brine or sea Na+ OH- Hydrogen Chlorine gas NaOH
water H+ Cl- gas
NaCl…

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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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Answers:




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C1-Topic 3 Acids Revision2012 Page 10

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