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Title: GCSE C3 L5 The Importance Of Alkalis
Description: Typed includes uses of alkalis - brief explanation of the pH scale- examples of alkali reactions
Description: Typed includes uses of alkalis - brief explanation of the pH scale- examples of alkali reactions
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C3 L5 : The Importance Of Alkalis
Friday, September 25, 2015
2:44 PM
Traditional sources and its uses
Recall characteristics of alkaline hydroxides and carbonates
large scale methods
neutralizes acids to make salts
Red - 1 - acid
Green - 7 - neutral
Purple - 10 - green
Acids release hydrogen ions (+) into solution - pH ( Hence the hydrogen )
Alkalis release OH- into solution ( Hydroxide ion )
H+ from acids reacts with OH- from alkalis to form H2O
uses : ( For alkalis )
• Adjusting soil pH
• antacid tablets
• soap and cleaners
• making glass
• dying fabric
• paper production
alkali
dissolve in
water?
pH of the
water
reaction
with acid
pH of acid after
reacting with alkali
Metal
hydroxide
( Calcium
hydroxide )
no
10
no
1 -> 10
Metal
carbonate
( Sodium
carbonate )
yes
10
yes
1-> 7 neutralise
C3 Page 1
reaction with
limewater
cloudy releases CO2
Title: GCSE C3 L5 The Importance Of Alkalis
Description: Typed includes uses of alkalis - brief explanation of the pH scale- examples of alkali reactions
Description: Typed includes uses of alkalis - brief explanation of the pH scale- examples of alkali reactions