2.4 Acids and redox ✓
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1
What is released into solution when acid dissolves in water?
hydrogen ions as protons (H+)
2
What makes an acid strong?
complete dissociation
3
What makes an acid weak?
partial dissociation
4
What is meant by complete dissociation?
acid releasing all its H atoms into solution as H+ ions
5
What is meant by partial dissociation?
acid releases small proportion of available hydrogen atoms as H+ ions into solution
6
Are most organic acids weak or strong?
weak
7
What is a base?
substance that neutralises acid to form salt
8
What is an alkali?
base that dissolves in water, releasing hydroxide ions (OH-) into solution
9
What substances are classified as bases?
-metal oxides
-metal hydroxides
-metal carbonates
-ammonia
-metal hydroxides
-metal carbonates
-ammonia
10
Acid + Metal oxide/ hydroxide ->
salt + water
11
Metal carbonate + acid ->
salt + water + carbon dioxide
12
What can titration be used for? (3)
-find concentration of solution
-identify unknown chemicals
-find purity of substance
-identify unknown chemicals
-find purity of substance
13
Why is checking purity important as quality control?
tiny impurity could cause harm in food, medicine and cosmetics
14
What is a standard solution?
solution of known concentration
15
What is a volumetric flask used for?
make up standard solution very accurately
16
Burette reading recorded to nearest.....
half division
17
Where on the meniscus do you measure from?
bottom
18
What is the titre?
What is the titre?
volume of solution added from burette
19
What 3 things will you know after titration?
-reacting volume of one solution
-concentration and reacting volume of other solution
-concentration and reacting volume of other solution
20
What is an oxidation number?
number of electrons imvolved in bonding to different element
21
What is the oxidation number for elements?
0
22
What happens to the oxidation number during oxidation?
increase
23
What happens to the oxidation number during reduction?
decrease
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