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Explain what makes solutions acidic or alkaline
Explain what happens in neutralisation reactions
- Revisit the work you covered at KS3 on the pH scale and acids and alkalis.
- Make the required notes and answer questions on acids, alkalis and neutralisation.
- Watch a demonstration by your teacher.
- Complete the homework task.
Watch this video clip to recap exothermic and endothermic reactions.
Bee stings are acidic to treat them you must add a weak alkali such as toothpaste or baking soda. This neutralises the sting.
Wasp stings are alkali, to treat them you must add a weak acid such as vinegar or lemon juice.
If a Wasp and Bee stung you at the same time in the same place with the same amount of sting would it hurt?
Acids are found in
Your stomach to digest food
Food stuff such as lemon and vinegar
The pH Scale can be used with Universal indicator to tell us how acid or alkali a substance is.
A solution with a pH of 7 is __________?
A solution with a pH less than 7 is_________?
A solution with a pH of more than 7 is _________?
Here are the formulae of some acids
HCl, H2SO4, HNO3, H3PO4, CH3COOH
Q1 Give the formula of the ion that makes solutions acidic.
Q2 A solution has a pH of 10.5 is it acidic, alkaline or neutral?
All metal oxides are called bases, some metal oxides dissolve in water to form hydroxides we call these bases alkalis. Here are the formulae of some alkalis NaOH, KOH, NH4OH. The Hydroxide ion is written
Q3 Give the formula of the ion that makes solutions alkali.
Remember back in KS3 when we looked at neutralisation .......
But what happens when acids neutralise alkalis?
Copy these equations into your notes and highlight them.
Acid + Alkali à Salt + Water
H+ + -OH à H2O
Hydrochloric + Sodium à Sodium + Water
Acid Hydroxide Chloride
Q4 Explain the meaning of the terms (l) and (aq).
Q5 Explain the meaning of the neutralisation equation.
H+(aq) + -OH(aq) ==> H2O(l)
Q6 Copy and complete this table:
Watch while your teacher demonstrates the chemiluminescent ammonia fountain.
Have you been successful?
- Revisited the work you covered at KS3 on the pH scale and acids and alkalis.
- Made the required notes and answered questions on acids, alkalis and neutralisation.
- Watched a demonstration by your teacher.
Now you must
- Complete the homework task.
· Recall the meaning of the terms acid, base and alkali.
· Explain how ammonia is classified as an alkali.
· Use ideas about pH, H+ and OH- ions to explain acidity and alkalinity.
· Explain what happens in a neutralisation reaction.
What to do
Design a set of computer presentation slides to summarise what you know about acids, alkalis and bases.
In your slides, you should explain
· the meanings of the words acid, alkali and base
· the pH scale and what we can conclude from pH values
· what ions are present in acids and alkalis
· what happens when acids and alkalis react.
You should also
· include plenty of graphics, diagrams, graphs and photographs
· include examples of each of these substances, including some taken from everyday life.
You should not
· copy large amounts of text
· include more than 30 words on any single slide.
You must print a preview of your slides and paste them into your book. Bring your presentation to school on a memory stick.
copy ofhomework sheet.