Share Yr 11 Chem 1.2
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What is an acid?
A substance with a pH less than 7, has Hydrogen ions
What is a base?
A substance with a pH greater than 7.
What is neutralisation?
A reaction between an acid and a base.
What are reactants?
The starting substances in a reaction.
What are products?
The new substances formed in a reaction.
What colour is universal indicator in a strong acid?
Red
What colour is universal indicator at pH 7?
Green
What happens to red litmus paper in a base?
Turns blue
What does a colour change tell us when using an indicator?
A chemical change/reaction may be occurring.
Why do people take antacids?
To relieve heartburn/indigestion
What acid is found in the stomach?
Hydrochloric acid.
Are antacids acids or bases?
Bases.
What type of reaction occurs when an antacid reacts with stomach acid?
Neutralisation
How does an antacid help someone with heartburn?
It neutralises excess stomach acid and reduces acidity.
Which acid did we use in our neutralisation experiment?
Hydrochloric acid.
Which base did we react with the acid?
Sodium carbonate.
