Chemistry 1 Flashcards
(16 cards)
What is an acid
A substance that dissolves in water to give it a pH less than 7
Name some common acids
Hydrochloric acid, sulfuric acid, nitric acid, ethanoic acid, citric acid, carbonic acid
What is an alkaline
It is a substance that dissolves in water to give it a pH higher that 7
Name some common alkalines
Calcium hydroxide (lime), magnesium hydroxide, sodium hydroxide and ammonia
What is an indicator
A substance that is one colour in an acid and another colour in an alkaline
Name a natural indicator
Red cabbage
Name some common lab indicators
Methyl orange, bromothymol blue, phenolphthalein, litmus
What is a pH scale
A pH scale is a number scale that shows how acidic or alkaline is
What is a solution with a pH of 7
Neutral
What is a solution with a pH less that 7
Acidic
What is a solution with a pH more than 7
Alkaline
What is more accurate a pH scale or a pH meter
A pH meter
What is a base
An insoluble metal oxide or hydroxide
Is an alkali a soluble base
Yes
What happens when a base reacts with an acid
It neutralises
How is salt made
In a neutralisation reaction
