Acid and Alkalis Flashcards
What is the pH scale?
it shows how acidic or alkaline a substance is
What is universal indicator?
it changes colour depending on the pH of the substance
The pH scale stretches from … to …
0-14
Anything with a pH below 7 is an …
acid
Anything with a pH above 7 is an …
Alkali
The strongest acid has a pH of …
0
The strongest alkali has a pH of …
14
Anything with a pH of 7 is a …
neutral
What is an indicator?
it is a special dye that changes colour depending on whether it’s an acid or an alkali
What is Litmus paper?
a type of indicator. Acids turn the paper red and alkalis turn the paper blue
What is universal indicator?
It is a mixture of dyes which shows how strong an acid or an alkali is.
What is the pH scale?
it shows how strong an acid or an alkali is.
What happens when you mix an acid with an alkali?
it neutralises. Acid+ alkali ➙ salt+ water
Hydrochloric acid is needed to make…
Chloride salts. like sodium chloride
Sulfuric acid is needed to make…
Sulfate salts like copper sulfate
