SCIENCE - PH SCALE

what is an example of a neutral ph

water is an example of a neutral ph

name three examples of a base

soap
bleach
oven cleaner

What numbers does the pH scale range from?

0-14

What no is a neutral pH?

pH of 7

name three examples of a acid

vinegar
lemon juice
fizzy drinks

is the no 14 on the ph scale an acid or a base?

base

alkali

A base that dissolves in water

litmus paper turns blue when.....

its a base

litmus paper turns red when.....

its a acid

Universal indicator

A mixture of indicators which show different colours in solutions of different pHs

Titration experiment

1) Add a base to a conical flask with drops of indicator.
2) Fill burette with the acid.
3) Using the burette, add the acid to the alkali a bit at the time - giving the flask a regular swirl. Go esp. slowly when end point is about to be reached.
4) Indicator changes colour when all the alkali has been neutralised e.g. phenolphthalein is pink in alkalis but colourless in acids.
5) Record vol of acid used to neutralise the alkali.

acid + base = ?

salt + water

chemical formula for hydrochloric acid

HCl

chemical formula for Sodium hydroxide

NaOH

chemical formula for salt

NaCl

chemical formula for water

H2O