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Neutralisation and pH
· If you add acid to alkali, the pH will start at
about 13 and fall gradually at first
· As the neutralisation point is almost
reached, pH 7, the change becomes more
· Then if you continue to add acid eventually
it will reach pH 1 ­ obvious yes?…read more

Slide 3

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Neutralisation and pH
· The opposite is true for starting from an
acid and adding alkali
· Common indicators are phenolphthalein,
bromothymol blue and methyl orange
(sometimes called methyl red)…read more

Slide 4

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· If we know the volumes of both the acid and
the alkali, and the concentration of one of
them, then we can calculate the
concentration of the other
· Concentrations are expressed as the number
of moles in a particular volume…read more

Slide 5

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· The unit of concentration is shortened to
moles or molar but actually is,
· Moles per cubic decimetre or mol/dm3 or
mol dm-3 ­ they all mean the same thing
· A cubic decimetre is the same as a litre
(10x10x10 = 1000)…read more

Slide 6

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· In a titration, 50cm3 of 2mol dm-3 sodium
hydroxide was exactly neutralised by 30cm3
of hydrochloric acid.
What is the concentration of the
hydrochloric acid?…read more

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