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the titration practical
titration chemistry lab
titration chemistry lab
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Recommended: the titration practical
Investigating the Concentrations of Unknown Acids
Aim
To find out each of the concentrations of the hydrochloric acids in
the Winchesters labelled A-E. This is going to be carries out by
titrating the acid with NaOH.
Equipment needed for this investigation
Pipette - 25ml
Burette
Phenolphthalein
Conical flask
Beaker
Funnel
Pipette filler
Clamp
NaOH - the known acid of 0.1M
HCl - the unknown concentration of acids
White tile
My predictions
I predict that the different acid solutions of the HCl will be less
than 0.1M because the Winchesters were topped up with water, which
would have obviously weakened the concentration of the acid making the
number of moles less than 0.1.
Safety precautions when doing the experiment:
v The equipment should be used carefully to prevent breakage of any
glass.
v The acids should be used carefully avoiding spillages and if any
acid came into contact it should be rinsed with water immediately to
prevent any irritation to the skin.
Planning
All the equipment is gathered together first and made sure that it is
clean and safe to use.
25ml of the unknown concentration of the HCl is measured using a
pipette and taken using a pipette filler, the liquid is then drained
into a clean conical flask. 3 drops of phenolphthalein indicator is
added to 25ml of HCl.
The burette is securely placed onto the clamp and the NaOH is poured
into the burette using a funnel and making sure that the tap at the
bottom is closed. The conical flask containing the HCl and
Phenolphthalein is placed on a white tile at the bottom end of the
burette.
The tap of the burette is opened to slowly release the NaOH while
swirling the conical flask to combine the two acids. The NaOH is
steadily added until the solution in the conical flask turns a pale
pink colour. If the solution stays the pale pink for up to 20 seconds