Hi, can anybody help me with the question
below:
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The chemical equation below shows the
formation of lead chloride and sodium nitrate.
Pb(NO3)2 + 2 NaCl
à
PbCl2 + 2
NaNO3
A student wants to prepare at least one of
the two products in the above reaction. However, he has only the
following reagents available:
Lead nitrate, nitric acid, hydrochloric
acid, sodium chloride, lead oxide, sodium
hydroxide.
(a) Name two reagents, from the above list,
which can be used to prepare at least one of the
products.
(b) Outline the steps needed to prepare a
clean and dry sample of the product mentioned in (a)
above.
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Thanks in advance!
To obtain PbCl2(s), mix of NaCl(aq) with Pb(NO3)2(aq), doesn't
matter which is in excess. The reside would be the desired
PbCl2(s), while the filtrate would be a mixture of NaNO3(aq) and
either NaCl(aq) or Pb(NO3)2(aq) depending on which was used in
excess. Wash the PbCl2(s) with distilled water, and dry with filter
paper.
If NaNO3(aq) is desired, carry out titration of
HNO3(aq) against NaOH(aq) (or vice-versa), with a
suitable pH indicator. Titration is necessary because we do
not want excess of either reactant (both of which are soluble, thus
we cannot use the filtration method). Warm gently to evaporate
away excess water, and cool the saturated solution to obtain
crystals. Wash the NaNO3 crystals with distilled water, and dry
with filter paper.