2 more questions
A student tried to prepare 2 salts, barium sulphate and sodium
nitrate using the method described in the paragraph below
Aqueous barium nitrate was mixed with aqueous sodium
sulphate and the precipitate of barium sulphate was obtianed by
filtration. The residue was dried in an oven
The filtrate was heated until the solution is saturated.
Crystals of sodium nitrate was formed when the saturated solution
was cooled
i. State one omission in the preparation of barium suplhate.
Surely not the part on drying in oven?(though it sounds weird)
My guess is that he did not find out which was the salt in excess?
Well.
ii After the reaction the boron is obtained from the reaction
mixture by the following steps
i washing with warm dilute HCl acid (reason: to ensure
Mg has been completely reacted and is not found on
boron)
ii washing with a solution of NaOH ( to neutralise
dilute HCl used to wash boron)
iii. washing with distilled water (to remove any
remaining impurities found on boron)
Please help me check if the reasons I gave for the procedures
are logical and correct
Also
What is the difference between Cl-37 and Cl - 35
My ans: They are isotopes of chlorine with different number of
neutrons.
Both the reactants are aqueous so any ppt should be BaSO4 and
thus whether there is any excess or not would not affect the BaSO4
obtained since yield is not part of the question i assume.
Where did the B from the ii) come from?