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B-13
REPORT: EXPERIMENT B- CHEMICAL REACTIONS OF COPPER
Name
____________________________________
Section
___________ Date
___________________
Laboratory Instructor
________________________
1.
a)
A light blue precipitate is formed when copper(II) ions are reacted with either NaOH
(aq)
or
dilute NH
3(aq)
. What is the chemical formula of this precipitate? (0.2 marks)
Write the appropriate balanced molecular or net ionic
equation(s) for the formation of
this precipitate with each base.
i) from ammonia (2 equations required) (0.6 marks):
__________________________________________________________________
__________________________________________________________________
ii) from NaOH (0.2 marks):
__________________________________________________________________
b)
Using experimental evidence, show that the reaction product of Cu
2+
(aq)
in both NaOH
(aq)
and
solutions of relatively low concentrations of NH
3(aq)
is insoluble, but the reaction product of
Cu
2+
(aq)
with solutions of relatively high concentrations of NH
3(aq)
is soluble. Include, in your
explanation, balanced equations for all appropriate reactions. (1.0 mark)
