In the preparation of some pure crystals of Cu (NO3)2 starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report ?
some CuO was reacted with excess dilute H2SO4
the solution was concentrated
when the concentrate was cooled, crystals formed were removed by filtration
the crystals were washed with very little cold water
the crystals were then allowed to dry
Explanation
No explanation available
Video Explanation
No video available
Post your Contribution
Discussions (6)
Here is an explanation:
if Cuo should react with excess sulphuric acid( H2SO4), the crystal formed would contain Cu(SO4)2 instead of CU(NO3)2.
REF: check Basic Practical Chemistry, section four, page 44
in statement A: "some CuO was reacted with excess dilute H2SO4."
The correct reaction to form copper(II) nitrate (Cu(NO₃)₂) from copper(II) oxide (CuO) would involve reacting CuO with nitric acid (HNO₃), not sulfuric acid (H₂SO₄). Reacting CuO with dilute sulfuric acid would produce copper(II) sulfate (CuSO₄), not copper(II) nitrate.
So, the error is in using sulfuric acid instead of nitric acid.
