ICSE BoardEnglish MediumSTD 10ChemistryPractical Work3 Marks
Question
Caustic soda solution is added to $Cu \left( NO _3\right)_2$ solution and product boiled.
✓
Answer
When Caustic soda solution is added to $Cu \left( NO _3\right)_2$ solution, the following reaction takes place:
$
Cu \left( NO _3\right)_{2(a q)}+2 NaOH _{( aq )} \rightarrow Cu ( OH )_{2(5)}+2 NaNO _{3( aq )}
$
When we heat it further, the greenish blue copper hydroxide decomposes to form slightly black ppt. of copper oxide.
$
Cu ( OH )_2( S ) \xrightarrow{\Delta} CuO ( s )+ H _2 O ( g )
$
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