What is the coordination entity formed w | Class 12 Chemistry Chapter Coordination Compounds, Coordination Compounds NCERT Solutions

Question:

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?

Answer:

CuSO4(aq)  +  4KCN(aq)   →  K2[Cu(CN)4](aq)  +  K2SO4(aq

i.e., [Cu(H2O)4]2+   +   4CN-     →  [Cu(CN)4]2-  + 4H2

 

Thus, the coordination entity formed in the process is K2[Cu(CN)4]. K2[Cu(CN)4 is a very stable complex, which does not ionize to give Cu2+ ions when added to water. Hence, Cu2+ ions are not precipitated when H2S(g) is passed through the solution.


Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Coordination Compounds.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

Comments

Comment(s) on this Question

Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 2 , Question 14: What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of....