write equalibrium reaction ion is surrounded b four chloride ions. by six water
ID: 912846 • Letter: W
Question
write equalibrium reaction ion is surrounded b four chloride ions. by six water Initial Conditions Label three test tubes A-C and place them in a test tube rack. Using a graduated, Beral-type pipet, add about 2 cobalt ch to test tube each test tube. important, but try to keep the volume of the solution approximately in equal Procedure Observations Color of cobalt chloride Explanation solution Add 6.0 M HCl dropwise to test tube B Add 0.1 M AgNO3 dropwise to test tube B Add distilled water dropwise to test tube C Add 5-6 grams of CaCl2 to test tube C 2013 Flinn ScientificExplanation / Answer
The equilibrium reaction accordint to test tubes will be
A) We know that the colour of cobalt chloride solution is pink
The formula is
[Co(H2O)6]Cl2
B) On adding concentrated hydrochloric acid to given colored cobalt (II) chloride the colour of solution turns to blue
As the chloride ions displace the water molecules from the inner sphere of the complex.
The reaction will be
[Co(H2O)6]Cl2 + Cl- --> [CoCl4]-2
The given complex is blue in colour.
Tube C: If we add water further in the test tube then the colour of solution will be restored to pink due to formation of complex with water (octahedral complex is formed) .If we add more of CaCl2 to the test tube it will again turns to blue coloured solution due to formation of
[Co(H2O)6]Cl2 + Cl- --> [CoCl4]-2
Tube B: when we add AgNO3 to the solution it will give white precipitate of AgCl
AgNO3 + [Co(H2O)6] Cl2 ---> 2AgCl + [Co(H2O)6]+2
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