A cyanide solution with a volume of 12.02 mL12.02 mL was treated with 20.00 mL20.00 mL of Ni2+Ni2+ solution (containing excess Ni2+Ni2+) to convert the cyanide into tetracyanonickelate(II):   4CN−+Ni2+⟶Ni(CN)2−44CN−+Ni2+⟶Ni(CN)42−   The excess Ni2+Ni2+ was then titrated with 11.49 mL11.49 mL of 0.01257 M0.01257 M ethylenediaminetetraacetic acid (EDTA):   Ni2++EDTA4−⟶Ni(EDTA)2−Ni2++EDTA4−⟶Ni(EDTA)2−   Ni(CN)2−4Ni(CN)42− does not react with EDTA. If 39.02 mL39.02 mL of EDTA were required to react with 30.34 mL30.34 mL of the original Ni2+Ni2+ solution, calculate the molarity of CN−CN− in the 12.02 mL12.02 mL cyanide sample. [CN−]= M

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A cyanide solution with a volume of 12.02 mL12.02 mL was treated with 20.00 mL20.00 mL of Ni2+Ni2+ solution (containing excess Ni2+Ni2+) to convert the cyanide into tetracyanonickelate(II):

 

4CN−+Ni2+⟶Ni(CN)2−44CN−+Ni2+⟶Ni(CN)42−

 

The excess Ni2+Ni2+ was then titrated with 11.49 mL11.49 mL of 0.01257 M0.01257 M ethylenediaminetetraacetic acid (EDTA):

 

Ni2++EDTA4−⟶Ni(EDTA)2−Ni2++EDTA4−⟶Ni(EDTA)2−

 

Ni(CN)2−4Ni(CN)42− does not react with EDTA. If 39.02 mL39.02 mL of EDTA were required to react with 30.34 mL30.34 mL of the original Ni2+Ni2+ solution, calculate the molarity of CN−CN− in the 12.02 mL12.02 mL cyanide sample.

[CN−]= M
 
 
 
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