CN^- 12.73 mL 25.00 mL Ni^2+ Ni(CN)4^2- 10.15 mL 0.01307 M EDTA 39.35 mL

CN^- 12.73 mL 25.00 mL Ni^2+ Ni(CN)4^2- 10.15 mL 0.01307 M EDTA 39.35 mL

 

 

Cyanide solution (12.73 mL) was treated with 25.00 mL of Ni^2+ solution (containing excess Ni^2+) to convert the cyanide into tetracyanonickelate(II):

4CN^- + Ni^2+ → Ni(CN)4^2-

Excess Ni^2+ was then titrated with 10.15 mL of 0.01307 M EDTA. Ni(CN)4^2- does not react with EDTA. If 39.35 mL of EDTA were required to react with 30.10 mL of the original Ni^2+ solution, calculate the molarity of CN^- in the 12.73 mL sample.

 

 

 

답: 0.09253 M

[ 해설 https://ywpop.blogspot.com/2024/09/cn-1273-ml-2500-ml-ni2-nicn42-1015-ml.html ]

 

 

 

[키워드] 4CN^- + Ni^2+ → Ni(CN)4^2- 기준, 화학량론 기준, 정량분석 기준