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화학

redox. (NH4)2Fe(SO4)2*6H2O + KMnO4

by 영원파란 2017. 12. 17.

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redox. (NH4)2Fe(SO4)2*6H2O + KMnO4

황산제일철암모늄6수화물 산화-환원 적정

황산철(II)암모늄6수화물 산화-환원 적정

 

 

You had a 1.0929 g sample of ammonium iron (II) sulfate hexahydrate, (NH4)2Fe(SO4)2*6H2O. And you titrate it with 27.23 mL KMnO4. What was the concentration of KMnO4 you started with?

 

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산화: Fe^2+ Fe^3+ + e^-

환원: MnO4^- + 8H^+ + 5e^- Mn^2+ + 4H2O

 

 

산화: 5Fe^2+ 5Fe^3+ + 5e^-

환원: MnO4^- + 8H^+ + 5e^- Mn^2+ + 4H2O

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5Fe^2+ + MnO4^- + 8H^+ 5Fe^3+ + Mn^2+ + 4H2O

 

 

1.0929 g / (392.14 g/mol) = 0.0027870 mol Fe^2+

 

Fe^2+ : MnO4^- = 5 : 1 계수비(몰수비) 이므로,

Fe^2+ : MnO4^- = 5 : 1 = 0.0027870 mol : ? mol

? = 0.0027870 / 5 = 0.00055740 mol MnO4^-

 

 

0.00055740 mol / (27.23/1000 L) = 0.020470 M MnO4^-

 

 

: 0.02047 M

 

 

[키워드] 황산제일철암모늄 6수화물, 황산철(II)암모늄 6수화물

 

 

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