sarah1004

Nov 24, 2009, 08:04 PM

standardization of KMnO4

Mass of H2C2O4.2H2O(MW=126g/mol),g------->0.25

Initial buret reading, mL-------------------------->0

Final buret reading, mL--------------------------->43

Volume of KMnO4 solution used, mL------------>43

Moles ofo oxalic acid used------------------------>0.002

Moles of KMnO4 used(refer to the equation)---->??

Molarity of KMnO4 solution------------------------>??

2MnO4^- + 5C2O4^2- + 16H^+ ----------------> 2Mn^2+ + 10CO2 + 8H2O

Mass of sample, g---------------------------------->0.8

Initial buret reading, mL--------------------------->0

Final buret reading, mL---------------------------->23

Volume of KMnO4 used, mL----------------------->23

Moles of KMnO4 used------------------------------>3.0

Moles of iron in sample---------------------------->??

Mass of iron in the sample, g---------------------->??

Percent of iron in the sample---------------------->??

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

I couldn't find that question marks answers.

Please help me to find these questions...

Thank you!

Mass of H2C2O4.2H2O(MW=126g/mol),g------->0.25

Initial buret reading, mL-------------------------->0

Final buret reading, mL--------------------------->43

Volume of KMnO4 solution used, mL------------>43

Moles ofo oxalic acid used------------------------>0.002

Moles of KMnO4 used(refer to the equation)---->??

Molarity of KMnO4 solution------------------------>??

2MnO4^- + 5C2O4^2- + 16H^+ ----------------> 2Mn^2+ + 10CO2 + 8H2O

Mass of sample, g---------------------------------->0.8

Initial buret reading, mL--------------------------->0

Final buret reading, mL---------------------------->23

Volume of KMnO4 used, mL----------------------->23

Moles of KMnO4 used------------------------------>3.0

Moles of iron in sample---------------------------->??

Mass of iron in the sample, g---------------------->??

Percent of iron in the sample---------------------->??

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

I couldn't find that question marks answers.

Please help me to find these questions...

Thank you!