Sorry its sideways, it wouldn\'t let me flip it. b) which element is getting red

Question

Sorry its sideways, it wouldn't let me flip it.

b) which element is getting reduced? c) how many electrons are getting transferred? So 0. 1 25 g of your green crystals was put into an Erlenrneyer flask. To this 30 mL of DI water was added along with 5 mL of 6M H2SO4 which causes the green solution to become clear. The solution is then heated and titrated with a 0.0 1 M potassium permanganate solution to produce a purple endpoint at 31.23 mL. 9. Calculate the number of moles of MnO4^-1 ion that reacted with the green crystals 10. Calculate the mass of C2O4^-2 in the green crystal sample 11 . Calculate the % of C2O4^-2 in the sample

Explanation / Answer

Solution for Q9.

Balanced Chemical equation :

2MnO4+5H2C2O4+6H+2Mn2++10CO2+8H2O

Moles of MnO4- = 0.01M *0.03123L = 3.12*10-4 moles

Solution for Q9.

From balanced reaction we can predict that mole ratio of MnO4- : C2O42- is 2:5

so 3.12*10-4 moles MnO4- * 5 moles of C2O42- / 2 moles of MnO4-   = 7.81*10-4 moles of C2O42-

Mass of C2O42- =7.81*10-4 moles of C2O42- *88g/mole = 6.87*10-2 g

Solution for Q11

% of C2O42-   = 6.87*10-2 g /0.125g*100%   = 55%

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.