1) The concentration of hydrogen peroxide, H2O2, in a solution is determined by
ID: 511412 • Letter: 1
Question
1) The concentration of hydrogen peroxide, H2O2, in a solution is determined by titrating a 11.5 mL sample of the solution with permanganate ion, producing manganese(II) ion and oxygen gas. A)Enter the balanced chemical equation for the redox reaction that occurs in acidic solution. B)If it takes 17.0 mL of 0.127 M permanganate solution to reach the equivalence point, what is the molarity of the hydrogen peroxide solution?
2)Ammonium nitrate decomposes explosively upon heating according to the following balanced equation:
2NH4NO3(s)2N2(g)+O2(g)+4H2O(g)
A) Calculate the total volume of gas (at 123 C and 733 mmHg ) produced by the complete decomposition of 1.69 kg of ammonium nitrate.
Explanation / Answer
1)
A)
balanced chemical equation
2 MnO4-(aq) + 5H2O2(aq) + 6 H+(aq) --------------------> 2 Mn2+(aq) + 5 O2(g) + 8 H2O(l)
B)
moles of MnO4- = 17.x 0.127 / 1000 = 2.159 x 10^-3
from the balanced equation :
2 mol MnO4- ----------------> 5 mol H2O2
2.159 x 10^-3 mol --------------> ??
moles of H2O2 = 2.159 x 10^-3 x 5 / 2 = 5.40 x 10^-3
moles = molarity x volume
5.40 x 10^-3 = molarity x 0.0115
concentration of H2O2 = 0.469 M
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