Redox titrations are used to determine the amounts of oxidizing and reducing age

Question

Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction: 2KMnO4(aq)+H2O2(aq)+3H2SO4(aq)3O2(g)+2MnSO4(aq)+K2SO4(aq)+4H2O(l) A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. How much H2O2 was dissolved if the titration required 17.8 mL of the KMnO4 solution? Express your answer numerically in grams.

Explanation / Answer

x mass of H2O2 in V = 100 ml

M = 1.68 M of KMnO4

V = 17.8 ml of KMnO4

then

mol of KMnO4= M*V = 17.8*1.68 = 29.904 mmol of KMnO4

then

from equation

2 mol of KMnO4 need 1 mol of H2O2

therefore, the ratio is 2:1

meaning that H2O2 = 1/2*KMnO4

then = 29.904 /2 = 14.952 mmol of H2O2

mass = mol*MW = (14.952*10^-3)(34) = 0.508368 g of H2O4

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

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