Ferris & mona used the orp sensor to titrate a ferrous ammonium sulfate solution, (nh4)2fe(so4)2 with kmno4 titrant.
they titrated a 15.00 ml aliquot of the fe+2 solution with 0.0250 m mno4- solution and determined that the equivalence point was at 20.2 ml.

what is the molarity of the fe+2 solution? 5 fe+2(aq) + mno4-(aq) + 8 h+(aq) â 5 fe+3(aq) + mn+2(aq) + 4 h2oselect one: a. 0.168 mb. 0.0928 mc. 0.0337 md. 0.673 m

The correct option is: A. 0.168 M

Explanation:

Chemical reaction involved:

5 Fe²⁺ (aq) + MnO₄⁻ (aq) + 8 H⁺ (aq) → 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O

Given: For MnO₄⁻ solution-

Number of moles: n₁ = 1, Volume: V₁ = 20.2 mL, Concentration: M₁ = 0.0250 M;

For Fe²⁺ solution:

Number of moles: n₂ = 5, Volume: V₂ = 15 mL, Concentration: M₂ = ?M

To find out the concentration of Fe²⁺ solution (M₂), we use the equation:

Therefore, the concentration or molarity of Fe²⁺ solution: M₂ = 0.168 M

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.