Chapter 3, Problem 3.137P

(a)

Interpretation Introduction

Interpretation:

The mass of braunite and of manganosite present in the ore is to be calculated.

Concept introduction:

Mass percent is employed to determine the concentration of one compound in a mixture of the compound. The formula to calculate mass percent is as follows:

  $\text{Mass percent of compound}=\left(\frac{\text{mass of the compound}}{\text{mass of mixture}}\right)100$

(b)

Interpretation Introduction

Interpretation:

The ${\text{Mn}}^{3+}{\text{/Mn}}^{2+}$ ratio in the ore is to be calculated.

Concept introduction:

An ionic bond is formed by the interaction of a metal with a non-metal. When a metal element interacts with a non-metal, the metal loses electron/electrons. The electrons lost are gained by the nonmetal. The metal turns into a cation whereas the non-metal turns into an anion. The electrostatic force of attraction between the cation and the anion leads to the formation of an ionic bond between the two. The constituents in an ionic compound are ions.

Ionic compounds dissociate into ions when dissolved in water.