What is the molar solubility of fe(oh)3 in pure water? (ksp for fe(oh)3 is 4.0 x 10-38.) a. 6.5 x 10-7 m b. 4.5 x 10-10 m c. 4.0 x 10-17 m d. 2.0 x 10-10 m e. 3.4 x 10-13 m?

The molar solubility of Fe(OH)₃ in pure water is 2.0x10⁻¹⁰ M.

Explanation:

First, remember that the molar solubility of a compound is the maximum molar concentration of solute in a specific solvent. In this case, the solute is Fe(OH)₃ and the solvent is water.

- To calculate the molar solubility of a compound, we have to start by writing the dissociation reaction and make sure it is balanced. You can check the attachment for better understanding.

- The molar solubility of each dissociated species is represented by the letter "s" and multiply by its coefficient.

- The molar solubility is calculated from the Ksp of a compound. The Ksp is the Solubility Product Constant, so we have to make the product of molar solubility of each specie:

Kps = [Fe⁺³].[OH⁻]³

It is very important to raise to the power indicated by the coefficient the solubility of each specie when we write it in the Ksp equation.

After a few mathematical steps for clearing the solubility "s" we find that the result is 1.96x10⁻¹⁰ M that it is approximately to 2.0x10⁻¹⁰ M.

Note:

The molar solubility has units of molarity which is represented in chemistry by capital letter M not small letter m. Small letter m represents molality in chemistry. Molarity and molality are differents, be careful.

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For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic