Question

In locations with very low dissolved O2 concentrations in drinking water, the observed Ksp of ferrous (II) hydroxide will be:

A. slightly smaller.
B. the same.
C. slightly larger.
D. much larger.

Answer 1

The observed Ksp of ferrous (II) hydroxide in locations with very low dissolved O2 concentrations in drinking water will be slightly larger.

Step-by-step explanation:

The observed Ksp of ferrous (II) hydroxide in locations with very low dissolved O2 concentrations in drinking water will be slightly larger.

According to the information provided, Fe(III) exists in an oxygen-containing atmosphere. However, in locations with very low dissolved O2 concentrations, the equilibrium concentration of Fe³+ (aq) will be very low. This low concentration of Fe³+ will cause the Ksp of ferrous (II) hydroxide to be slightly larger.

For example, FeS has a low Ksp value of 4×10-¹⁹, indicating a few Fe²+ or S²- ions in a saturated solution. On the other hand, lead(II) chloride (PbCl₂) has a relatively high Ksp of 1.8 ×10-4, indicating a high concentration of Pb²+ and Cl⁻ ions in a saturated solution.