Question

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO3)3, to 1.00 L of water. Which statement about the solution is correct?a. The solution is basicb. The solution is acidic.c. The solution is neutral.d. The value of K_a for the species in solution must be known before a prediction can be made. e. The value of K_b for the species in solution must be known before a prediction can be made.

Answer 1

Answer:

Option b is correct.

Explanation:

When $Fe(NO_3)_3$ is dissolved in water, $Fe(OH)_2$ and $HNO_3$ are formed.

$Fe(NO_3)_3\; + 3H_2O \leftrightharpoons Fe(OH)_2\; + HNO_3$

As $Fe(OH)_2$ is an weak base and $HNO_3$ is a strong acid, the resulting solution will be acidic in nature.

if K_b value is known, then pH of the solution can also be determined which will support prediction.

However, acidic and basic nature of the solution can be predicted without K_b value also.

So, among the given option, (b) is correct.