Q164CP - Chemistry: Molecular Nature Of Matter And Change

Question

When ${\mathbf{\text{Fe}}}^{\mathbf{\text{3 + }}}$ salts are dissolved in water, the solution becomes acidic due to formation of $\mathbf{\text{Fe}}{\left({\text{H}}_{\text{2}}\text{O}\right)}_{\mathbf{\text{5}}}{\mathbf{\text{OH}}}^{\mathbf{\text{2 + }}}$ and ${\mathbf{\text{H}}}_{\mathbf{\text{3}}}{\mathbf{\text{O}}}^{\mathbf{\text{ + }}}$.The overall process involves both Lewis and Brønsted-Lowry acid-base reactions. Write the equations for the process.

Step-by-Step Solution

Answer

The equation of the process is as shown below:

${\text{Fe}}^{3+}+6{\text{H}}_2\text{O}\rightleftharpoons \text{Fe}{\left({\text{H}}_2\text{O}\right)}_6^{3+}.$

$\text{Fe}{\left({\text{H}}_2\text{O}\right)}_6^{3+}+{\text{H}}_2\text{O}\rightleftharpoons \text{Fe}{\left({\text{H}}_2\text{O}\right)}_5{\text{OH}}^{2+}+{\text{H}}_3{\text{O}}^{+}.$

Step 1: Understand the question

The question asks: When Fe 3 + salts are dissolved in water, the solution becomes acidic due to formation of Fe ( H 2 O ) 5 OH 2 + and H 3 O + . The overall process involves both Lewis and Brønsted-Lowry acid-base reactions. Write the equations for the process.

Step 2: Apply Chemistry knowledge

Using fundamental Chemistry concepts to analyze the problem.

Step 3: Formulate the answer

The equation of the process is as shown below: Fe 3 + + 6 H 2 O ⇌ Fe H 2 O 6 3 + . Fe H 2 O 6 3 + + H 2 O ⇌ Fe H 2 O 5 OH 2 + + H 3 O + .

Step 4: Conclude

The answer is: The equation of the process is as shown below: Fe 3 + + 6 H 2 O ⇌ Fe H 2 O 6 3 + . Fe H 2 O 6 3 + + H 2 O ⇌ Fe H 2 O 5 OH 2 + + H 3 O + .