Consider the reaction

[tex]\[ 2 \text{Al(OH)}_3 + 3 \text{H}_2 \text{SO}_4 \longrightarrow X + 6 Y \][/tex]

What are [tex]\( X \)[/tex] and [tex]\( Y \)[/tex]?

A. [tex]\( X = \text{Al}_2(\text{SO}_4)_3 ; Y = \text{H}_2\text{O} \)[/tex]

B. [tex]\( X = \text{Al}_2(\text{SO}_4)_3 ; Y = \text{H}_2 \)[/tex]

C. [tex]\( X = \text{Al}_2(\text{SO}_3)_3 ; Y = \text{H}_2\text{O} \)[/tex]

D. [tex]\( X = \text{Al}_2(\text{SO}_3)_3 ; Y = \text{H}_2 \)[/tex]



Answer :

To identify compounds [tex]\(X\)[/tex] and [tex]\(Y\)[/tex] in the given reaction, follow these steps:

1. Write the Unbalanced Reaction:
[tex]\[ 2 \textrm{Al(OH)}_3 + 3 \textrm{H}_2\textrm{SO}_4 \rightarrow X + 6Y \][/tex]

2. Identify Possible Products:
- Aluminum hydroxide [tex]\( \textrm{Al(OH)}_3 \)[/tex] reacts with sulfuric acid [tex]\( \textrm{H}_2\textrm{SO}_4 \)[/tex].
- Typically, this reaction forms aluminum sulfate and water.

3. Determine the Formula for [tex]\(X\)[/tex]:
- The sulfate ion is [tex]\( \textrm{SO}_4^{2-} \)[/tex].
- Aluminum forms a [tex]\( \textrm{Al}^{3+} \)[/tex] ion.
- Combining [tex]\( \textrm{Al}^{3+} \)[/tex] with [tex]\( \textrm{SO}_4^{2-} \)[/tex] forms [tex]\( \textrm{Al}_2(\textrm{SO}_4)_3 \)[/tex] to balance the charges.

4. Confirm the Formula for [tex]\(Y\)[/tex]:
- Water is commonly formed when hydroxides react with acids.
- [tex]\(Y\)[/tex] is [tex]\( \textrm{H}_2\textrm{O}\)[/tex].

5. Write the Balanced Equation:
[tex]\[ 2 \textrm{Al(OH)}_3 + 3 \textrm{H}_2\textrm{SO}_4 \rightarrow \textrm{Al}_2(\textrm{SO}_4)_3 + 6 \textrm{H}_2\textrm{O} \][/tex]

6. Verify the Balancing:
- There are 2 aluminum atoms on both sides.
- There are 6 oxygen atoms from the hydroxides and 12 from the sulfates, totaling 18 oxygens on the left side. On the right, there are 12 from [tex]\( \textrm{Al}_2(\textrm{SO}_4)_3 \)[/tex] and 6 from [tex]\( 6 \textrm{H}_2\textrm{O} \)[/tex], totaling 18 oxygens, so it balances.
- Hydrogen atoms total 12 on both sides (6 from [tex]\(2 \textrm{Al(OH)}_3\)[/tex] and 6 from [tex]\(\textrm{H}_2\textrm{SO}_4\)[/tex]).
- Sulfate groups balance with 3 sulfates on each side.

The correct products are:
- [tex]\(X = \textrm{Al}_2(\textrm{SO}_4)_3\)[/tex]
- [tex]\(Y = \textrm{H}_2\textrm{O}\)[/tex]

So, the answer is:
[tex]\[ X = \textrm{Al}_2(\textrm{SO}_4)_3; \, Y = \textrm{H}_2\textrm{O} \][/tex]