When borax is dissolved in water:

Options

A. `B(OH)_(3)` is formed only
B. `[BH_(2)(NH_(3))_(2)]^(+) [BH_(4)]^(-)` is formed only
C. both `B(OH)_(3)` and `[B(OH)_(4)]^(-)` are formed
D. `[B_(3)O_(3)(OH)_(4)]^(-)` is formed only

Explanation

To solve the question "When borax is dissolved in water, what is formed?", we can follow these steps:

### Step 1: Identify the Chemical Formula of Borax
Borax is chemically represented as Na₂B₄O₇.

**Hint:** Remember that borax is a sodium borate compound.

### Step 2: Understand the Dissolution Process
When borax is dissolved in water, it dissociates into its constituent ions.

**Hint:** Think about how ionic compounds behave in water.

### Step 3: Write the Dissociation Reaction
Upon dissolving in water, borax dissociates to form sodium ions (Na⁺) and borate ions (B₄O₇²⁻).

**Hint:** Focus on the ions produced from the dissolution of borax.

### Step 4: Reaction with Water
The borate ions (B₄O₇²⁻) can react with water to form boric acid (H₃BO₃) and sodium hydroxide (NaOH).

**Hint:** Consider the products of the reaction between borate ions and water.

### Step 5: Write the Overall Reaction
The overall reaction can be summarized as:
\[ \text{Na}_2\text{B}_4\text{O}_7 + \text{H}_2\text{O} \rightarrow 2\text{NaOH} + \text{H}_3\text{BO}_3 \]

**Hint:** Make sure to balance the number of atoms on both sides of the equation.

### Step 6: Identify the Main Product
From the reaction, we see that the main products formed are sodium hydroxide (NaOH) and boric acid (H₃BO₃). However, the question specifically asks for what is formed when borax is dissolved in water.

**Hint:** Focus on the significant product that is often highlighted in such questions.

### Conclusion
When borax is dissolved in water, it primarily forms boric acid (H₃BO₃), which can also be represented as BOH₃.

**Final Answer:** The primary product formed when borax is dissolved in water is H₃BO₃ (boric acid).

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