Borax is

Options

A. `Na_(2) [B_(4) O_(5) (OH)_(4)] 8 H_(2) O`
B. `Na_(2) [B_4 O_5 (OH)_(6)] 7 H_(2) O`
C. `Na_(2) [B_(4) O_(3) (OH)_(6)] 6 H_(2) O`
D. `Na_(2) [B_(4) O_(2) (OH)_(10) ] 5 H_(2) O`

Answer

To solve the question "Borax is," we need to identify the correct chemical formula and name for Borax. Here’s a step-by-step solution:

### Step 1: Identify Borax
Borax is commonly known as sodium borate. It is a white crystalline compound that is often used in various applications, including cleaning products and as a flux in metallurgy.

### Step 2: Chemical Composition
The chemical composition of Borax can be expressed in several ways. The most commonly recognized formula is that of sodium tetraborate.

### Step 3: Write the Chemical Formula
The chemical formula for Borax (sodium tetraborate) is Na2B4O7·10H2O. This indicates that it contains sodium (Na), boron (B), oxygen (O), and water of crystallization (H2O).

### Step 4: Name the Compound
The systematic name for Borax is Sodium Tetraborate Decahydrate. The "Decahydrate" part indicates that there are ten water molecules associated with each formula unit of sodium tetraborate.

### Conclusion
Thus, Borax is Sodium Tetraborate Decahydrate, with the chemical formula Na2B4O7·10H2O.

### Final Answer
Borax is Sodium Tetraborate Decahydrate (Na2B4O7·10H2O).

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