`PCl_(3) + H_(2) O to A + B ` . What are A and B

Options

A. `H_(3) PO_(2) + HCl`
B. `H_(3) PO_(4) + HCl`
C. `H_(3) PO_(3) + HCl`
D. `HPO_3 + HClO_(3)`

Answer

To solve the reaction \( PCl_3 + H_2O \rightarrow A + B \), we need to analyze the reactants and the expected products.

### Step 1: Identify the Reactants
The reactants in this reaction are:
- \( PCl_3 \) (Phosphorus trichloride)
- \( H_2O \) (Water)

### Step 2: Understand the Reaction Type
When phosphorus trichloride reacts with water, it undergoes hydrolysis. Hydrolysis is a reaction where water breaks down a compound, often leading to the formation of an acid and another product.

### Step 3: Predict the Products
In this case, phosphorus trichloride reacts with water to produce:
1. Phosphorus acid (\( H_3PO_3 \))
2. Hydrochloric acid (\( HCl \))

Thus, we can write the reaction as:
\[ PCl_3 + 3H_2O \rightarrow H_3PO_3 + 3HCl \]

### Step 4: Identify A and B
From the products formed:
- \( A = H_3PO_3 \) (Phosphorus acid)
- \( B = HCl \) (Hydrochloric acid)

### Conclusion
The correct answer for the reaction \( PCl_3 + H_2O \rightarrow A + B \) is:
- \( A = H_3PO_3 \)
- \( B = HCl \)

### Final Answer
Thus, \( A \) is \( H_3PO_3 \) and \( B \) is \( HCl \).

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