Sodium carbonate is a basic salt because it is a salt of

Options

A. strong acid and strong base
B. weak acid and weak base
C. strong acid and weak base
D. weak acid and strong base

Explanation

To determine why sodium carbonate (Na2CO3) is classified as a basic salt, we can follow these steps:

### Step 1: Identify the Components of Sodium Carbonate
Sodium carbonate is composed of sodium ions (Na⁺) and carbonate ions (CO₃²⁻).

### Step 2: Understand the Nature of the Parent Acid and Base
Sodium carbonate is formed from the reaction of sodium hydroxide (NaOH), which is a strong base, and carbonic acid (H2CO3), which is a weak acid.

### Step 3: Analyze the Reaction
The reaction can be represented as:
\[ \text{2 NaOH} + \text{H2CO3} \rightarrow \text{Na2CO3} + \text{2 H2O} \]
In this reaction, the strong base (NaOH) reacts with the weak acid (H2CO3) to form sodium carbonate and water.

### Step 4: Determine the Strength of the Salt
Since sodium hydroxide is a strong base, it completely dissociates in solution. Carbonic acid, being a weak acid, does not completely dissociate. This results in sodium carbonate being a salt that has basic properties.

### Step 5: Conclude the Basic Nature of Sodium Carbonate
Because sodium carbonate is derived from a strong base (NaOH) and a weak acid (H2CO3), it retains basic properties, making it a basic salt.

### Final Statement
Thus, sodium carbonate is a basic salt because it is formed from a strong base (sodium hydroxide) and a weak acid (carbonic acid).

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