Calculate the volume of `8%` by mass solution of `NaOH (d = 1.34 g//cm^(3))` to prepare 500 ml of `4%` by mass solution of `NaOH (d = 1.24 g//cm^(3))`.

Explanation

To solve the problem of calculating the volume of an 8% by mass solution of NaOH needed to prepare 500 ml of a 4% by mass solution of NaOH, we will follow these steps:

### Step 1: Understand the Definitions
- **8% by mass solution** means that there are 8 grams of NaOH in 100 grams of solution.
- **4% by mass solution** means that there are 4 grams of NaOH in 100 grams of solution.

### Step 2: Calculate the Amount of NaOH Required for the 4% Solution
To prepare 500 ml of a 4% solution:
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