You are asked to make up 50 gallons of 0.5% toxaphene solution. How many pounds of a 25% wettable powder would you add to 50 gallons of water? Give your answer in pounds.

To solve this, we need to determine how many pounds of the 25% toxaphene wettable powder are required to create 50 gallons of a 0.5% solution.

### Step-by-step process:

1. **Determine the amount of toxaphene needed in pounds**:  
   A 0.5% toxaphene solution means 0.5% of the total weight of the solution must be toxaphene.  
   Since 1 gallon of water weighs about 8.34 pounds, the total weight of 50 gallons of water is:
   \[
   50 \times 8.34 = 417 \text{ pounds}
   \]
   To make a 0.5% solution, the amount of toxaphene needed is:
   \[
   0.005 \times 417 = 2.085 \text{ pounds of toxaphene}
   \]

2. **Calculate the amount of the 25% wettable powder**:  
   Since the powder is 25% toxaphene, only 25% of the powder's weight is active toxaphene. Therefore, to find out how much powder is needed to provide 2.085 pounds of toxaphene, we divide by 0.25 (the percentage in decimal form):
   \[
   \frac{2.085}{0.25} = 8.34 \text{ pounds of the 25% wettable powder}
   \]

### Final Answer:
You would need to add **8.34 pounds** of the 25% toxaphene wettable powder to 50 gallons of water.

Would you like further details on any of these steps or calculations?

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Here are 5 related questions to expand on the concept:

1. How would the amount of wettable powder change if you needed a 1% toxaphene solution?
2. How many gallons of a 0.5% solution could you make with 10 pounds of the 25% wettable powder?
3. If the wettable powder was 50% toxaphene instead of 25%, how would the amount change?
4. What is the concentration of toxaphene if 4 pounds of a 25% wettable powder is mixed with 100 gallons of water?
5. How many pounds of toxaphene are in 20 pounds of a 25% wettable powder?

**Tip:** When working with percentage solutions, always convert percentages to decimal form by dividing by 100 before performing calculations.

Learn how to calculate the pounds of a 25% wettable powder required to make 50 gallons of a 0.5% toxaphene solution. This problem involves percentage calculations, unit conversions, and proportional reasoning. Suitable for students in Grades 10-12.

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