When 25g of an active ingredient is combined with 250 mL of water, what's the strength?

To calculate the strength of the solution, you can use the following formula:

\[
\text{Strength (\% w/v)} = \left(\frac{\text{Mass of solute (g)}}{\text{Volume of solution (mL)}}\right) \times 100
\]

Here, the mass of the active ingredient (solute) is 25 grams, and the volume of the solution (water) is 250 mL.

\[
\text{Strength (\% w/v)} = \left(\frac{25 \text{ g}}{250 \text{ mL}}\right) \times 100 = 10\%
\]

So, the strength of the solution is **10% w/v**.

Would you like more details or have any questions?

Here are 5 related questions:
1. How would the strength change if you doubled the amount of water?
2. What is the strength if only 20 grams of the active ingredient is used?
3. How do you calculate strength if the solute is measured in moles instead of grams?
4. What is the concentration in mg/mL?
5. How would you prepare a 5% solution using the same active ingredient?

**Tip:** Always ensure the units used in the formula are consistent to avoid calculation errors.

Learn how to calculate the strength of a solution containing 25 grams of an active ingredient in 250 mL of water. This problem covers solution concentration concepts, specifically percentage (w/v) calculation. Suitable for high school students and chemistry enthusiasts.

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