A scientist mixes 100 mL of a 25% saline solution with 200 mL of a 10% saline solution. What is the concentration of the resulting mixture?

Wed, 06 May 2026 16:25:01 +0000

**A scientist mixes 100 mL of a 25% saline solution with 200 mL of a 10% saline solution. What is the concentration of the resulting mixture?**
Understanding how solutions combine is essential across scientific and everyday contexts. A common question in chemistry and health education is: what happens when saline solutions of different strengths are mixed? This practical calculation helps clarify concentration dynamics in fluid mixtures. When a scientist combines 100 mL of a 25% saline solution with 200 mL of a 10% saline solution, the process follows the principle of mass-weighted averaging based on volume. The resulting mixture’s concentration depends directly on the proportions and strengths of each input. **Why This Mix is Gaining Attention**
In recent U.S. educational and health communication circles, simplified science demonstrations like this mixture are drawing interest. They illustrate how mixing fluids affects concentration—relevant not only in labs but in hydration, medical care, and everyday health awareness. The rise in accessible science content reflects a growing public curiosity about chemistry’s real-world applications. **How the Concentration Is Calculated**
To determine the final concentration:
1. Compute milliliters of saline per solution: 100 mL at 25% delivers 25 mL of salt.
2. The 200 mL 10% solution contributes 20 mL of salt.
3. Total volume: 100 mL + 200 mL = 300 mL.
4. Total salt: 25 mL + 20 mL = 45 mL.
5. Final concentration: (45 mL salt ÷ 300 mL total) × 100% = 15%.