In a chemistry lab, a solution contains 30% salt. If 10 liters of pure water are added to 20 liters of this solution, what is the new concentration of salt in the mixture?

Mon, 04 May 2026 07:48:48 +0000

**Why the Mystery of Saltwater Mixing Feels More Relevant Than Ever**
In a chemistry lab, a solution contains 30% salt. If 10 liters of pure water are added to 20 liters of this solution, the resulting concentration sparks quiet interest—especially amid growing curiosity about practical science, health, and everyday mix-and-measure habits. This small calculation isn’t just academic; it reflects real-world contexts like food preparation, medical dilutions, and environmental science. As people explore DIY wellness, home experiments, or blog content about liquid chemistry, this problem surfaces naturally—quietly building authority and engagement in mobile-first, US-rich digital spaces. **Why This Question Is Gaining Traction in the US**
Recent trends show rising interest in science education, kitchen chemistry experiments, and health-conscious hydration practices. Adding water to saline solutions appears in home-schooling chemistry kits, fitness recovery drink planning, and even in basic water purification discussions. The clarity and simplicity of the salt mix problem makes it an accessible entry point for those curious about concentration physics—turning a basic calculation into a gateway question. Search volume for similar “saltwater concentration” problems spikes in mobile searches during home science trends, aligning with US readers exploring real-life chemistry. **How 20 Liters of 30% Salt Solution Transforms with Pure Water**
When 10 liters of pure water combines with 20 liters of 30% salt solution, the total volume becomes 30 liters. The amount of salt remains constant—subtracting no salt, only diluting with water. Calculating the new concentration starts with dividing the original salt weight by the new total volume. The salt mass is 30% of 20 liters—6 liters worth—diluted across 30 liters. This results in a new concentration of 20%, or 0.20, expressed as a percentage. The math is precise, accessible, and reinforces core principles of proportionality in fluid mixtures. **Common Questions Clarified**
**H3: Does adding pure water change the salt content?**
No, it doesn’t add or remove salt—only the total liquid volume changes. Salt stays the same while the mixture grows, lowering the concentration.
**H3: What happens to salt concentration after dilution?**
It decreases. Diluting a solution spreads the same amount of solute across more fluid, reducing its relative percentage.
**H3: Is this the same as increasing salt concentration?**
No, it’s the opposite process—adding water always lowers concentration.