A scientist mixes 250 mL of a 40% saline solution with 150 mL of a 20% saline solution. What is the concentration of the resulting solution? - Sterling Industries
An expert mixes 250 mL of a 40% saline solution with 150 mL of a 20% saline solution—what is the concentration of the resulting mixture?
An expert mixes 250 mL of a 40% saline solution with 150 mL of a 20% saline solution—what is the concentration of the resulting mixture?
Amid growing interest in precision chemistry and everyday health decisions, a common question arises: when 250 mL of a 40% saline solution is carefully combined with 150 mL of a 20% saline solution, what is the final concentration—critical information for understanding hydration, medical protocols, or industrial applications? The blending of accurately measured saline concentrations isn’t just academic; it matters for anything from laboratory work to medical treatment, affecting efficacy and safety. In the US, where science literacy and practical health awareness are rising, this calculation reflects both curiosity and real-world relevance—and offers a clear example of how volume and concentration interact in measurable, meaningful ways.
To understand the concentration of the resulting solution, we combine known volumes and concentrations using the basic formula: total salt divided by total volume. From the 250 mL of 40% saline, the salt content is 250 mL × 0.40 = 100 mL of dissolved salt. For the 150 mL of 20% saline, the salt is 150 mL × 0.20 = 30 mL of salt. Adding these together gives 100 mL + 30 mL = 130 mL of salt in a combined volume of 250 mL + 150 mL = 400 mL. Dividing salt by volume yields a final concentration of 130 mL ÷ 400 mL = 0.325, or 32.5%.
Understanding the Context
This practical equation—what scientists call dilution—explains why mixing solutions changes their strength. The resulting 32.5% saline solution lies between the two originals, reflecting a balanced dilution based on volume proportions. While neither concentration is weak nor overly strong, this 32.5% value highlights precise mixing critical in scientific, medical, and industrial contexts where accurate formulation determines outcomes.
In the US, this calculation isn’t just theory—it supports understanding of everything from home first aid to hospital-grade saline use. Knowing how concentration changes through mixing helps users evaluate hydration solutions, medication dilutions, and even lab experiments. While simple in principle, the exact math underscores the importance of accuracy in concentration work, reinforcing reliable, informed decision-making.
Despite its straightforward nature, this salinity mix offers subtle insight into broader science and health trends: increasing consumer awareness, evolving home care practices, and growing comfort with data-driven choices. Users navigating health or technical needs benefit from grasping how volumes and percentages combine logically—building confidence in both everyday tasks and complex science applications.
For those curious about saline concentration results, this mix demonstrates precision matters. The accurate final concentration of 32.5% doesn’t come
