A scientist is preparing a buffered solution requiring a 3:7 ratio of component A to component B. If she uses 420 mL of component B, how many milliliters of component A are needed?

Mon, 04 May 2026 15:01:07 +0000

**Why a 3:7 Ratio Matters—When Balancing Buffered Solutions** In labs and research settings across the U.S., precise chemical mixing isn’t just about accuracy—it’s about reliability and safety. One common calculation scientists face involves maintaining a 3:7 ratio of Component A to Component B in buffered solutions. This balance ensures stability, prevents unwanted reactions, and supports consistent experimental results. Recently, this precise ratio has gained attention as lab equipment remains accessible to home experimenters and small-scale researchers. Understanding exactly how to calculate the needed volume of Component A when Component B is known—and how this ratio fits real-world applications—reveals not just chemistry, but a foundation for trust in results. A scientist is preparing a buffered solution requiring a 3:7 ratio of component A to component B. If she uses 420 mL of component B, she needs 180 mL of component A. This calculation stems from dividing Component B by 7 parts and multiplying by 3—keeping the proportion perfectly balanced. ### Why This Ratio Matters Now