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A scientist is conducting an experiment with two chemical solutions. She mixes 150 mL of Solution A with 250 mL of Solution B. If Solution A contains 20% alcohol and Solution B contains 50% alcohol, what is the percentage of alcohol in the final mixture?
This hands-on experiment reflects a common challenge in science and industry: blending solutions with differing concentrations to achieve a desired strength. As interest in precision formulae grows—especially in pharmaceuticals, laboratories, and education—understanding how to calculate mixture concentrations becomes increasingly relevant. Users searching for clear, accurate guides to chemical dilution often look for trustworthy, step-by-step explanations that avoid ambiguity. When comparing two volumes of alcohol-containing solutions, the final concentration isn’t simply the average—it depends on the ratio of each solution and its alcohol content. In this case, 150 mL of Solution A contributes 20% alcohol by volume, while 250 mL of Solution B contributes 50%. Factoring in both volume and percentage allows scientists to predict the mixture’s strength precisely. This principle applies across many real-world contexts, from medical testing to chemical manufacturing. ### How A scientist is conducting an experiment with two chemical solutions. She mixes 150 mL of Solution A with 250 mL of Solution B. If Solution A contains 20% alcohol and Solution B contains 50% alcohol, what is the percentage of alcohol in the final mixture?
To calculate the total alcohol volume, start by finding the alcohol amount in each solution. Solution A: 150 mL × 20% = 30 mL of alcohol. Solution B: 250 mL × 50% = 125 mL of alcohol. Total alcohol = 30 + 125 = 155 mL. Total mixture volume = 150 + 250 = 400 mL. The final percentage is (155 mL alcohol ÷ 400 mL total) × 100, resulting in 38.75% alcohol by volume. This method ensures precision, aligning with best practices in laboratory workflows. This calculation illustrates a fundamental chemistry concept—volumetric mixing—relevant to STEM learners, educators, and professionals needing reliable concentration data. With clear, neutral explanations and precise methodology, this type of content performs strongly on search platforms like{arrayScoreboard
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