Salt from second solution: \(250 \, \text{mL} \times 0.40 = 100 \, \text{mL salt}\)

February 22, 2026

$Salt from second solution: \(250 \, \text{mL} \times 0.40 = 100 \, \text{mL salt}\)$

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#### 455 units
A chemistry student prepares a solution by mixing 150 mL of a 20% salt solution with 250 mL of a 40% salt solution. What is the concentration of salt in the resulting mixture?
Salt from first solution: \(150 \, \text{mL} \times 0.20 = 30 \, \text{mL salt}\)
Total salt: \(30 \, \text{mL} + 100 \, \text{mL} = 130 \, \text{mL salt}\)
Total volume: \(150 \, \text{mL} + 250 \, \text{mL} = 400 \, \text{mL}\)
Concentration: \(\frac{130 \, \text{mL}}{400 \, \text{mL}} = 0.325 = 32.5\%\)

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