Problem: A student prepared a stock solution by dissolving 25.00 g of NaOH in enough water to make 150.0 mL of solution. The student then took 20.0 mL of the stock solution and diluted it with enough water to make 250.0 mL of a  solution. The student then took 75.0 mL of this solution and dissolved in water to make a 500 mL solution. What is the concentration of NaOH for this final solution? (MW of NaOH: 40.00 g/mol). a. 2.20 M b. 0.0495 M c. 0.0347 M d. 0.0145 M

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Problem Details

A student prepared a stock solution by dissolving 25.00 g of NaOH in enough water to make 150.0 mL of solution. The student then took 20.0 mL of the stock solution and diluted it with enough water to make 250.0 mL of a  solution. The student then took 75.0 mL of this solution and dissolved in water to make a 500 mL solution. What is the concentration of NaOH for this final solution? (MW of NaOH: 40.00 g/mol).

a2.20 M

b. 0.0495 M

c. 0.0347 M

d. 0.0145 M

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