# 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

🤓 Based on our data, we think this question is relevant for Professor Giles' class at VCU.

###### 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

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Dilution concept. If you need more Dilution practice, you can also practice Dilution practice problems.

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Based on our data, we think this problem is relevant for Professor Giles' class at VCU.