Title: Dilutions Equation: Practice Quiz #4B (optional)
Course: BTEC-1100-301-302-303-F21 > Section: Module 1 - Calculations and Measurements

Q: You have a 1 M stock. How many mL of stock do you need to make 250 mL of 100 mM solution?
- 25
- 250
- 2.5
A: 25
If right: Correct!
If wrong: That is incorrect. Use C1V1 = C2V2, and solve for V1. Note that your stock is M, and your desired end concentration mM. 1000mM = 1 M.

Q: You have a 50x stock. How many mL of stock do you need to make 100 mL of 1x?
- 2
- 20
- 0.2
A: 2
If right: Correct!
If wrong: That is incorrect. Divide the final volume by the dilution factor.

Q: You have a 20x stock. How many mL of stock do you need to make 100 mL of 1x?
- 5
- 50
- 0.5
A: 5
If right: Correct!
If wrong: That is incorrect. Divide the final volume by the dilution factor.

Q: You have a 100x stock. How many mL of stock do you need to make 500 mL of 1x?
- 5
- 50
- 0.5
A: 5
If right: Correct!
If wrong: That is incorrect. Divide the final volume by the dilution factor.