Solution / Dilution practice

How much solute is needed to create 25mL of 0.05g/mL NaCl solution? (Answer to 2 sig fig)

Tags

NGSS.HS-PS1-7

How much solute is needed to create 2L of a 0.05g/mL dextrose solution?

Tags

NGSS.HS-PS1-7

How much solute is needed to create 10mL of a 1.25%NaOH solution? (answer to 3 sig figs)

Tags

NGSS.HS-PS1-7

How much solute is need to make 0.5 L of 1000ppm KCl solutions?

How much solute would be need to make 2L of a 2.5% (v/v) ethanol solution?

You do a 1/100 dilution of a 400mg/mL NaCl solution. What is the final concentration?

You do a 2-step dilution. In the first step you mix 2mL of your stock with 28mL of water. In the second step you add 10mL of the dilution you created in step one, to 10mL of water.

What is the individual dilution factor in the first step? ​ (a)   What is the individual dilution factor for the second step? ​ (b)   What is the overall dilution factor? ​ (c)   (Hint: Express your dilution factors as simplified fractions.)

• 1/30
• 1/2
• 1/60
• 2/28
• 2/30
• 10/10
• 1/32
• 2/32
• 10/20

You have been asked to make 75 mL of a solution with a ratio of 2:1 glycerol to water. You will add ​ (a)   ​ (b)   of glycerol to ​ (c)   mL of water.

• 50
• mL
• 25
• g
• mg
• 37.5
• 20
• L

You start with a stock solution that has the concentration of 500mg/L. You add 25mL of this solution to 25mL of water. What is the final concentration?