General Chemistry

Question

35.0 ml of a 1.25 sodium hydroxide solution is diluted with water to a final volume of 55.0 ml. What is the new molarity?

Answer 1

Hello Nicole. I am happy to help.

We know that molarity is the moles of solute per liters of solution. In your problem you would like to know the new molarity after diluting with water.

The amount of solute in the concentrated solution is equal to the amount of solute in the diluted solution.

So we can say M1V1=M2V2

So here is what you know:

Initial : M1= 1.25 V1=35 mL

Final : M2= ? V2= 55mL

Now you can plug into the equation M1V1=M2V2

Rearrange for M2. gives:

M2= M1 X (V1/V2)

M2 = 1.25 (35mL/55mL)

M2=0.795

Please let me know if you have any questions. I am also available if you would like further review in a tutor session.