How do you calculate molar concentration given that it is a 1:200 aqueous solution and the molecular weight is 165.23?

Question

This is part of a question where you calculate pH given Kb and information above. I just want to know how to calculate the molar concentration of the ephedrine concentration, given that it is a 1:200 aqueous solution and the molecular weight of ephedrine is 165.23. Thanks in advance!

Answer 1

Molar concentration is Molarity or mol/L

 

So in this case you have 1 g of ephedrine in 200 mL water and you need to convert it to mol/L

1g/200 mL*1mol/165.23g * 1000 mL/L= 0.03 M

 

I hope this helps!

Let me know if you have further questions.