Question

A certain volume of a .50 M solution contains 4.5g of a certain salt. What mass of the salt is present in the same volume of a 2.5 M solution?

Indicate the concentration of each ion/molecule:
A mixture of 50.0 mL of .2M KClO3 and 25.0 mL of a .20M Na2SO4.


How would you answer or set up these two problems?

Answer 1

first one: do by proportion.

4.5g/.5M = X/2.5 M

second one. You have K+, ClO3-, Na+, and SO4-- ions.

I will do one.

concentration of Na+= 2*.2M

Answer 2

4.5g x 5 =22.5g or 23g