Mass A to volume B

Take another look at the pathway between the known mass of substance A and the unknown concentration of substance B with which it reacts. The volume of solution in which B is dissolved is known, and since a concentration is required in the last step, the calculated amount in moles of B is divided by the known volume.

Known

n =	m
	M

n(A)	=	n(B)
a	=	b

m(A)

n(A)

mass of A

Step 1

moles of A

Step 2

c =	n
	V

Unknown

n(B)

c(B)

moles of B

Step 3

concentration of B

A very similar pathway to that above has an unknown volume of B and a known concentration of B. There is only a small difference (in Step 3) between the approach to solving this type of problem and the problem above.