Given the concentration and volume of a solution of A
Find the mass of B

In the preceding problems a given mass of substance A has reacted with a solution of substance B. Either the concentration or the volume of the solution of substance B is known, and the other is calculated as shown in the pathway below.

Known

m(A)
mass of A

n =	m
	M

Step 1

n(A)
moles of A

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

Step 2

n(B)
moles of B

c =	n
	V

Step 3

Unknown
c(B)
or
V(B)
concentration or
volume of B

If A is used in solution, the calculation still has as its central point the conversion between amounts in moles of A and moles of B, but the mass-molar mass relationship is used in Step 3, and the volume-concentration relationship is now used in Step 1.

Known

c(A) and V(A)
concentration
and volume of A

n = c × V

Step 1

n(A)
moles of A

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

Step 2

n(B) moles of B	m = n × M Step 3	Unknown m(B) mass of B

n(B)
moles of B

m = n × M

Step 3

Unknown

m(B)
mass of B

Given the concentration and volume of a solution of AFind the mass of B

Given the concentration and volume of a solution of A
Find the mass of B