Question

A student takes a measured volume of 3.00 MHCl to prepare a 50.0 mL sample of 1.80 M HCl. What volume of 3.00 M HCl did the student use to make the sample?

Answer 1

Volume of 3M solution: x
Moles in 3M solution: 3x

C = n/V
1,8 = 3x/0,05dm³
0,09 = 3x
x = 0,03dm³

A student need 0,03dm³ 3M HCl and 0,02dm³ of water.