A 5.00 mL aliquot of a 0.20 M HCl solution is diluted to a final volume of 25.00 mL. What is the molarity of this first dilution solution? Then a second dilution was made by taking 2.00 mL of the first dilution and diluting it to 50.00 mL. g What is the molarity of this second dilution?

 The molarity of this second dilution is

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

According to the neutralization law,

where,

= molarity of stock  solution = 0.20 M

= volume of stock  solution = 5.00 ml

= molarity of dilute  solution = ?

=  volume of dilute solution = 25.00 ml

The molarity of this first dilution solution is 0.04 M

where,

= molarity of stock  solution = 0.04 M

= volume of stock  solution = 2.00 ml

= molarity of dilute  solution = ?

=  volume of dilute solution = 50.00 ml

The molarity of this second dilution is

yes the answer is total mass in unchanged   : )