Question

What volume in milliliters of concentrated HCl (12 M) is needed to make 1500 mL of a 3.5 M solution?

Answer 1

This process involves the dilution of the 12 molar HCl. To reduce the concentration, we need to set up an equality so that we know how much of the 12M we need to make the 3.5M.

12 moles HCl 3.5 moles HCl
——————— = ———————
1 Liter of Soln ‘x’ Liters of Soln

Notice that the 12 moles over the 1 liter is equal to 12 molar; in doing this, we’re maintaining the concentration of the initial HCl. By setting it equal to the 3.5 over ‘x’, we’re still maintaining the concentration.

After solving, we find that ‘x’ equals 0.292. This value means that in 0.292 liters of our 12 M HCl solution, there are 3.5 moles of HCl. But, we’re not done yet.

0.292 liters of 12 M HCl can make 1 liter of 3.5 M HCl, but the question asks for 1.5 liters. To get this, multiply 0.292 liters by 1.5, and the new result, 0.4375, represents the amount of 12 M HCl required to prepare a 1500 mL 3.5 M HCl solution.

Answer 2

Answer : The volume of 12 M HCl needed to make 1500 ml of a 3.5 M solution is, 437.5 ml

Solution :

According to the neutralization law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of HCl solution = 12 M

$V_1$ = volume of HCl solution = ?

$M_2$ = molarity of solution = 3.5 M

$V_2$ = volume of solution = 1500 ml

Now put all the given values in the above law, we get the volume of HCl solution.

$(12M)\times V_1=(3.5M)\times (1500ml)$

$V_1=437.5ml$

Therefore, the volume of 12 M HCl needed to make 1500 ml of a 3.5 M solution is, 437.5 ml