Respuesta :

To solve this we use the equation, 

M1V1 = M2V2

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

2.5 M x V1 = 1.0 M x .250 L

V1 = 0.10 L or 100 mL of the 2.5 M HCl solution is needed

Hope this helps.

Answer: Add 150 ml of water to 100 ml of 2.5 M stock solution.

Explanation: According to the neutralization law,

[tex]M_1V_1=M_2V_2[/tex]

where,

[tex]M_1[/tex] = molarity of stock solution = 2.5 M

[tex]V_1[/tex] = volume of stock solution = ?

[tex]M_2[/tex] = molarity of desired solution = 1.0 M

[tex]V_2[/tex] = volume of desired solution = 250 ml

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

[tex](2.5M)\times V_1=(1.0M)\times (250ml)[/tex]

[tex]V_1=100ml[/tex]

Therefore, 100 ml of 2.5 M of stock solution is taken and 150 ml of water is added to make the volume to 250 ml.

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