1M KCl will require 25 mL to generate 100 mL of 0.25M KCl.
Molarity of a solution is defined as number of moles of solute present in 1000 mL of the solution.
[tex]M=\frac{n}{V}\times1000[/tex]
So molarity is inversely proportional to the volume of the solution.
As solution is diluted. Molarity of the solution decreases.
1M of KCl means 1 mole of KCl in 1000 mL of the solution.
1M KCl is four times as concentrated as 0.25M KCl.
Therefore, to make 100 mL of 0.25M will require [tex]\frac{100}{4}= 25 mL[/tex] of 1M KCl diluted to 100 mL of distilled water.
Easy alternative: Dilution formula
[tex]M_1\times V_1 = M_2\times V_2[/tex]
Where [tex]M_1 \,and\, V_1[/tex] are volume and concentration of first solution
and [tex]M_2\,and\, V_2[/tex] are of second solution.
[tex]1\times V= 0.25\times100\\\\V= 25\,mL[/tex]
Learn more about dilution formula here,
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