Question

4. You have a 1 M solution of KCl. You need to generate 100 mL of 0.25 M KCl. Explain how you would make this

Answer 1

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.

$M=\frac{n}{V}\times1000$

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 $\frac{100}{4}= 25 mL$ of 1M KCl diluted to 100 mL of distilled water.

Easy alternative: Dilution formula

$M_1\times V_1 = M_2\times V_2$

Where $M_1 \,and\, V_1$ are volume and concentration of first solution

and $M_2\,and\, V_2$ are of second solution.

$1\times V= 0.25\times100\\\\V= 25\,mL$

Learn more about dilution formula here,

brainly.com/question/18917740

#SPJ4