If you were making 1:25 dilution of a 25mM KCl solution what will be its final concentration?

To calculate the final concentration after dilution, you can use the formula:

C1V1 = C2V2

Where: C1 = initial concentration V1 = initial volume C2 = final concentration V2 = final volume

In a 1:25 dilution, for every 1 part of the solution, you are adding 24 parts of diluent. So, if you start with 1 volume of the 25mM KCl solution, you will end up with 25 volumes in total (1 part of the solution + 24 parts of diluent).

Let's plug the numbers into the formula:

(25mM)(1 volume) = C2(25 volumes)

To solve for C2, divide both sides by 25 volumes:

C2 = (25mM * 1 volume) / 25 volumes = 1mM

So, the final concentration of the KCl solution after a 1:25 dilution would be 1mM.