Astudent pipets 10 ml of a 0.0693 m solution of kbr into a 500 ml volumetric flask and dilutes to the mark. what is the concentration of the resulting solution?

The initial concentration of solution is 0.0693 M. The volume of solution taken is 10 mL and it is diluted to a final volume of 500 mL.

According to dilution law, the product of initial concentration and volume is equal to the product of final concentration and volume as follows:

Here, is initial concentration, is final concentration, is initial volume and is final volume.

Rearranging to calculate final concentration,

Putting the values,

Therefore, concentration of the resulting solution is 0.001386 M.

the answer for sodium is 0.186

the answer for rubidium is 0.251

i just learnt this recently but i need to look through my notes again