What would be the concentration of a solution made by adding 250 ml of water to 45.0 m of 4.2 M KOH?
To find the final concentration, we calculate the moles of KOH initially present in the 45.0 ml solution, then add the moles from the additional 250 ml of water. We then divide the total moles by the final volume (45.0 ml + 250 ml) to get the concentration. The concentration of the final solution would be less than 4.2 M KOH due to dilution when water is added.