What is the molarity of 2 mol of #KI# dissolved in 1 L water?
1 Answer
Explanation:
Molarity is simply a measure of concentration.
For a given solution, molarity is calculated by taking into account how many moles of solute you get per liter of solution.
#color(blue)(|bar(ul(color(white)(a/a)"molarity" = "moles of solute"/"liters of solution"color(white)(a/a)|)))#
This means that in order to find a solution's molarity, you essentially need to know two things
- the number of moles of solute
- the total volume of the solution expressed in liters
In your case, you know that the solution has a volume of
So, if you have
#color(blue)(|bar(ul(color(white)(a/a)c = n_"solute"/V_"solution"color(white)(a/a)|)))#
This is equivalent to
#c_(KI) = "2 moles"/"1 L" = color(green)(|bar(ul(color(white)(a/a)"2 mol L"^(-1)color(white)(a/a)|)))#
So keep in mind that every time you're looking for a solution's molarity, you are essentially looking for how many moles of solute you get in one liter of solution.