Question

The molecular weight of KCI is 75.How much dry reagent (KCI) is needed to make the following solution.
75 ml of a 4M solution

Answer 1

@Luigi0210

Answer 2

@Mertsj

Answer 3

For a 1M solution you would need 75 g KCl in 1 liter of solution
For a 4 M solution you would need 4(75)g KCl in 1 liter of solution
That would be 300 g KCL in 1 liter of solution.
But you want to know how much you need for 75 ml of solution so write:
\[\frac{300g}{1000ml}=\frac{x g}{75 ml}\]

Answer 4

now what?

Answer 5

do i cross multiply

Answer 6

rob can you help me finish