You are given a 2.5 L beaker of water and asked to make a 1 M solution of acetic acid crystal. How much acetic acid crystal will you need to add?
You have 9.0 g of CaCl2(s) crystals and you have to make it into a 3.0 M aqueous solution. How much water do you add?

Question

You are given a 2.5 L beaker of water and asked to make a 1 M solution of acetic acid crystal. How much acetic acid crystal will you need to add?
You have 9.0 g of CaCl2(s) crystals and you have to make it into a 3.0 M aqueous solution. How much water do you add?

australopithecus · Answer

M stands for molarity

Molarity = Moles/Liters
so for the first question
1M = x Moles/2.5L

once you have moles use the formula

Moles = grams/molecular mass and solve for grams using he molecular mass of acetic acid and the moles you determined from the first equation

The other question just apply the molarity formula and solve for Liters, then just say add 9.0grams of calcium chloride and then fill up to x liters