Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCl concentration by mass and a density of 1.20 g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5 L of 0.500 M HCl?

Answer:

You should use 97 ml of the stock solution and make it up to a volume of 2.5L

Explanation:You need 2.5L of 0.5M HCl solution.

C = nV

So:

n = CV

So the no. moles HCl required = 2.5×0.5=1.25

Now we need to find how many grams this is. We get this by multiplying by the weight of 1 mole of HCl which is equal to its Mr (mass required) in grams.

Mr[HCl]= 34.46

So mass required = 1.25×34.46=43.07g

We know that the concentrated form is 37.0% by mass.

This means that 100g of this concentrated solution contains...