Question

12. You want to create a 0. 55M Potassium Chloride solution. You mass 3. 00 grams of Potassium chloride

How much water is needed?

Answer 1

I suppose that you want to produce a 0.25 M solution of KCl

You do not want tp produce 0.25 mol of KCl.

Molar mass KCl = 39.1 + 35.45 = 74.55 g/mol

Mass of 0.25 mol KCl = 0.25 mol * 74.55 g/mol =18.64 g

To produce a 0.25 M solution of KCl = 18.64 g would require a solution volume of 1.0 L or 1000 mL

You have only 5.00 g ( NOT 5.00 gm) of KCl

Volume of solution required = 5 g / 18.64 g * 1000 mL = 268 mL solution

You dissolve the 5 g KCl in some water and then make up the final solution volume to 268 mL

This does NOT mean that you dissolve the 5 g KCl in 268 mL water .