What formula do I use to calculate the mass of KCl that is required to make 625 mL of a 0.200 M solution?
See the other KCl problem to which I responded.
DrBob I tried the formula you gave me and Im still not coming up with the correct answer. The answer has to be in grams and it isnt coming out correct. The answer is 9.3 g and the formula isnt giving me that answer or Im not doing it right. Help please.
To calculate the mass of KCl required to make a certain concentration of solution, you need to use the formula:
mass = molar mass x volume x molarity
In this case, the molar mass of KCl (potassium chloride) is 74.55 g/mol. The volume is given as 625 mL, which needs to be converted to liters (since the molarity is given in moles per liter). So, 625 mL is equal to 0.625 L.
Now, you can substitute the values into the formula:
mass = 74.55 g/mol x 0.625 L x 0.200 mol/L
mass = 9.28 g
Therefore, you would need 9.28 grams of KCl to make a 0.200 M solution in 625 mL.