Question

What mass of NaCl is needed to make 2.50 L of a 2.20 M of a NaCl Solution?

Answer 1

As we know that molarity=no:of moles/volume

Here no of moles =weight/gram molecular weighn=w/58.5

(gram molecular weight of NaCl is 58.5)

Now given molarity is 2.5M so

2.5=w/58.5*1/2.5

W/58.5=2.5*2.5

W=2.5*2.5*58.5=365.625

Hence weight of NaCl required is 365.625grams