ive been stuck for a week now please help

Question

What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare
100.0 milliliters of a 0.50 M acetic acid solution?

Use the equation

Mconcentrated × Vconcentrated = Mdilute × Vdilute

Answer 1

M1V1 = M2V2

(2.5 M)(x ml) = (0.50 M)(100.0 ml)

x ml = (100.0 ml)(0.50 M)/2.5 M

x = 20. mls (to 2 significant figures)

 

Does this make sense?  It's the same formula that you posted but using slightly different nomenclature.  Here Mconcentrated is M1 and Vconcentrated is V1; Mdilute is M2 and Vdilute is V2.