>>12577929This is a basic dilution.
Therefore is a simple dilution formula you can use (M1) x (V1) = (M2) x (V2)
where M is the concentration and V is the volume
(5.5%) x (1000 mL) = (4%) x (V2)
Then you do the math and solve for V2
V2 = 1375 mL
So to make a solution of 4% acetic acid solution from 5.5% stock solution, you take 1000 mL of 5.5% solution and add water until the final volume is 1375 mL and you should have your final 4% solution.
