If you're using 98% sulfuric, there is a slight difference between % by weight and % by volume....but not enough to matter much.
You'd mix about 5 - 5.5 ml of acid to each 100ml of distilled water. This will give you a 4.8 - 5.2% final concentration, which is fine for LCD.
There are methods to determine this exactly, but its really not worth the effort as LCD has a wide range of concentrations in which it will work.
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