Question

how will you prepare 0.5N HCL in 100ml water solution than formula
​

Answer 1

So to make approximately 0.5N hydrochloric acid, you dilute the conc. HCl 24 times. To make a litre, you'd measure 42 ml of the conc. acid (because 1000/24=41.7) and add it to about 800 ml of water.