How do you prepare 0.5 n hcl?

To prepare a 0.5 N hydrochloric acid (HCl) solution, first calculate the required volume of concentrated HCl, which has a typical concentration of about 12 N. Use the dilution formula: ( C_1V_1 = C_2V_2 ), where ( C_1 ) is the concentration of concentrated HCl, ( V_1 ) is the volume of concentrated HCl needed, ( C_2 ) is the desired concentration (0.5 N), and ( V_2 ) is the final volume of the solution. Measure the calculated volume of concentrated HCl, carefully dilute it with distilled water to the desired final volume, and mix thoroughly. Always add acid to water, not water to acid, to ensure safety.