How prepare 0.1 N HCL?

To prepare 0.1 N HCl solution, dilute 1 volume of concentrated hydrochloric acid (approximately 37% HCl) with 9 volumes of water (distilled or deionized). This will give you a 0.1 N (normal) solution of HCl. Always remember to add acid to water slowly and with good mixing to prevent splattering and to avoid generating excessive heat.