Remember volume = 0.250 L. Find molar mass of NaOH which is approx 23 + 16 + 1 = 40 g/mol. 1 ml of 0.1 M hydrochloric acid is equivalent to 0.005611 g of KOH. How to prepare 1 Step 1 (First day calculation, 10 pts): ml. This molarity calculator is a tool for converting the mass concentration of any solution to molar concentration (or recalculating grams per ml to moles). prepare How to prepare 0.01N wt. Answer (1 of 2): Since water is about 1g/mL. It means, to prepare 1 liter solution, we have to dissolve the solute equal to the equivalent weight of the solute in grams. How to make 1mM KCL and 1mM MgCl2