Question

. The label on a reagent bottle containing concentrated hydrochloric acid says that it is (37% HCl by mass, specific gravity = 1.19). What volume (in mL) of the reagent would you dispense if you need 0.356 moles of HCl?

Answer 1

first find mass of HCl solute needed in gram

no of moles of HCl needed = 0.356 moles , molar mass of HCl = 36.46 gram/mole

mass in gram = no of moles x molar mass substitute values to find mass of HCl solute needed in gram

mass of HCl solute needed in gram = 0.356 x 36.46 = 122.9797 gram HCl solute is needed

given percnt by mass of HCl solute = 37 %

we know formula volume of solution in ml = (mass of solute in gram x 100)/pecent bymass of solute

substitute values to find volume of HCl solution needed in ml

volume of HCl solution needed=(mass of HCl solute in gram x 100)/percent by mass of HCl solute

volume of HCl solution needed = (122.9797 x 100)/37 = 35.08 ml

ans 35.08 ml volume of HCl solution would you dispense if you need 0.356 moles of HCl