How do I determine concentration of hydrochloric acid without using titration method?

The common alternative method is to use a gravimetric method. Measure out an exact volume of the HCl solution. Add AgNO3 to precipitate the Cl- as AgCl. Filter, dry and weigh the AgCl. From the m of AgCl you can find the moles Cl- in the sample - and hence to molarity of the HCl. I ume that you are familiar with these laboratory ytical techniques.