I always titrated my acids using baking soda. Once the solution stops fizzing, there are no more H+ ions in there, and the solution has become neutral. Don't overshoot this and add it slowly. Dilute your acid with sufficient water otherwise you'll get a sticky paste. Acid to water.
- Mass the acid to be titrated. (don't use too much)
- Dilute with enough water.
- Seperate the baking soda into gram portions and add them, one at a time, with stirring, allowing time for the bubbling to stop.
- Once the bubbling slows down, add half grams or less until the bubbling ceases.
- Add up the mass of NaHCO3 needed to titrate the acid, convert this to moles...
2NaHCO3 + H2SO4 --> Na2SO4 + 2CO2 + 2H2O
- Using that number calculate the number of moles of H2SO4 that reacted with the NaHCO3, convert this to mass.
- Take this mass and divide it by original mass of the H2SO4, multiply it by 100 and you should get the percent.
- For concentration, simply divide the number of moles of acid by the volume (in L for molarity), or g, or whatever you like.
This is quite crude but it's worked for me.
It's best to have an idea of how strong the acid is prior the titration so you can predict how much NaHCO3 you'll need. Most drain cleaners are >90% H2SO4...