Science Buddies: "Ask an Expert"

For my science fair project, I have to dilute 32% Hydrochloric Acid into 0.1 M. I need 1800 ml of 0.1 M Hydrochloric Acid. How would I dilute 32% of Hydrochloric Acid to 0.1 M? Also, would it be safe to store the diluted Hydrochloric Acid in a normal 2 liter soda bottle plastic container? Since I've heard that Hydrochloric acid can be dangerous, I plan on diluting it outside with adult supervision. Thank you in advance.

Hi sciencejess.

This is an excellent chemistry problem. Here's how I would calculate the quantity of 32% HCl required to dilute to 1800 mL. 32% is 32 grams per 100 mL, the molecular weight of HCl is 36.5 g/Mole. 1000 mL = 1 liter. Please note that the units on the numerator and denominator will cancel each other and the final unit is mL of your HCl.

1800 mL x 32 grams/100 mL x Mole Hcl/36.5 grams x 1000 mL/0.1M

Please try this calculation and let me know your answer. If you have not had chemistry yet, please ask questions if you needs additional explanation

Your plan to do the dilution outsideis a good one. Make sure to wear safety glasses and make sure there are no pets or sall children around. Pour the concentrated acid into the water to avoid splashing.

Good luck!

Donna