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What is the molarity of a hydrochloric acid solution that is 18.25% HCL by mass & has a density of 1.20g/mL?
help...how do i solve this problem
2 Answers
- Trevor HLv 71 decade agoFavorite Answer
Take 1 litre of this solution:
Mass of this solution = 1200g
18.25% HCl = 18.25/100*1200 = 219g HCl per litre
Molar mass HCl = 36.461g/mol
219g = 219/36.461 = 6.00mol
Molarity of solution = 6.00M
I would like to comment: I do not know where text books ( or teachers?) get these figures. According to my reference an 18.25% HCl solution by mass will have density = 1.090g/ml. Density of 1.20g/ml for this solution is pure imagination. But the above calculation is done in accordance with the given data.
- CynthiaLv 45 years ago
Imagine 1 L of this solution. Use mass = volume (mL) x density (g/mL) to get total mass; multiply by 0.1825 to get g HCl/L Then divide by molar mass HCl to get moles/L, which is what you want. That's it!
