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If we have a 37.5% HCl with a density of 1.19g/mol, how can we calculate molarity and normality of the HCl?
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+ Chemistry
+ Hydrochloric acid
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Noah Ater
If we have a 37.5% HCl with a density of 1.19g/mol, how can we calculate molarity and normality of the HCl?
The density — 1.19 g/mL — tells us that one mL of the solution has a mass of 1.19 gms. Therefore 1000 mL of the solution has a mass of 1190 grams.
Now that we know the mass of the solution we can determine the mass of the HCl in a liter. In 1190 gms of solution, 37.5 % is HCl. 1190 x 0.375 = 446.25
So, we have 446.25 gms HCl in a liter of solution. How many moles HCl do we have? The molecular weight of HCl is 36.5. Therefore, we have 446.25 / 36.5 = 12.23 moles HCl in each liter of the concentrated acid.
The molarity of the solution is 12.23. And, since HCl is a monobasic acid, the normality will also be 12.23.
The density — 1.19 g/mL — tells us that one mL of the solution has a mass of 1.19 gms. Therefore 1000 mL of the solution has a mass of 1190 grams.
Now that we know the mass of the solution we can determine the mass of the HCl in a liter. In 1190 gms of solution, 37.5 % is HCl. 1190 x 0.375 = 446.25
So, we have 446.25 gms HCl in a liter of solution. How many moles HCl do we have? The molecular weight of HCl is 36.5. Therefore, we have 446.25 / 36.5 = 12.23 moles HCl in each liter of the concentrated acid.
The molarity of the solution is 12.23. And, since HCl is a monobasic acid, the normality will also be 12.23.
The density — 1.19 g/mL — tells us that one mL of the solution has a mass of 1.19 gms. Therefore 1000 mL of the solution has a mass of 1190 grams.
Now that we know the mass of the solution we can determine the mass of the HCl in a liter. In 1190 gms of solution, 37.5 % is HCl. 1190 x 0.375 = 446.25
So, we have 446.25 gms HCl in a liter of solution. How many moles HCl do we have? The molecular weight of HCl is 36.5. Therefore, we have 446.25 / 36.5 = 12.23 moles HCl in each liter of the concentrated acid.
The molarity of the solution is 12.23. And, since HCl is a monobasic acid, the normality will also be 12.23.
The density — 1.19 g/mL — tells us that one mL of the solution has a mass of 1.19 gms. Therefore 1000 mL of the solution has a mass of 1190 grams.
Now that we know the mass of the solution we can determine the mass of the HCl in a liter. In 1190 gms of solution, 37.5 % is HCl. 1190 x 0.375 = 446.25
So, we have 446.25 gms HCl in a liter of solution. How many moles HCl do we have? The molecular weight of HCl is 36.5. Therefore, we have 446.25 / 36.5 = 12.23 moles HCl in each liter of the concentrated acid.
The molarity of the solution is 12.23. And, since HCl is a monobasic acid, the normality will also be 12.23.
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