The density of an aqueous solution of HCl that is 20.00 percent by weight is 1.0980. Calculate the molarity (M) of this solution.
i need help for my test....please help me out....
2007-04-06 14:45:33 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Ok, consider 1 liter of this solution. Its mass is 1098 grams. Since 20 percent of this is HCl by weiht, we have 204.9 g of HCl in the solution. Now divide this by the molecular weight of HCl (about 37) for your answer.
2007-04-06 14:51:31 · answer #1 · answered by cattbarf 7 · 1⤊ 0⤋
20% HCl aqueous (w/w) is 6.02 molar.
The molecular weight of HCl = 36.48 grams / mole
1098 x 0.20 = 219.6 grams HCl in 1000 mL of water
219.6 grams / 36.48 grams per mole = 6.02 moles
For more information, including a table of molarity, see:
http://en.wikipedia.org/wiki/Hydrochloric_acid
2007-04-06 22:04:38 · answer #2 · answered by Anonymous · 0⤊ 0⤋