Posted by pete on Sunday, October 10, 2010 at 5:02pm.
The definition of molarity is
M = moles/L of solution.
The secret to the getting the problem right is in how you say it.If you say "add 0.300 mole Ba(OH)2 (which is 171 grams) to 1 L of water" you will get no credit for the problem. If you say "add 171 grams Ba(OH)2 to a 1 L flask, add some water, swirl to dissolve all of the solid, then make to a final volume of 1 L, you will get credit. The difference in the two statements, if you look closely, is that the first will be a solution with MORE THAN 1 L of solution because the Ba(OH)2 occupies some volume so the final volume will not be 1 L. I hope you see the difference.
thank you but how is 171 moles/L equals to 250 mL of the 3.000 M solutions of Ba(OH)2
It isn't. Thank you for the follow up. The 171 g Ba(OH)2 prepares 1 L of 3.00 M solution. To prepare just 250 mL one takes 1/4 of the 171 g.
I became so interested in the fine details of how the solution was prepared that I completely forgot we weren't making a L.
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