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Topic: Molality Question (Read 3819 times)
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rgoad22
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Molality Question
«
on:
February 04, 2013, 08:39:11 PM »
I'm having trouble with solving this problem. Any suggestions?
Find the concentration of H2SO4 solution in mol/kg if a 10.063 g aliquot of H2SO4 solution required 57.911 grams of NaOH solution to reach the phenolphthalein endpoint.
I tried doing a molar ratio of H2SO4 and NaOH and then doing the necessary conversions but I can't get the right answer.
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Arkcon
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Re: Molality Question
«
Reply #1 on:
February 04, 2013, 10:05:04 PM »
You will need the concentration of the NaOH solution to be known. Once you try it, what answer do you get?
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Hey, I'm not judging. I just like to shoot straight. I'm a man of science.
rgoad22
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Posts: 2
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Re: Molality Question
«
Reply #2 on:
February 04, 2013, 10:17:45 PM »
I have 0.006098 moles of NaOH. So then I divided by 2 for the molar ratio, multplied by the molecular weight of H2SO4, and divided by the given kg of H2SO4 that were used. I got .00301 but the answer should be 0.286 mol/kg :/
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