How to Calculate Molarity?, Help!!!
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 Mar 2 2011, 09:37 PM, updated 15y ago
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#1
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak   
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Hi there everyone.
I am facing a problem with Chemistry. Here is the situation: I have 1.5 cubic decimetres of sulphuric acid. There is nothing written on the label, except for the name of the acid and 98 g/mol. With those given information, can I find out the molarity/concentration of the acid? Your help is very much appreciated! Thank you... |
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Mar 2 2011, 09:55 PM
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#2
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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Do MOLAR MASS and NUMBER OF MOLES mean the same thing???
Added on March 2, 2011, 9:58 pm QUOTE(Angel01 @ Mar 2 2011, 09:39 PM) number of mole= mv/1000 What I have is molar mass (g/mol) and not number of moles...u Got number of mole, u got volume.  The formula mv/1000 will give the answer in mol and not g/mol. Omg...pening pening...  This post has been edited by bb100: Mar 2 2011, 09:58 PM |
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Mar 2 2011, 10:07 PM
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#3
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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QUOTE(Angel01 @ Mar 2 2011, 10:01 PM) no.... LOL Sorry...but I do not understand your explanations.Courtesy of my fiancee, Volume = 1.5 dm^3 number of mole change from the 98 g/mol... then u need find m from the formula mv/1000. Can you please provide an example? Thank you... |
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Mar 2 2011, 10:28 PM
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#4
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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Please verify if this is correct...
Num of mole = 98, volume = 1.5 dm3. So molarity = mol/v = 65.333 mol/dm3. This post has been edited by bb100: Mar 2 2011, 10:29 PM |
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Mar 2 2011, 10:39 PM
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#5
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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Ohh....
How to change it to mol? |
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Mar 2 2011, 10:59 PM
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#6
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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QUOTE(k-bkeat @ Mar 2 2011, 10:55 PM) omg. this is very simple. I know it is simple...I suggest u get a reference book like sasbadi/success/focus. Those are good at my times. That's Form 4 Chemistry, for god's sake... |
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Mar 2 2011, 11:05 PM
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#7
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Senior Member
1,439 posts Joined: Jan 2011 From: Ipoh, Perak
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QUOTE(cyewe @ Mar 2 2011, 11:03 PM) just need the mass of the solution. coz u take the mass/molar mass(96g) = mole then u take the mole/volume(1.5dm^3) Thanks a lot!!! or just take the mass/volume(1.5dm^3)  |
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