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November 01, 2025, 01:01:42 pm
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Author Topic: calculating concentration help  (Read 1030 times)  Share 

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Comatose

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calculating concentration help
« on: August 28, 2011, 09:37:42 pm »
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this is probably an easy question but i have no idea what to do
calculate the concentration of copperII sulfate in 1L of solution containing 200g CuS04.5H20
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Re: calculating concentration help
« Reply #1 on: August 28, 2011, 09:41:30 pm »
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find mol of CuS04.5H20 by dividing the mass by the molar mass of CuS04.5H20. then divide by the volume (in L) i.e. divide by 1
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Comatose

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Re: calculating concentration help
« Reply #2 on: August 28, 2011, 09:49:38 pm »
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i dont think i did it right haha
nCuSO45H20 = 200/186
the answer says 0.8mol L-1
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Re: calculating concentration help
« Reply #3 on: August 28, 2011, 09:52:08 pm »
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molar mass of cuso4 = around 160gmol^-1
add 5*18 for the 5 water molecules
that gives 160+90=250
200/250=0.8M
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Re: calculating concentration help
« Reply #4 on: August 28, 2011, 09:55:09 pm »
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oh LOL my bad haha i just multiplied 5 x 2 =10 then plus 16 for oxygen
cheers
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