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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Misty on October 08, 2007, 02:11:17 PM

Title: Compounds of copper
Post by: Misty on October 08, 2007, 02:11:17 PM

Hi,

If an aqueous solution of copper(II) nitrate Cu(NO₃)_2(aq) is made from 4.758g of Cu(NO₃)₂^.2.5H₂O_(s), will there also be 4.758g of copper(II) nitrate? Or do I use the equation Cu(NO₃)₂^.2.5H₂O_(s) --> Cu(NO₃)_2(aq) + H₂O

Title: Re: Compounds of copper
Post by: Borek on October 08, 2007, 03:50:22 PM

More like the second approach. Note that you are most likely interested in molar concentration - so you just calculate number of moles of Cu(NO₃)₂^.2.5H₂O(s) - taking water molecules into account when calculating salt molar mass.