It's the lab about "Determining the Empirical Formula of a Compund Containing Copper and Chlorine."So, the brief procedure is.... Obtain copper chloride and mix it with HCl soultion then add solid zinc metal and stir and mix them together until the soliution turn from blue to transparent. Remove unreact zinc from the solution. Remove liquid from copper and dry copper by heating on the evaporating dish.I think the purpose of this lab is just to determine the empirical formula of Copper Chloride.The question is... What's the conclusion and why we do need to mix it with zinc?Plus, what's gonna happen if we removed zinc from the mixture while the solution was still bule?What's gonna happen if we left pieces of zinc in the copper and weighed it together, instead of just weighing copper alone.What's gonna happen if we actually added 7.5 g of zinc but recorded it down as 5.5 g of zinc?Thank you in advance
we find the moles of copper & of chloride by converting the grams of each into moles using molar mass why we do need to mix it with zinc? we add the zinc, to do a single replacement reaction to plate out the coppper , so that we can convert copper's grams into moles (Zn & Cu+2 --> Cu metal & Zn+2) if we removed zinc from the mixture while the solution was still blue? then you will not have extracted all of the copper & the ratio for the empirical formula will be off... the calculated moles of copper will be too small, because you will not have extracted all of the copper... & we would believe the formula had less coppper than it really did What's gonna happen if we left pieces of zinc in the copper and weighed it together, then the mass would be too large, it would be all of the copper plus the added mass of zinc... we would think it would be due to coppper.... & we would believe that the formula had more coppper than it really did What's gonna happen if we actually added 7.5 g of zinc but recorded it down as 5.5 g of zinc? we do not care about the amount of zinc we care about the abount of copper produced.... writing down the wrong mass of zinc would have no effect on the copper chloride formula
