Question

Preparation of Copper(I) Chloride

Reactions:

1) Cu(S) + 4HNO₃(aq) -> Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)

2) 2HNO₃(aq) + Na₂CO₃(s) -> H₂O(l) + CO₂(g) + 2NaNO₃(aq)

3)Cu(NO₃)2(aq) + Na₂CO₃(s) -> CuCO₃(s) + 2NANO3(aq)

4)CuCO_3(s) + 2HCL(aq) -> CuCl_2(aq) + H₂O_(l) + CO_2(g)

5)CuCl₂(aq) + Cu(s) -> 2CuCl(s)

Report:

Weight of Copper: 1.067g

Volume of Added Nitric Acid: 5.0mL

Total weight of added Sodium Carbonate: 3.929g

Weight of watch glass and filter paper: 51.204g

Weight of watch glass, filter paper, and CuCl Precipitate: 52.288g

How do I find the following:

Experimental Yield of CuCl:

Theoretical Yield of CuCl:

Percent Yield of CuCl:

Answer 1

Mass of copper = 1.067 g

Moles of copper = (Mass / Molar mass) = ( 1.067 / 63.54) mol = 0.0167 mol

Moles of CuCl = 2 x ( moles of Cu) = 0.0335 mol

Theoretical yield of CuCl = ( Moles x Molar mass) = 3.316 g

Experimental yield of CuCl = ( Mass of watch glass, filter paper & CuCl precipitate ) - ( Mass of watche glass & filter paper)

= (52.288 - 51.204) g

= 1.084 g

Percent yield of CuCl = ( Experimental yield / Theoretical yield) x 100 % = ( 1.084 / 3.316) x 100% = 32.68%