Nit Hy Beryllium Be Magnesium MgS Lab 5: Copper to Copper CHEM& 121 Andrewsky (a

Question

Nit Hy Beryllium Be Magnesium MgS Lab 5: Copper to Copper CHEM& 121 Andrewsky (adapted from Lucas and Ansell) PRE-LAB QUESTIONS 1. (2 pts) Attach your purpose and procedural outline to this lab handout. 2. Complete all of the skeleton equations (reactions #1-5 in the spaces provided below by writing: . (2 pts) Chemical formulas for each substance reacted and produced. .( pt) States of matter in the parentheses . (4 pts) Coefficients to balance the reactions Please note that copper'll) means the copper ion has a 2+ charge (Cu') R. 5: (1 pt) How will you calculate the percent recovery of copper from the initial amount you started with and the amount you ended with? Prov ide an equation in the space below. 3.

Explanation / Answer

1. The experiment is to test the recovery of Cu by a series of reactions.

2. Equations

R. 1 : Cu(s) + 2HNO3(aq) ---> Cu(NO3)2(aq) + H2(g)

R. 2 : Cu(NO3)2(aq) + 2NaOH(aq) ---> Cu(OH)2(s) + 2NaNO3(aq)

R. 3 : Cu(OH)2(s) --> CuO(s) + H2O(g)

R. 4 : CuO(s) + H2SO4(aq) --> CuSO4(aq) + H2O(l)

R. 5 : CuSO4(aq) + Zn(s) --> Cu(s) + ZnSO4(aq)

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4. Initial amount of copper = x g

recovered mass of copper after step 5 = y g

Percent yield of recovery = (y/x) g x 100

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