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Identify the reaction types in Equations 1, 2, 4, and 5 of Experiment 4. Use \"r

ID: 820094 • Letter: I

Question

Identify the reaction types in Equations 1, 2, 4, and 5 of Experiment 4. Use "redox", "precipitation", "acid-base", and "gas-forming" but use each only once.
step1. converting copper metal to copper (II)nitrate.
step2. Forming solid copper(II)hydroxide from copper nitrate
step4.Returning Cu^2+ ions into solution
step5. Recovering the elemental copper. And why you made these choices? Identify the reaction types in Equations 1, 2, 4, and 5 of Experiment 4. Use "redox", "precipitation", "acid-base", and "gas-forming" but use each only once.
step1. converting copper metal to copper (II)nitrate.
step2. Forming solid copper(II)hydroxide from copper nitrate
step4.Returning Cu^2+ ions into solution
step5. Recovering the elemental copper. And why you made these choices?

Explanation / Answer

Type of reaction (copper cycle),

Step 1 : converting copper metal to copper nitrate

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

Here,

NO2 gas is evolved,

So, it is an gas-forming reaction.

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step 2 : forming copper hydroxide from copper nitrate

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

Here, we form Cu(OH)2 precipitate. Therefore it is an precipitation reaction.

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step 4 : Returning Cu2+ into solution

before going to step 4,

Cu(OH)2 is heated to decompose precipitate into CuO [step 3]

Cu(OH)2(s) --> CuO(s) + H2O(g)

then,

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

This is an acid-base reaction. Acid H2SO4 reacts with base CuO

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step 5 : Recovering elemental copper

CuSO4(aq) is reduced by Zn(s)

CuSO4(aq) + Zn(s) --> ZnSO4(aq) + Cu(s)

Cu in CuSO4 is in +2 state goes to 0 oxidation state in Cu(s)

whereas, Zn in 0 oxidation state in Zn(s) goes to +2 state in ZnSO4.

This is an redox reaction.