*~Unique~*
New Member
Alright, I have conducted an experiment about electrochemical cells. The cell is:
Zn<SUP>2+</SUP>/Zn // Cu<SUP>2+</SUP>/Cu
A zinc metal electrode is placed in a solution of zinc nitrate [Zn(NO<SUB>3</SUB>)<SUB>2</SUB>], this is one half-cell. The other half-cell consists of a copper metal electrode placed in a copper nitrate [Cu(NO<SUB>3</SUB>)<SUB>2</SUB>] solution.
To the copper nitrate solution, sodium sulfide (Na<SUB>2</SUB>S) is added.
A black precipitate is formed because the copper ions, Cu<SUP>2+</SUP>, in the solution react with the sulfide ions, S<SUP>2-</SUP>, to produce insoluble copper sulfide (CuS). According to the following equation:
Cu(NO<SUB>3</SUB>)<SUB>2</SUB>(aq) + Na<SUB>2</SUB>S(aq) ® NaNO<SUB>3</SUB>(aq) + CuS(s)
This is right, no?
The voltmeter reading is ~0.1V. This reading is for the reaction between what exactly? Is it the reaction between the NaNO<SUB>3</SUB> and the zinc metal?
Can someone please tell me (or write) what reaction is causing the reading on the voltmeter.
I also need to write the reactions for the anode and cathode for this cell. Can someone please help me with that also.
Much appreciated,
Kira
<O
</O
PS. This is due Tuesday, please post before then. THANKYOU!!
Zn<SUP>2+</SUP>/Zn // Cu<SUP>2+</SUP>/Cu
A zinc metal electrode is placed in a solution of zinc nitrate [Zn(NO<SUB>3</SUB>)<SUB>2</SUB>], this is one half-cell. The other half-cell consists of a copper metal electrode placed in a copper nitrate [Cu(NO<SUB>3</SUB>)<SUB>2</SUB>] solution.
To the copper nitrate solution, sodium sulfide (Na<SUB>2</SUB>S) is added.
A black precipitate is formed because the copper ions, Cu<SUP>2+</SUP>, in the solution react with the sulfide ions, S<SUP>2-</SUP>, to produce insoluble copper sulfide (CuS). According to the following equation:
Cu(NO<SUB>3</SUB>)<SUB>2</SUB>(aq) + Na<SUB>2</SUB>S(aq) ® NaNO<SUB>3</SUB>(aq) + CuS(s)
This is right, no?
The voltmeter reading is ~0.1V. This reading is for the reaction between what exactly? Is it the reaction between the NaNO<SUB>3</SUB> and the zinc metal?
Can someone please tell me (or write) what reaction is causing the reading on the voltmeter.
I also need to write the reactions for the anode and cathode for this cell. Can someone please help me with that also.
Much appreciated,
Kira
<O
</OPS. This is due Tuesday, please post before then. THANKYOU!!