We set up oxidation-reduction daniel cell experiment.
ZnlZn
2+(aq)llCu
2+(aq)lCu
Anode half cell reaction : Zn(s)
Zn
2+(aq) + 2e
- εA° : 0.760V
Cathode half cell reaction : Cu
2+(aq) + 2e
- Cu(s) εA° : 0.340V
Total cell reaction : Zn(s) + Cu
2+(aq)
Zn
2+(aq) + Cu(s) ε°cell : 1.100V
We connected the litmus paper and filter paper to the ends of wires respectively. Litmus paper was moistened with NaCl and filter paper was moistened with phenolphthalein + NaCl . We have taken up 0.1M Cu and Zn. At second replication we have taken up 0.01M Zn. We used NaCl as salt bridge. I have 2 question I couldn't solve .
1- Explain the reason of the color changes in litmus paper and in filter paper moistened with phenolphthalein solution (I didn't understand why voltage changed the colors of papers)
2- Does changing in molarity of Zn effect the voltage?