# Copper To Copper Lab-2246971

Pre-Lab Questions

1. Balanced equation
2. Cu + 4 HNO3 = Cu (NO3)2 + 2 NO2 + 2 H2O
3. Cu (NO3)2 + 2 NaOH = Cu (OH)2 + 2 NaNO3
4. Cu (OH)2 = Cu O + H2O
5. Cu O + H2SO4 = CuSO4 + H2O
6. CuSO4 + Zn = Cu + ZnSO4
7. Type of reaction
• There are two categories of Litmus Paper: Red Litmus Paper and Blue Litmus Paper. Acidic material turns the blue litmus paper into red. Whereas, if the material is alkaline or basic then the red litmus paper turns blue in nature.
• Nitric acid (concentrated) is highly corrosive and oxidizing in nature and hence, it is essential to wear protective goggles or say use face shield. Must use fume hood and also do check glass apparatus twice before using. Also, the produces nitrogen dioxide gas is highly toxic which means it is imperative to completely dissolve it in water or else use glass wool in the neck of flask to control any possible diffusion of remaining nitrogen oxide.

Observations

Analysis and Interpretation

1. A. Copper is less active as compared with zinc. Also, zinc has higher tendency of being oxidized as compared with copper. Therefore, Zin reacts with sulfuric acid but not with the copper.

B. Magnesium can be used in place of zinc. However, sodium cannot be used because sodium catches fire in aqueous medium and reacts violently. Hennce, Na cannot be used.

C. The reaction rate is directly proportional to the surface area of the reactants. Here, if lump of zinc is used then it slower the reaction rate and therefore, in order to increase the surface area of the reactant powered zinc is used.

•  Considering that all molecules reacted completely then the mass of copper that should be recovered at the end of the reaction would be equal to the initial mass of the copper which is 0.10 grams.
•  Reaction A: Cu + 4 HNO3 = Cu (NO3)2 + 2 NO2 + 2 H2O is not double displacement reaction because in this reaction copper gets oxidized and the nitrogen is reduced which means this is redox reaction and not double displacement.
• The best suitable procedure to recover the copper (II) oxide is to just heating the solution till the complete black solid observed rather than treating it with the sulfuric acid. Further, filter paper can be used to filter out the black solid copper in the form of precipitate.
• In reaction E: CuSO4 + Zn = Cu + ZnSO4, zin replaces Cu2+ ions and hence, the liquid portion has both these ions Cu2+ and Zn2+.