A CHM 125 student added a single piece of copper metal to test tube containing 2

Question

A CHM 125 student added a single piece of copper metal to test tube containing 2 mL of 6 M HNO_3 (colorless) in the fume hood. The student then observed the formation of tiny bubbles of a clear-colorless gas. (a) Based on experimental observation above, determine the molecular formula of that was observed as a product in the above reaction. Write the molecular formula on the line below. The molecular formula of the clear-colorless gas is ________ (b) Based on experimental observation above, determine the balanced net ionic equation for the "REDOX" reaction that occurred. Write your work in the space immediately below and also write your final answer for the balanced net ionic equation in the space provided at the bottom of the page.

Explanation / Answer

a) Cu(s) + 2HNO3(aq) -------> Cu(NO3)2(aq) + H2(g)

The gas produced is Hydrogen

Molecular formula of Colorless gas is H2

b) Cu(s) ---------> Cu2+(aq) + 2e Oxidation

2 H+ (aq) + 2NO3 (aq) + 2e --------> 2NO3- (aq) + H2(g) reduction

Net ionic equation

Cu(s) + 2H+(aq) ----------> Cu2+(aq) + H2(g)

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