A strip of zinc metal is placed in a test tube with HCI. Bubbles begin to form o

Question

A strip of zinc metal is placed in a test tube with HCI. Bubbles begin to form on the surface of the metal and eventually the metal strip disappears. Is zinc or hydrogen more reactive? List two hazards of the HCl that we are working with in this lab. The SDS for HCI can be found at www.flinnsci.com/msds-search aspx. Search for hydrochloric acid. Why is it important to wait at least 10 minutes before concluding that no reaction occurred? A strip of gold foil is placed into a blue solution of CuSO_4. After sitting for 15 minutes the foil is still gold in color and the solution is still blue. Is gold or copper the more reactive of the two metals?

Explanation / Answer

1.

Zinc is oxidised by HCl to form zinc chloride.

The net ionic reaction is given by:

Zn(s) + 2H+ Zn2+(aq) + H2(g)

So hydrogen is more reactive than zinc.

2.

skin contact:

corrosive, can cause redness, irritation and severe burns. concentrated form can cause ulcers and discolor skin

inhalation:

inhalation can cause coughing, choking, inflammation of throat, nose and upper respiratory tract.

3.

Because reactions can be slow under ordinary lab conditions. So to see any observable effect of the reaction we should atleast wait for 10 min.

4.

No. As no reaction occurs, gold or silver are not the more reactive of metals

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