Question

During the reaction of some metal with dilute hydrochloric acid, following observations were made.
A) Silver metal does not show any change
B) The temperature of the reaction mixture rises when Aluminum is added.
C) The reaction of sodium metal is found to be highly explosive.
D) Some bubbles of gas are seen when lead is reacted with acid.
Explain these observations giving suitable reasons.

Answer 1

We will write what the hydrochloric acid is then we will know the behavior of silver with the hydrochloric acid. Then we will know about the reaction of aluminum with HCl. We will know about the reactivity of sodium metal. Then in the end we will see the reaction of lead with the Lead.

Complete solution:
Step1. Hydrochloric acid is HCl. It is a colorless acid and one of the strong acids. It can be very harmful to skin and can work as an oxidizing agent to many non metals.
Step2. The silver is a malleable and valuable metal. It is shiny but it also lies low in the reactivity series. So when it is reacted with the HCl it shows almost no changes.
Stpe3. Aluminum is reactive metal. When it is reacted with HCl the exothermic reaction happens. It releases the energy out and it increases the temperature. So the total reaction temperature is increased.
Step4. The sodium is one of the highest reactive metals. It even reacts with air and water at normal temperature. So when it reacts with the HCl it will release a lot of heat. It turns into the explosion.
Step5. The lead is reacted with the HCl it will produce the chloride of the lead and produce the hydrogen. It is the light gas and forms the bubbles.
Reaction is given below.
$Pb + 2HCl \to PbC{l_2} + {H_2}$

Note: The HCl is used to pickling the steel. It can also remove the rust from the iron. It is also used to make a lot of inorganic and organic compounds. It can be used to regulate the acidity of solutions.