Reaction of NaOH & Zn vs Zn & HCl: Physical & Chemical Changes

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In summary, when NaOH and Zn react, there are physical and chemical changes, such as the formation of zincate and evolution of H2. This reaction differs from the reaction of Zn and HCl because in the latter, hydrogen is also evolved, but the result is not the same as in the former due to the amphoteric nature of the hydrated zinc ion. There may also be changes in color and deposition of substances in the solutions during these reactions.
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krateesh
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Homework Statement


What are the physical and chemical changes that occur when NaOH and Zn react.?Also how do this reaction differ from the reaction of Zn and HCl?


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The Attempt at a Solution



I do know that zincate is formed in the first and H2 is evolved in the second .But as i have no time to go and perform in the lab...thus please tell me about the colour changes of solution,any deposition,cause and effect of these reactions.
 
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Hydrogen evolves in both. Base results in zincate formation as a consequence of the amphoteric nature of the hydrated zinc ion.
 

1. What is the reaction that occurs between NaOH and Zn?

The reaction between NaOH (sodium hydroxide) and Zn (zinc) is a chemical reaction that produces hydrogen gas and forms sodium zincate (Na2ZnO2) as a byproduct. This reaction is also known as a displacement reaction, as the more reactive metal (sodium) displaces the less reactive metal (zinc) in the compound.

2. What is the reaction that occurs between Zn and HCl?

The reaction between Zn (zinc) and HCl (hydrochloric acid) is a chemical reaction that produces hydrogen gas and forms zinc chloride (ZnCl2) as a byproduct. This reaction is also known as a single replacement reaction, as the more reactive metal (zinc) replaces the less reactive hydrogen in the compound.

3. Are there any physical changes that occur during these reactions?

Yes, there are some physical changes that occur during these reactions. For example, the zinc metal may appear to dissolve in the acid, but it is actually undergoing a chemical change as it reacts with the acid to form a new compound. Additionally, the production of gas bubbles during the reaction is a physical change.

4. What is the difference between a physical and a chemical change?

A physical change is a change in the physical properties of a substance, such as its shape, size, or state, without forming any new substances. A chemical change, on the other hand, involves a chemical reaction where new substances are formed with different properties than the original substances.

5. Can you determine the products of these reactions?

Yes, the products of these reactions can be determined by using the general rule that a metal and an acid will always produce a salt and hydrogen gas. So, the products of the reaction between NaOH and Zn are sodium zincate and hydrogen gas, while the products of the reaction between Zn and HCl are zinc chloride and hydrogen gas.

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