What are Reactions of Metals with Salt Solutions?

S6-SA4-0064

Grade Level:

Class 10

AI/ML, Physics, Biotechnology, Space Technology, Chemistry, Engineering, Medicine

Definition

What is it?

Reactions of metals with salt solutions happen when a more reactive metal displaces (pushes out) a less reactive metal from its salt solution. Think of it like a stronger player taking the place of a weaker player in a team. This is a type of displacement reaction.

Simple Example

Quick Example

Imagine two friends, Rohan and Sameer, both want to play with a new cricket bat. If Rohan is stronger and takes the bat from Sameer, Rohan is more 'reactive' than Sameer. Similarly, if you put an iron nail into a copper sulfate solution, the more reactive iron will take the 'sulfate' from the less reactive copper, forming iron sulfate and leaving copper behind.

Worked Example

Step-by-Step

Let's see what happens when Zinc metal reacts with Copper Sulfate solution.

1. Identify the metals involved: Zinc (Zn) and Copper (Cu).
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2. Recall the reactivity series: Zinc is more reactive than Copper.
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3. Since Zinc is more reactive, it will displace Copper from its salt solution (Copper Sulfate).
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4. The Zinc will combine with the sulfate part to form Zinc Sulfate, and Copper metal will be left out.
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5. Write the word equation: Zinc + Copper Sulfate --> Zinc Sulfate + Copper
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6. Write the chemical equation: Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)
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ANSWER: Zinc sulfate solution and solid copper are formed.

Why It Matters

Understanding these reactions is crucial in fields like metallurgy, where we extract metals from their ores, and in preventing corrosion of metals used in bridges or vehicles. Chemical engineers use this knowledge to design processes for metal refining, and materials scientists develop new alloys based on metal reactivity.

Common Mistakes

MISTAKE: Assuming any metal can displace any other metal from its salt solution. | CORRECTION: Only a more reactive metal can displace a less reactive metal. Always refer to the reactivity series.

MISTAKE: Confusing the product metals. | CORRECTION: The more reactive metal becomes part of the new salt solution, and the less reactive metal is obtained in its elemental form (as a solid).

MISTAKE: Not balancing the chemical equation correctly. | CORRECTION: After writing the reactants and products, ensure the number of atoms of each element is the same on both sides of the arrow.

Practice Questions

Try It Yourself

QUESTION: What happens when a Silver spoon is dipped in Copper Nitrate solution? | ANSWER: No reaction occurs because Silver is less reactive than Copper.

QUESTION: Write the balanced chemical equation for the reaction between Magnesium metal and Iron(II) Sulfate solution. | ANSWER: Mg(s) + FeSO4(aq) --> MgSO4(aq) + Fe(s)

QUESTION: You have three metals: X, Y, and Z. Metal X displaces Y from its salt solution, but Y cannot displace Z from its salt solution. Arrange them in decreasing order of reactivity. | ANSWER: X > Y > Z

MCQ

Quick Quiz

Which of the following reactions will occur?

Copper + Zinc Sulfate

Iron + Aluminium Sulfate

Zinc + Silver Nitrate

Silver + Copper Nitrate

The Correct Answer Is:

Zinc is more reactive than Silver, so it will displace Silver from Silver Nitrate. In options A, B, and D, the metal added is less reactive than the metal in the salt solution, so no reaction occurs.

Real World Connection

In the Real World

This concept is vital in electroplating, like when we get silver-plated cutlery or gold-plated jewelry. In industries, this principle helps extract pure metals from their compounds. For example, in India, zinc is often used to recover silver from lead-zinc ores, a process crucial in mining and metallurgy.

Key Vocabulary

Key Terms

REACTIVITY SERIES: A list of metals arranged in decreasing order of their reactivity | DISPLACEMENT REACTION: A reaction where a more reactive element takes the place of a less reactive element in a compound | SALT SOLUTION: A solution formed when a salt (ionic compound) dissolves in water | CORROSION: The gradual destruction of materials (usually metals) by chemical reaction with their environment

What's Next

What to Learn Next

Great job understanding metal displacement! Next, you should explore the 'Reactivity Series of Metals' in more detail. Knowing this series thoroughly is like having a superpower to predict almost all metal displacement reactions, which is super useful for your upcoming chemistry topics!