What is the difference between displacement and double displacement reactions
Write equations for these reactions.
In the refining of silver the recovery of silver from silver nitrate sol
Answers
Explanation:
When a more reactive element displaces a less reactive element from its salt solution, then it is called displacement reaction. While there is an exchange of ions between the reactants to produce new substances, it is called double displacement reaction.
In displacement reaction one displacement takes place. While in double displacement reaction two displacements takes place. Following are examples of displacement reaction and double displacement reaction.
Mg (s) + 2HCl (aq) ⇨ MgCl2 + H2 (g)
2KBr (aq) + BaCl2 ⇨ 2KCl (aq) + BaBr2 (s)
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
Answer: 2AgNO3 (aq) + Cu (s) ⇨ Cu(NO3 )2 (l) + 2Ag (s)
What do you mean by a precipitation reaction? Explain by giving examples.
Answer: Reactions in which precipitate is formed are called precipitation reactions. Generally in a precipitation reaction insoluble salts are settled down as precipitate.
Na2SO4 (aq) + BaCl2 (aq) ⇨ 2NaCl (aq) + BaSO4 (s)
In the above reaction, when sodium sulphate reacts with barium chloride, the white precipitate of barium sulphate is formed along with the sodium chloride.
Answer When copper is mixed in silver nitrate solution, it displaces the silver because copper is more reactive than silver.
2AgNO3 + Cu —> Cu(NO3)2 + 2Ag