Chapter 5.4 Salts from metals Flashcards
What is the definition of a salt?
A salt is a compound formed when the hydrogen in an acid is partially replaced by metal or ammonium ions.
How can salts be made?
Salts can be made by reacting a suitable metal with an acid. The metal must be above hydrogen in the reactivity series, but not dangerously reactive.
What does a reaction between a metal and an acid produce?
The reaction between a metal and an acid produces hydrogen gas as well as a salt. A sample of the salt made can then be crystallised out of solution by evaporating off the water.
What is the reaction between a metal and an acid an example of?
The reaction between a metal and an acid is an example of a redox reaction. The metal atoms lose electrons and are oxidised, and hydrogen ions from the acid gain electrons and are reduced.
What is the general equation for the reaction ‘acid + metal’?
Metal + Acid ===> A salt + Hydrogen
