C5.4 - Salts From Metals (Not Finished) Flashcards
When can reactions between metals and acids occur (reactivity series)?
When the metal is more reactive than hydrogen (in the acid)
What is a salt?
The general name for a compound formed when the hydrogen in an acid is partially or wholly replaced by metal ions
Why are alkali metals never added to acid?
If the metal is very reactive, the reaction with acid is too violent to be carrie out safely
What is the general formula for the reaction between a metal and acid?
Metal + acid -> salt + hydrogen
Create a balanced equation for iron reacting with hydrochloric acid. Fe + HCl
Fe(s) + 2HCl(aq) -> FeCl2(aq) + H2(g)
When reacting metals with hydrochloric acid/sulphuric acid/nitric acid are always ___ , containing ___ ions
Chlorides Cl-, sulphates SO4 2-, nitrates NO3 -
How can the size of crystals collected from a solution be increased?
Evaporating water more slowly
How can you extract the metal salt produced in a metal + acid reaction from its aqueous solution?
Evaporate some water off until the point of crystallisation is reached (crystals will start appearing on the edge of the salt solution) then leave at room temp allowing the remaining water to evaporate off slowly
The metal + acid reaction is what type of reaction? And why?
A redox reaction, metal atoms loose electrons and are oxidised, hydrogen ions gain them and are reduced
