Acids And Redox 2.4 Flashcards
What is a weak acid?
Such as ethanoic acid only releases a small proportion of its hydrogen atoms into solution as H+ ions. A weak acid partially dissociates in aqueous solution.
What is a strong acid?
Such as HCl, releases all its hydrogen atoms into solution as H+ ions and completely dissociates in aqueous solution.
HCl (aq) -> H+ (aq) + Cl- (aq)
What does a base do?
A base neutralises an acid to form a salt.
What is an alkali?
An alkali is a base that dissolves in water releasing hydroxide ions (OH-) into the solution.
Neutralisation
When H+ ions react with a base to form a salt + water.
What happens to oxygen in peroxides?
Turns into -1 (e.g hydrogen peroxide h2o2)
What happens to oxygen when bonded to F?
Turns to +2
What happens to Hydrogen in metal hydrides?
Turns into -1 e.g NaH, CaH2
What is a disproportionation reaction?
It is a reaction where the same element is both oxidised and reduced simultaneously in the same reaction.
Metal and Acid
Metal + Acid —> Metal Salt + H2
Metal Oxide + Acid
Metal oxide + Acid —> Salt + H2O
Metal hydroxide + acid
Metal Hydroxide + Acid —> Salt + Water
Metal Carbonate + Acid
Salt + Water + Carbon Dioxide
Spectator ion
Ions that are present but take no part in a chemical reaction
Where should the water line be touching in a titration reaction?
The Bottom of meniscus must be touching the water line
