Acids and alkalis Flashcards
What is a neutralisation reaction?
It is a reaction where an acid reacts with a base to make the pH increase towards 7.
What effect do soluble metal oxides have on the pH of pure water?
pH would increase to become alkaline (more than 7).
What effect do soluble non-metal oxides have on the pH of water?
pH would decrease to become acid (less than 7).
What products are formed when an acid reacts with an alkali?
Salt and water
What products are formed when an acid reacts with a metal carbonate?
Salt, water and carbon dioxide.
What are the 3 bases?
Metal oxides
Metal hydroxides
Metal carbonates
What makes a solution acidic?
An acidic solution has a greater concentration of hydrogen ions than hydroxide ions
What makes a solution alkaline?
An alkaline solution has a greater concentration of hydroxide ions than hydrogen ions.
Why is pure water neutral (neither an acid or alkali)?
If it has equal concentrations of hydrogen ions and hydroxide ions.
Give the word equation for the neutralisation reaction between a metal hydroxide and an acid.
Metal hydroxide + Acid –> salt + water
What is a salt?
A salt is a substance in which the hydrogen ions have been replaced by a metal ion
Give the word equation for the neutralisation reaction between a metal oxide and an acid
Acid + Metal oxide –> salt + water
Give the word equation for the neutralisation reaction between a metal hydroxide and an acid.
Acid + metal carbonate –> salt + water + carbon dioxide
What happens when a non-metal oxide dissolves in water?
An acidic solution is formed (pH less than 7).
What happens when a soluble metal oxide dissolves in water?
An alkaline solution is formed (pH more than 7).
