1.4 a pH Flashcards
What is the pH scale?
What is the equation for the dissociation of water?
A reversible reaction
What is the alkali ion?
The OH- (aq) ion
What is the acidic ion?
The H+ (aq) ion
What makes solutions acidic?
Having a higher concentration of hydrogen (H+) ions than hydroxide (OH-) ions
What makes solutions alkaline?
Having a higher numbers of hydroxide ions that hydrogen ions
What is a neutral aqueous solution?
A solution containing equal concentrations of H+(aq) and OH- (aq) ions
What happens to the pH of acidic and alkaline solutions as they are diluted with water?
The pH moves towards 7
What happens to the relative concentration of H+ ions as acidic solutions are diluted with water?
Decreases
What is an acidic oxide?
A soluble non-metal oxide that lowers the pH of water when added.
What is a basic oxide?
A soluble metal oxide that increases the pH of water when added.
What is meant by a “base”?
A substance that neutralises an acid when added to it
What are the 3 categories of bases?
Metal oxides
Metal carbonates
Metal hydroxides
