Chapter 17: The pH scale Flashcards
What is an acid?
A chemical compound which donates an hydrogen ion
What is a base?
A chemical compound which accepts a hydrogen ion
What is an alkali?
A base which is soluble in water
What is Arrhenius model of acids and bases?
How acids and bases can be determined
According to the Arrhenius model, what do acids produce?
A high concentration of hydrogen ions in an aqueous solution
According to the Arrhenius model, what do bases produce?
It forms alkali, which results in a high concentration of hydroxide ions (OH)
How do you tell if an acid is strong or weak?
The extent the acid reacts with water to form hydronium ions
What is the limitations of the Arrhenius model?
Not all substances fit the model, some can act as a base when they are acids
What modifications were made to make the model more accurate?
Acids release (protons, hydrogen) and bases bond with hydrogen ions
What is the calculation to figure out pH?
pH=-log [H]
H is the concentration of hydrogen
What is an indicator?
A substance which changes colour depending on the hydrogen ion concentration
