Acids, Bases And pH Flashcards
Brønsted-Lowry bases are….
Proton acceptors
A bronsted- Lowry acid is…
A proton donor, release hydrogen ions when mixed with water
Acid-base equilibria involves…
The transfer of protons
Info on strong acids and bases in water
Strong acids can almost completely dissociate in water (nearly all the Hydrogen ions are released) eg HCl. Eqm lies to right
Strong bases ionise almost completely in water. Eqm lies to right
Info on weak acids and bases in water
Weak acids dissociate only very slightly, only small number of H+ ions formed. Eqm set up which lies to the left
Weak bases only slightly dissociate in water, eqm to left
What are transferred when acids and bases react
Protons
What does water dissociate into
Hydroxonium ions and hydroxide ions
The pH scale is a measure of what
The hydrogen ion conc
By how much does water dissociate
Only very slightly
What does monoprotic mean, give 2 examples
Each molecule of an acid will release 1 proton when it dissociates
Eg HCl and HNO3
Example of a diprotic acid
Sulphuric acid
What happens to weak acids and bases in aqueous solutions
They dissociate only very slightly
What things can you do to make your titration results accurate
Measure neutralisation volume as precisely as possible (usually to nearest 0.05cm3)
Repeat at least 3 times, take mean average = reliable
Don’t use anomalous results
What do diprotic acids do
They release 2 protons when it dissociates
What is a buffer
A solution that resists changes in pH when small amounts of acid or alkali are added
