unit 2 chemistry cover Flashcards
In water and aqueous solutions with a pH value of 7, what are the concentrations of H3O+ (aq) and OH− (aq)?
Both 10-7 mol l-1 at 25°C.
What do equimolar solutions of weak and strong acids (or bases) have?
Different pH values, conductivity, and reaction rates, but the stoichiometry of reactions are the same.
What happens in a basic buffer?
The weak base removes excess hydrogen ions, and the conjugate acid provided by the salt supplies hydrogen ions when these are removed.
What is the theoretical point at which colour change occurs?
When H3O+=KIn
What does the second law of thermodynamics state?
The total entropy of a reaction system and its surroundings always increases for a spontaneous process.
What does the third law of thermodynamics state?
The entropy of a perfect crystal at 0 K is zero.
What is a feasible reaction?
One that tends towards the products rather than the reactants.
