Dissolution and equilibrium Flashcards
What is an example of dynamic equilibrium in the lab?
Mg(OH)2
What is la chateliers principle?
When a system in equilibrium is subjected to an external constraint, the system responds in a way that tends to lessen the effect of that constraint
Are equilibrium reactions forwards or reverse?
can be both
What is an example of a molecule which can disrupt the equilibrium in an environment?
CaSO4
Where does magnesium sit on the ionic potentials plot?
it sits right on the line between soluble cations and insoluble oxides & hydroxides
What does magnesium being in that “grey” area between segments on the ionic potential plot mean?
unsure whether it will dissolve into solution or form an insoluble hydroxide
What is a lab experiment involving Magnesium to test dynamic equilibrium?
add radioactive magnesium
observe- radioactive Mg is in the solution
Mg concentration remains unchanged
What must be taking place for Mg concentration to remain the same after radioactive magnesium is added?
a secondary reaction
re-precipitation of magnesium hydroxide
What will an equilibrium equation look like?
A+B<—>C+D
What is the formula for dynamic equilibrium (K)?
products/reactants
([C]x[D])/([A]x[B]) []= activity in mol/L
Will it be a forward or a backwards reaction when k is greater than 1?
forward
