04/29/2024 Flashcards
If we dissolve a solid in an inert salt, and find that the ksp (involving the activities) is higher than the original ksp (ignoring the activities) what does it mean?
if our ksp is larger in a salty solution, it means that the inert salt pushed more of our ion to dissolve which gave a greater concentration than if we didn’t have anything in the the solution
when do we care about the activity coefficient and ionic strength
when the ionic strength is high, the solution is more salty and less ideal so we need to consider the activity coefficients
when the ionic strength is low, the solution is less salty and closer to an ideal solution, if the activity coefficient is close enough to 1 we can generally ignore it
what does adding an inert salt do to the equilibrium?
When we add an inert salt, it changes the position of equilibrium and it shifts towards the products to dissolve more
what does it mean to have a saturated solution
we have reached the max amount of something that we can dissolve in a solution, the rest will form precipitate
when dissolving MgCO3 in h20, what happens to the CO3
the carbonate will react with water (conjugate base to weak acid), this will lessen the concentration of Co3 in the solution which will cause more MgCO3 to dissolve
The CO3 will form HCO3 which is another conjugate base to a weak acid, this will cause the formation of H2CO3
3 reactions in total
what is the assumption with the charge balance equation?
we assume that the charges are balanced, otherwise the surface would be charged
when is it definitely relevant to include OH or H+ in the charge balance equation
when we have a subsequent reaction that is taking some of the concentration of the OH or the H
