Less twitch and more revision could have fixed that
Firstly equilibrium not equation (I'm just being picky as an examiner would - it's nice to get in a good habit). The Mg2+ would react with the acid, so position of Eqbm would shift to the right to restore lost H+ ions. Remember, Mg2+ is a base!
Oh so that is one of those insoluble bases, is any Metal ion a base?
Guys if you add Magnesium to a buffer solution, which way does the equation shift?
C2h5COOH = H+ + C2H5COO-
Then you add Mg2+
I'm guessing Mg2+ reduces the amount of salt and makes more acid?
Wait no, Mg2+ makes acid dissaciate so makes more salt?
Basically, the Mg (and any strong alkali) reacts with the HA to produce the salt. This means that you're effectively taking away the mol of Mg from the mol of HA and adding it to the mol of A-. The position of the equilibrium shifts to counter the deficit in HA, therefore, reducing the change in pH.
Could someone quickly explain how ionic size and charge effects lattice enthalpy?
Erm strong charge means more attractive force, means stronger ionic bond means more exothermic. If two ions have the same charge then latice enthalpy is more exothermic as radius decreases because it means charge density is higher, as the forces of attraction has to travel less far so it is stronger.
I was making the (crude) assumption that he's talking about reacting Mg(OH)2 with an acid. As during buffer/neutralisation questions they'd state to add Mg(OH)2, not just leave it as "Mg2+".
Can anyone give a rough overview about what happens at each electrode in a fuel cell? Pleasee
You have both alkali and acidic half equations (I'm fairly sure you need to memorise both, it can be derived but takes time). I posted them a few pages ago.
I was making the (crude) assumption that he's talking about reacting Mg(OH)2 with an acid. As during buffer/neutralisation questions they'd state to add Mg(OH)2, not just leave it as "Mg2+".
Please never call a metal ion a base. That is incorrect in every way.
Please never call a metal ion a base. That is incorrect in every way.
So in answer to his question, adding "Mg2+ (whatever that means)" will shift the position of eqbm in which direction? Or is that not even a thing? I think he meant Mg(OH)2?
So in answer to his question, adding "Mg2+ (whatever that means)" will shift the position of eqbm in which direction? Or is that not even a thing? I think he meant Mg(OH)2?
Shift to the left, there's less [HA] and more [A-]