Chem – College: Dating Ranging from Acidic and you will Ft Equilirium Constants (Ka and you will Kb)

Chem – College: Dating Ranging from Acidic and you will Ft Equilirium Constants (Ka and you will Kb)

When you are given multiple Ka or Kb values (like Ka step step one , Ka dos , Ka step step three ), you can also combine them together into an overall Ka or Kb by multiplying them together. The equations below display what I mean.

If Mg(OH) 2 has a Kb 1 of 0.3 and a Kb 2 of cuatro.5 * 10 -3 what is the over all Kb value?

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If H 3 PO 4 has a Ka 1 of 2.8 * 10 -3 and a Ka 2 of 7.1 * 10 -6 . 3 if the overall Ka is 7.75 * 10 -17 ?

Answer: ( 2.8 * 10 -3 ) * ( 7.1 * 10 -6 ) * Ka 3 = 7.75 * 10 -17

If Al(OH) 3 has a Kb 1 of 0.04 and a Kb 2 of 5.1 * 10 -4 what is the over all Kb value?

If H 2 SO 4 has a Ka 1 of 15 and a Ka 2 of 2.0 * 10 -2 . Then what is the over all Ka value?

If H 3 PO 3 has Ka 2 of 4.7 * 10 -5 and a Ka 3 of 2.3 * 10 -8 . established men 1 if the overall Ka is 5.5 * 10 -16 ?

Answer: Ka1 * (4.7 * 10 -5 ) * (2.3 * 10 -8 ) = 5.5 * 10 -16 — Ka1 = 5.09 * 10 -4

2 has a Kb 1 of 3.6 * 10 -4 and an overall Kb of 8.2 * 10 -12 what would be the Kb 2 ?

Answer: (3.6 * 10 -4 ) * Kb 2 = 8.2 * 10 -12 — Kb 2 = 2.24 * 10 -8

It turns out you to Ka and Kb was connected with that several other in a formula. So it formula makes you convert regarding Ka so you can Kb and you may vise versa. The formula try shown below .

The wonderful thing about this formula could it possibly be including allows you so you’re able to anticipate whether something try an acidic otherwise a base . The best way to profile whether anything try an acid otherwise feet just by its Ka or Kb really worth should be to compare it towards the balance ongoing to own liquid as with the newest equation lower than.

Whether your Ka converts planning to become a more impressive number than just brand new Kb then chemical might possibly be an acidic. Continua a leggere