When you are given multiple Ka or Kb values (like Ka step one , Ka dos , Ka 3 ), 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?
In the event that Be(OH)
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 kupóny minder 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 . 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
As it happens you to definitely Ka and you will Kb is related to one several other for the a formula. Which formula makes you convert out of Ka to help you Kb and you may vise versa. Brand new algorithm are found lower than .
The fantastic thing about this formula can it be along with allows you so you’re able to expect if anything was an acid or a base . The way to profile whether or not some thing are an acid or feet by just the Ka otherwise Kb worth would be to examine they to your equilibrium constant to have liquids as with the fresh new formula below.
In case the Ka transforms about to be a larger count than the newest Kb then your chemicals was an acidic.
If for example the Kb converts about to be more substantial count than the brand new Ka then your chemical substances would-be a bottom.
Supply the Kb and you can share with if the agents is an acidic otherwise legs whether it possess a good Ka of dos.4 * ten -6 .
Answer: Acid (Ka try bigger than Kb), Kb = ten -fourteen / dos.4 * 10 -6 = 4.17 * ten -nine
Give the Ka and you will tell whether or not the chemicals try an acidic otherwise base if this enjoys good Kb off step three.5 * 10 -cuatro .
Answer: Legs (Kb try bigger than Ka), Ka = ten -fourteen / step 3.5 * 10 -4 = dos.86 * 10 -11
Allow the Kb and tell whether or not the chemical substances is actually an acidic otherwise foot if it have a Ka of 4.step three * 10 -9 .
Answer: Legs (Kb is actually bigger than Ka), Kb = ten -fourteen / cuatro.3 * 10 -nine = 2.thirty-two * ten -six
Supply the Ka and you may tell whether or not the chemical compounds was an acid otherwise ft when it have good Kb out-of 8.9 * ten -eleven .
Answer: Acidic (Ka was larger than Kb), Ka = 10 -fourteen / 8.nine * 10 -11 = 1.a dozen * 10 -4
Give the Kb and you will tell if the toxins is an acidic otherwise feet in the event it features an excellent Ka off seven.2 * 10 -9 .
Answer: Base (Kb are larger than Ka), Kb = ten -fourteen / 7.2 * ten -nine = 1.38 * 10 -six
Supply the Ka and share with if the chemicals was an acid otherwise feet if it keeps an effective Kb of cuatro.dos * 10 -a dozen .
Answer: Acid (Ka try larger than Kb), Ka = ten -14 / cuatro.dos * ten -eleven = dos.38 * 10 -4
Allow the Kb and share with whether or not the chemicals is actually an acidic otherwise legs when it provides good Ka regarding step 3.cuatro * 10 -step 3 .
Upcoming what can be the Ka
Answer: Acidic (Ka is actually bigger than Kb), Kb = ten -14 / 3.cuatro * 10 -step 3 = 2.94 * 10 -12
Give the Ka and you will share with whether the toxins is an acidic otherwise ft if this has an excellent Kb of five.six * ten -seven .
Answer: Foot (Kb is actually larger than Ka), Ka = 10 -fourteen / 5.six * ten -7 = step 1.78 * 10 -8
