Chem – College: Relationships Between Acid and you may Legs Equilirium Constants (Ka and you may Kb)

Chem – College: Relationships Between Acid and you may Legs Equilirium Constants (Ka and you may Kb)

When you are given multiple Ka or Kb values (like Ka 1 , Ka dos , Ka 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?

In the event that End up being(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 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

It turns out that Ka and you will Kb are regarding you to definitely some other in the an algorithm. So it algorithm makes you transfer out-of Ka so you’re able to Kb and you can vise versa. The brand new formula is revealed lower than .

The fantastic thing about that it algorithm would it be in addition to allows you so you can expect whether or not anything try an acidic or a bottom . The best way to figure if something is actually an acidic or legs by just their Ka or Kb value is to try to contrast they towards the equilibrium constant to possess h2o like in new equation lower than.

Whether your Ka turns about to getting a bigger amount than simply the Kb then the agents would-be an acidic.

In the event the Kb transforms planning to become a much bigger number than just the Ka then the chemicals will be a bottom.

Allow the Kb and you can share with whether or not the chemicals is an acidic or base when it provides a good Ka out-of 2.4 * ten -six .

Answer: Acid (Ka is actually larger than Kb), Kb = 10 -14 / dos.cuatro * 10 -six = cuatro.17 * ten -nine

Give the Ka and give whether the agents was an acid otherwise feet in the event it has actually an excellent Kb regarding 3.5 * ten -cuatro .

Answer: Legs (Kb try larger than Ka), Ka = 10 -fourteen / step 3.5 * 10 -4 = 2.86 * 10 -11

Allow the Kb and you can tell whether the toxins was an acid or ft when it has actually a great Ka regarding cuatro.step 3 * 10 -nine .

Answer: Ft (Kb was bigger than Ka), Kb = ten -fourteen / 4.3 * ten -9 = 2.thirty-two * ten -6

Give the Ka and you can share with if the agents are an acid otherwise base if this provides good Kb out-of 8.nine * 10 -eleven .

Answer: Acidic (Ka try bigger than Kb), Ka = ten -fourteen / 8.nine * 10 -11 = step 1.several * ten -4

Supply the Kb and you can give perhaps the chemical substances is an acidic otherwise feet if this features a Ka out of eight.2 * ten -nine .

Answer: Foot (Kb is bigger than Ka), Kb = 10 -14 / seven.2 * 10 -nine = step one.38 * ten -6

Provide the Ka and you can give if the chemical is an acidic otherwise ft when it keeps good Kb out of cuatro.2 * ten -12 .

Answer: Acidic (Ka is bigger than Kb), Ka = 10 -fourteen / 4.2 * 10 http://www.datingranking.net/cs/pure-recenze -11 = dos.38 * ten -cuatro

Allow the Kb and you may tell perhaps the agents are an acid or legs whether it possess a Ka regarding step three.cuatro * ten -step 3 .

After that what would function as the Ka

Answer: Acidic (Ka try larger than Kb), Kb = ten -fourteen / step three.4 * ten -3 = 2.94 * ten -twelve

Provide the Ka and you will tell perhaps the chemical substances are an acidic or ft if this features a good Kb of five.6 * 10 -7 .

Answer: Ft (Kb try larger than Ka), Ka = 10 -14 / 5.six * 10 -7 = step 1.78 * ten -8

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