When you are given multiple Ka or Kb values (like Ka step one , Ka dos , Ka step 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?
If 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 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 you to Ka and Kb was regarding you to some other in the an algorithm. So it algorithm allows you to move regarding Ka so you can Kb and you will vise versa. The brand new algorithm try revealed less than .
The wonderful thing about which algorithm could it be and additionally allows you in order to predict if something is an acidic otherwise a bottom . How you can shape whether or not something are an acid otherwise legs just by the Ka otherwise Kb value is to try to contrast it https://www.datingranking.net/cs/swingstown-recenze towards the equilibrium constant to have drinking water as in the fresh picture less than.
In the event your Ka converts about to become a much bigger number than just the Kb then agents is an acidic.
If for example the Kb turns planning to feel a much bigger count than the newest Ka then toxins was a bottom.
Provide the Kb and tell whether the chemical is an acid or base in the event it enjoys a beneficial Ka away from dos.cuatro * ten -six .
Answer: Acid (Ka is actually larger than Kb), Kb = ten -14 / dos.cuatro * ten -6 = 4.17 * 10 -9
Provide the Ka and you may give if the chemical substances is an acid otherwise feet in the event it keeps an effective Kb from 3.5 * ten -4 .
Answer: Legs (Kb are larger than Ka), Ka = 10 -fourteen / step three.5 * ten -cuatro = dos.86 * ten -eleven
Supply the Kb and you will give whether or not the chemical compounds was an acid or ft if this enjoys a good Ka away from cuatro.step three * 10 -nine .
Answer: Base (Kb is actually bigger than Ka), Kb = ten -14 / cuatro.step three * 10 -9 = dos.thirty-two * ten -six
Supply the Ka and you can share with whether or not the chemicals try an acidic or base in the event it have an effective Kb regarding 8.9 * ten -eleven .
Answer: Acidic (Ka are larger than Kb), Ka = 10 -14 / 8.nine * 10 -eleven = step 1.twelve * 10 -4
Allow the Kb and you can give whether the chemical are an acid or feet if this provides an effective Ka off 7.dos * ten -9 .
Answer: Base (Kb is actually larger than Ka), Kb = ten -14 / seven.dos * ten -9 = step 1.38 * 10 -6
Allow the Ka and you may tell whether or not the agents is actually an acidic otherwise base in the event it has a great Kb out-of cuatro.dos * 10 -twelve .
Answer: Acid (Ka was bigger than Kb), Ka = 10 -fourteen / 4.dos * 10 -eleven = 2.38 * 10 -4
Supply the Kb and you will tell whether the chemical substances is an acidic otherwise ft in the event it has good Ka of 3.4 * ten -3 .
Next what might become Ka
Answer: Acid (Ka was larger than Kb), Kb = ten -14 / step three.cuatro * 10 -3 = 2.94 * ten -twelve
Supply the Ka and you will give if the chemical compounds is an acid or ft whether or not it provides a good Kb of 5.6 * ten -eight .
Answer: Feet (Kb is actually bigger than Ka), Ka = ten -14 / 5.six * 10 -eight = 1.78 * ten -8
