Conversion from pKb to Kb and what the base constant says

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You already know that all compounds that can form hydroxide ions in aqueous solution are called bases. But now you should do the conversion from pKb to Kb. What kind of sizes are they, what do they have to do with the base and how do you calculate them?

1+1 - the pKb-Kb conversion is not much more difficult.
1+1 - the pKb-Kb conversion is not much more difficult. © Stefan_Bayer / Pixelio

The difference between pKb and Kb 

  • If you are not yet sure what pKb and Kb actually mean, this knowledge gap should be filled before you start the conversion. The target value Kb of your calculation designates the base constant, which gives you information about the extent to which a given base reacts alkaline.
  • Alkaline means a reaction in aqueous solution in which hydroxide ions are more concentrated than protons. A base that reacts alkaline suggests a pH higher than 7. The opposite of an alkaline reacting base is an acidic base, where the base constant Kb can ultimately be calculated from the acid constant Ks.
  • Finally, you should know that Kb can further be interpreted as the strength of a base. The base constant indicates the completeness with which protons are transferred to the water.
  • This is where the pKb value comes into play, because its level provides information about the extent to which a base is trying to accept protons. The smaller the pKb, the higher that effort. pKb can be called the base exponent, which is a negative logarithm of the base constant.

This is how the conversion works

  • With the basic knowledge described above, you can now convert pKb to Kb. As the equilibrium exponent, the pK value is, as already mentioned above, the negative logarithm of the decade to the equilibrium constant Kb of a chemical reaction.
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  • So the formula that can help you convert or rather calculate Kb from pKb is pKb = -lg Kb. Simply solve this formula for Kb and you get Kb=pKb/-log.
  • Finally, you can use the calculated value to make statements about the strength of the base and should probably do so for the given task.

Basically, by the way, this calculation cannot necessarily be done like a conversion from millimeters to meters or minutes to denote hours, but you calculate a required one from the given variables based on the relations existing between them Value.

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