pk questions

[Mjooo]

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HII

i would like to ask about 2 things

1- if we have 2 bases , one with pk=8 and another is pk=10 ,
what is the diffrent between the two? which one stronger ? which one have more proton?

2- if we have natural ph=7 , and we add one drop of NAOH ,
what will happen? what change will occure?

sorry for the language and sorry for any spelling mistake

wish to find answers from u

 

[gwjib04]

Hi Mjoo

1. You must specify if the "pk" value is pKa or pKb. These are the negative log of the acid or base dissociation constants. If these bases have a pKb of 8 or 10 then the base with pKb=8 is stronger. That is, it is found in protonated form more often.

2. If you have a neutral pH which is 7 and add NaOH, then the pH will increase because NaOH is a strong base. You are are simply adding OH- to the solution.

You must know the NaOH concentration and volume of the "drop" before you can know how much pH will change.