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$\begingroup$ How to derive the following equation : $$\mathrm{pH_{init}}=7 + 0.5 ( \mathrm{p} K_\mathrm{a2} + \log{ [ \ce{Na2CO3} ]} )$$ $\endgroup$
– Adnan AL-Amleh
Commented Sep 19, 2019 at 3:50
1

$\begingroup$ @Adnan AL-Amleh From analogous equation pH=0.5(pKa - log c ) for solution of a weak acid, that is derived with a simplification from definition of an acid dissociation constant. All is the basic stuff from chemical textbooks. $\endgroup$
– Poutnik
Commented Sep 19, 2019 at 3:58
1

$\begingroup$ @Adnan AL-Amleh Perhaps you are looking for en.wikipedia.org/wiki/Henderson%E2%80%93Hasselbalch_equation ? $\endgroup$
– ManRow
Commented Sep 19, 2019 at 23:20

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