Answer Posted / praveen kumar (ipca_ranu)

Pure water has a neutral pH=7. Because of this, the concentration of acid in solution = concentration of base in solution. Therefore, [H3O+]=[OH-]. We have to memorize that Kw=10^-14, but once we memorize this it becomes clear that for neutral water [H3O+]=[OH-]=10^-7 because the product of both equals Kw. Hope this helps!

Praveen kumar
IPCA
Sr. Excutive

As per ICH related substances stability trend limit from initial to shelf life

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