Question

what is the ph of 1M Nacl at 298 K?

Answer 1

+7 is the answer for this question

Answer 2

thus.,answer is ph value is 7
because 298k= 24.85°c=approx 25°c

The time when we add NaCl into water, it will completely dissociate into Na+ and Cl- ions ( salt hydrolysis ).

Parallelly water will build up it's own equilibrium

H2O → OH- + H+ K = 10^(-14 ) at 25℃

Na+ will combine with OH- whereas Cl- will combine with H+ , but as NaOH and HCl are strong base and acid simultaneously ,they will immediately dissociates into its ionic form completely

So in medium, we will have equal concentration of H+ = OH-

As per experimental data

Dissociation constant of water at 25 ℃ is

10^ (-14)= [H+] [OH-]

So at 25℃ [ H+]= [OH-] =10^(-7 )

Thus PH comes 7 at 25℃