SIR I POST U A QUESTION IN PREVIOUS DAYS;CALCULATE pH OF 1.0X10-8M SOLUTION OF HCL.PLEASE SIR READ CAREFULLY THAN GAVE ME ANS BECAUSE ANS. OF THIS QUESTION IS pH=6.98.

Asked by neetu athwal | 22nd Dec, 2013, 02:06: PM

Expert Answer:

HCl is a strong acid, it dissociates in aqueous solution. 

Since pH = -log [H+], you need to find the concentration of H+ ([H+]). 

Water dissociates as: H2O ? H+ + OH

The dissociation constant is Kw = 10-7 

So, 10-7 moles of H+ ions in pure water. By adding the 10-8 moles of HCl, the resulting concentration of H+ will be,

 [H+] = 1.1 x 10-7 

The negative log of 1.1 x 10-7 = 6.98, which is the pH value.

Answered by Hanisha Vyas | 22nd Dec, 2013, 03:49: PM

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