HClO is a weak acid (Ka 4 0 108) and so the salt NaClO actsas a wea...

Given Ka of HClO 40 E8 NaClO 0017 M We know NaClO ClO salt dissociates comp ....

HClO is a weak acid (Ka = 4.0 Ã— 10â€“8) and so the salt NaClO...

4.5 Ratings (995 Votes)

Given :

Ka of HClO = 4.0 E-8

[NaClO] = 0.017 M

We know

[NaClO]= [ClO-] â€¦.(salt dissociates completely)

Reaction of ClO- with water

Â Â Â Â Â Â Â Â Â Â Â ClO- (aq)Â Â + H2O (l)Â Â Â ---- > HClO (aq)Â Â Â + OH- (aq)

I Â Â Â Â Â Â Â Â Â 0.017 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 0

CÂ Â Â Â Â Â Â Â -xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â +x

EÂ Â Â Â Â (0.017-x) Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â xÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â x

kb = 1.0 E-14 / ka

= 1.0 E-14 / 4.0 E-8

= 2.5 E -7

Les find x

2.5 E-7 = x² / (0.017-x)

2.5 E-7 x 0.017 = x²Â Â Â Â Â Â Â Â (By using 5 % approximation)

x = 6.52 E-5

x = [OH-] = 6.52 E-5

pOH = - log ([OH-]) = -log ( 6.52 E-5)

= 4.19

pH = 14 â€“ pOH = 14- 4.19 = 9.81

pH = 9.81

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