Temp (C) 25 35 40 s0 1.14 × 10-15 1.00 × 10-14 2.09 × 10-14 2.92 x 10- 5.47× 10-

Question

Temp (C) 25 35 40 s0 1.14 × 10-15 1.00 × 10-14 2.09 × 10-14 2.92 x 10- 5.47× 10-14 ls the autoionization of water esothermic or endothiemic? Chosse the right variant ndothermic t depends on temperature it depcrds on pressure Because the value of the equilibeium constant increases as the temerature increases, the reaction is endothermnc In endethernic reactions, beat is a eactant, so as cerhane(heal) shilts he reaction so produce more peoducts and incoeases K in the procs Whot is the pit of pure waer 5o

Explanation / Answer

at 50 oC

Kw = [H+][OH-]

5.47 x 10^-14 = [H+]^2

[H+] = 2.34 x 10^-7 M

pH = -log [H+]

pH = - log (2.34 x 10^-7)

pH = 6.63

by drawing plot : at 37 oC

Kw = 2.42 x 10^-14

pH at this temperature :

pH = 6.81

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