Question

chemist measures [H,O*] and TOH] in an aque- 11. A young ous solution at 25°C. He reports that [H2O*] = 1 x 108 and [OH] = 1x 108. His lab instructor tells him to go the lab and make the measurements again. Why? 12. What advantage does the pH scale offer that scientific no- tation does not? back to 13. All the following substances can undergo deprotonation re- actions. Write the equations for their dissociation constants. a. HCIO4 b. H2CO3 с. НВО,

Answer 1

- The ionization of water can be given as - 2H20 (1) - HBO (aq) + OH (ar) ionization constant of water can be given as - ki - [H30 * (ag] ] * [OH- (aq)] [H20 (1)]2 a kd X[H2O) = [H20*]*[ -] a Kw = [ltsot] [oto] Hene, Kw=ionie prooduct of water = [H3O+] [ot] Again, At 25°c temperature the ionic prooduct of water is Kw = 10-14 Thus from equation t we can give that -

[H3O+ [OH-] = 10-14 Now, here at 25°c the measured that, – chemist [H3O+] = 1 x 10-8 aw (04-) = 1 x 10-8 Thus, – [H3O+] [ ost -] = 10 x 10-8. = 10 16 (+ 10-14) & As, at 25°c, the prooduct of the [1430t] and [ost-] of any aqueo. us solution must be 10-14, so the a chemist have done something wrong in measuring the concentra- tion. Hence the lab instrouctor tells him to go back to the lab and make the measuroments again.
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