19) The equilibriu ne pression for the hydrolysis of a weak base. A.in water is:

Question

19) The equilibriu ne pression for the hydrolysis of a weak base. A.in water is: Answer: 20) In the reaction HSO·Taq) + OH-(aq)-SO42-(aq) + HOOD, the conjugate acid-base pairs are pair 1 Hsor and so?-, pair 2 A. H20 and OH- B. HSO4 and Hyo* so2-and OH- C. HSO4 and OH So- and H:O D. HSO4 and HO; OH- and sO E. HSO4 and OH: so2- and H:0+. A) A Answer: B)BCCD)D E) E 1) If the ionization constant of water, Kw, at 40°C is 2.92 x 10-14, then what is the hydronium ion concentration and pH for an acidic solution? A) [H30+1> 1.71 x 10-7 M and pH> 6.77 C) [H3o+1 1.71 x 10-7 M and pH

Explanation / Answer

19)

A- is base

So, it will react with water to give OH-

The reaction is:

A-(aq) + H2O (l) <—> HA (aq) + OH- (aq)

Kb = [HA][OH-]/[A-]

Answer: C

20)

HSO4- is donating H+. So, it is acid

SO42- is formed from HSO4-. So, it is conjugate base

OH- is accepting H+. So, it is base

H2O is formed from H+. So, it is conjugate acid

Answer: A

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