Which of the following substances is never a Bronsted-Lowry base in an aqueous s

Question

Which of the following substances is never a Bronsted-Lowry base in an aqueous solution? potassium hydroxide, NaOH_(g) sodium hydrogen phosphate, Na_2HPO_4(s) sodium phosphate, Na_3PO_4(s) ammonium chloride, NH_4C_(g) sodium bicarbonate, NaHCO_3(s) In the following reaction, HCO_3^- (aq) + H_2O_(s) CO_3^2- (aq) + H_3O^+ (aq) H_3O^+ is an acid and HCO_3^- is its conjugate base. HCO_3^- is an acid and CO_3^2- is its conjugate base. HCO_3^- is an acid and H_2O is its conjugate base. H_2O is an acid and CO_3^2- is its conjugate base. H_3O^+ is an acid and CO_3^2- is its conjugate base. Which of the following pairs of species is not a conjugate acid-base pair? HOCl, OCl^- HNO_2, NO_2^+ O^2-, OH^- HSO_4^-, SO_4^2- H_2CO_3, HCO_3^- What is the H_3O^+ concentration in 0.0013 M LiOH_(aq) at 25 degree C? 7.7 times 10^-12 M 1.3 times 10^-3 M 1.0 times 10^-14 M 1.0 times 10^-7 M 1.3 times 10^-17 M What is the pH of a 0.075 M HClO_4(aq) at 25 degree C? 15.12 2.59 12.88 1.12 11.41

Explanation / Answer

1. b

2. b.HCO3^- is acid and it's conjugate base CO3^2-

           HCO3^- and CO3^2- are conjugate acid and base

3. b. HNO2 and NO2^+

4. LiOH -----------------> Li^+ + OH^-

    0.0013M                           0.0013M

        [H+] = Kw/[H+]

                = 1*10^-14/0.0013

                = 7.7*10^-12 M

5. HClO4 ------------> H^+ + ClO4^-

    0.075M                0.075M

   [H+] = 0.075M

    PH    = -log[H+]

             = -log0.075 = 1.12 >>>>answer-d

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