15. Which is the equilibrium constant expression for the first step of the ioniz

Question

15. Which is the equilibrium constant expression for the first step of the ionization of H,BO, in water? 18. Which of the following is a K xprestion? hio that can be use d to write a 1) ?,??, 2) HBO, Cro, a)+HO 3) H,BO, 19. How much of 0 500 M NaOH is nceded to neutralize 100. ml of 1.00 MH,SO H,BO, 2) 100. mL 3) 200. mL 4) 400. ml 5) 50.0 ml. 5) K2 HBO, Which of the following is the weakest acid? 1) HCIO, 2) HCIO 3) HCIO, 4) HCI 5) HCIO Which of the following dissolves in water to produce a 16. 20. The phl of 0.15 MHC is ) 0.82 2) 0.71 3) 0.97 4) 0.15 5) 13.18 17. basic solution? (is a basic anhydride) 1) NO 2) CO2 3) SO, 4) K,O

Explanation / Answer

15.   H3BO3(aq) + H2O(l) ---------> H2BO3^- (aq) + H3O^+(aq)
      K   = [H2BO3^-][H3O^+]/[H3BO3]
4. K   = [H2BO3^-][H3O^+]/[H3BO3]
16. HClO4>HClO3>HClO2>HClO
HClO is weak acid
2. HClO
17. metalic oxides are basic in nature.
4. K2O
18. 1. CH3Nh2(aq) + H2O(l) --------> CH3NH3^+ (aq) + OH^- (aq)
19.   2NaOH(aq) + H2So4(aq) --------> Na2So4(aq) + 2H2O(l)
      2 moles     1 moles
NaOH                         H2SO4
M1 = 0.5M                   M2 = 1M
V1 = 100ml                 V2 =
n1 = 1 moles               n2 = 1moles
            M1V1/n1 =   M2V2/n2
                V2    = M1V1n2/n1M2
                      = 0.5*100*1/1*1   = 50ml
5. 50ml

20.   HCl(aq) ----------->H^+(aq) + Cl^-(aq)
        0.15M               0.15M
        [HCl] = [H^+]    = 0.15M
         PH = -log[H^+]
             = -log0.15
              = 0.82
1. 0.82

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