A solution of calcium hypochlorite, a common additive to swimming-pool water, is

Question

A solution of calcium hypochlorite, a common additive to swimming-pool water, is A) basic because of the hydrolysis of the OCI^- ion B) basic because Ca(OH)_2 is a weak and insoluble base C) neutral if the concentration is kept below 0.1 molar D) acidic because of the hydrolysis of the Ca^2+ ions E) acidic because the acid HOCI is formed What is the pH of a 1.0 times 10^-2 molar solution of HGN? (For HCN, K_a = 4.0 times 10^-10.) A) 10 B) between 7 and 10 C) 7 D) between 4 and 7 E) 4 A 1-molar solution of which of the following salts has the highest pH? A) NaNO_3 B) Na_2CO_3 C) NH_4CI D) NaHSO_4 E) Na_2SO_4 Which of the folio wing acids can be oxidized to form a stronger acid? A) H_3PO_4 B) HNO_3 C) H_2CO_3 D) H_3BO_3 E) H_2SO_3 H_2C_2O_4 + 2 H_2O 2 H_2O^+ + C_2O_4^2- Oxalic acid, H_2C_2O_4, is a diprotic acid with K_1 = 5.0 times 10^-2 and K_2 = 5.0 times 10^-5. For the reaction above, what is the equilibrium constant? A) 5. times 10^-2 B) 5.0 times 10^-5 C) 2.5 times 10^-7 D) 5.0 times 10^-7 E) 2.5 times 10^-8 HSO_4^- + H_2O H_3O^+ + SO_4^-2 In the equilibrium represented above, the species that act as bases include which of the following? I. HSO_4^- II. H_2O III. SO_4^2- A) II only B) III only C) I and II D) I and III E) II and III Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC_2H_3O_2. For 20.0 mL of the vinegar, 32.0 mL of 0.500-molar NaOH solution was required. What was the concentration of acetic acid in the vinegar if no other acid was present? A) 1.60 M B) 0.800 M C) 0.640 M D) 0.600 M E) 0.400 M Equal volumes of 0.10-molar H_3PO_4 and 0.20-molar KOH are mixed. After equilibrium is established, the type of ion with the largest concentration, other than the K^+ ion, is: A) H_2PO_4^- B) HPO_4^2- C) PO_4^3- D) OH^- E) H_3O^+ A small quantity of each of the following is added to separate samples of an aqueous solution of acetic acid. Which would leave the lowest concentration of acetate ions? A) bicarbonate solution B) hydrochloric acid C) magnesium D) ethanol E) sodium hydroxide solution Which of the following is the correct equilibrium expression for the hydrolysis of CO_ 3^2-? A) K = [HCO_3^-]/[CO_3^2-][H_3O^+] B) K = [HCO_3^-][OH^-]/[CO_3^2-] C) K = [CO_3^2-]/[CO_2][OH^-]^2 D) K = [CO_3^2-][OH^-]/[HCO_3] E) K = [CO_3^2-][H_3] Which, if any, of the following species is in the greatest concentration in a 0.100-molar solution of H_2SO_4 in water? A) H_2SO_4 molecules B) H_3O^+ ions C) HSO_4^- ions D) SO_4^2- ions E) All species are in equilibrium and therefore have the same concentrations.

Explanation / Answer

1) Option A basic due to hydrolysis of ClO-

2) pH = 1/2[pKa-logC] = 1/2[9.6 -log 10-2]

   = 11.6/2= 5.8

option D

3)option B sodium carbonate is salt of weak acid strong abse thus , basic.

4)option e

H2SO3 sulphurous acid can be oxidised to H2SO4

5) optionC

  K for the overall reaction = k1 xk2

   = 2.5x10-6

6) option D

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