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- A reaction occurs between I-(aq) and H2O2(aq) in the presence of H3O+, forming I2(aq) and H2O(l). (1). Write a balanced equation for the reaction.Write the expression Kc for the following reactions. (a) Fe2+(aq) + Ce4+(aq) ⇋ Fe3+(aq) + Ce3+(aq) (b) CaCO3(s) ⇋ CaO(s) + CO3(g)(Q82) What is the oxidation number for phosphorus in each of the following? Please include the positive and negative signs as appropriate. (a) H3PO4 (b) P4 (this reflects the elemental state of phosphorus) (c) PH3 (d) PO43- (e) p3-
- 7.6 In aqueous solution, boric acid behaves as a weak acid (pK, = 9.1) and the following equilibrium is established: B(OH)3(aq) + 2H,O(1) = [B(OH),]¯(aq) + [H,O]*(aq) (a) Draw the structures of B(OH); and [B(OH)4]¯. (b) How would you classify the acidic behaviour of B(OH);? (c) The formula of boric acid may also be written as H;BO;; compare the acidic behaviour of this acid with that of H;PO3.2.4 8 (a) Define in words the following: (1) Ka (ii) p.Ka I (b) Calculate the pH of 0.0005 mol dm³ ethanoic acid when its RK₂=4.75 → CH3COOH(aq) +___ H¹ (39) CH3COO (10) K₂ = pH =How do you take the electronic configuration of these compounds and their oxidation state? I don't know if I misunderstood the question but I thought you could only take the electronic configuration of individual atoms
- Which of the following reactions is/are incorrect? (a) (b) „N2* Br Но H3O* Br2 (c) CUCN CN a & bIn Cannizzaro's reaction, the intermediate that will be the best hydride donor is (A) (C) (B) H OH H (D) O₂N СОН H9-16. The active ingredient in Antabuse, a drug used for the treatment of chronic alcoholism, is tetraethylthiuram disulfide, S (C,H3),NCSSCN(C,H3), (296.54 g/mol). The sulfur in a 0.4329-g sample of an Antabuse preparation was oxidized to SO,, which was absorbed in H,O, to give H,SO4. The acid was titrated with 22.13 mL of 0.03736 M base. Calculate the percentage of ac- tive ingredient in the preparation.
- 2.4 8 (a) Define in words the following: (i) Ka (ii) pka (b) Calculate the pH of 0.0005 mol dm³ ethanoic acid when its pKa=4.75 CH3COOH(aq) CH3COO (aq) + H+ (aq) Ka= pH =An industrial chemist treats solid NaCl with concentrated H₂SO₄ and obtains gaseous HCl and NaHSO₄. When she substi-tutes solid NaI for NaCl, gaseous H₂S, solid I₂, and S₈ are ob-tained but no HI. (a) What type of reaction did the H₂SO₄ undergo with NaI? (b) Why does NaI, but not NaCl, cause thistype of reaction? (c) To produce HI(g) by the reaction of NaI with an acid, how does the acid have to differ from sulfuric acid?Provide the correct IUPAC name for HBrO₂(aq). (I) (II) (III) (IV) tri- hepta- penta- mono- octa- di- hexa- tetra- hypobromic hypobromous hydrobromic bromic hydrobromous perbromic perbromous bromous hydrate acid Delete
