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- Describe the conditions to be maintained during the titration of a permanganate solution with oxalate. Detail the chemical principles involved.Write the equation for the reaction of aqueous sodium p-toluate with aqueous HCI. Predict the products, and include phase labels for the expected phase of the products (are they solid or aqueous?). Indicate whether reactants or products are favored for this reaction.The pKa of barbital is 7.4. Which is the most acidic hydrogen in this molecule? How do you account for its acidity?
- a) Compare between equivalence point and endpoint. Distinguish which point comes first. b) Sulfanilamide, C6H4N2O2S is a sulfonamide antibacterial drug. The purity of sulfanilamide (168.18 g/mol) can be determined by the following steps. First, oxidize sulfur to SO₂ gas. Next, allow SO₂ gas generated to pass through H₂O₂ to produce H₂SO4. The acid is then titrated with NaOH standard solution. Given a 0.5136 g of sulfanilamide sample required an average titre volume of 48.13 mL 0.1251 M NaOH. Suggest a suitable indicator to be used in this titration and predict the purity of sulfanilamide being analysed. (Note: 1 mol sulfanilamide = 1 mol H₂SO4)What can you conclude regarding the difference in degree of acidity and alkalinity between organic and inorganic compounds? ( sample substances are dilute hcl, dilute acetic acid, dilute nh4oh and aniline).What method is used to precipitate arsenic (III) ions? Treatment with thioacetamide, acetic acid followed by hydrogen peroxide, magnesium nitrate and silver nitrate with acetic acid. Treatment with thioacetamide, acetic acid, hydrochloric acid followed by magnesium nitrate and silver nitrate with acetic acid. Treatment with thioacetamide followed by hydrogen peroxide, magnesium nitrate and silver nitrate with acetic acid. Treatment with thioacetamide, acetic acid, hydrochloric acid followed by hydrogen peroxide, magnesium nitrate and silver nitrate with acetic acid. C Treatment with acetic acid, hydrochloric acid and hydrogen peroxide.
- The structures of the pyridinium ion (16), pyridine N-oxide (17) and 1,4- dihydropyridine (18) are shown below. Explain which of these structures display aromaticity. You should provide descriptions of the bonding for each structure in your answer. (c) H. H H (16) (17) (18)Regarding the stability of the permanganate solution: describe the reactions that occur when it decomposes. Indicate which factors catalyze its decomposition and indicate how they can be controlled.(ii) Explain why, in the synthesis of nitric acid, the reaction of nitrogen monoxide with dioxygen is performed at high pressure and with cooling.