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- 24. A solution of volume 0.500 L contains 1.68 g NH3 and 4.05 g (NH4)2SO4. (a) What is the pH of this solution? (b) If 0.88 g NaOH is added to the solution, what will be the pH? (c) How many milliliters of 12 M HCl must be added to 0.500 L of the original solution to change its pH to 9.00?Is H2Cr2O2 an acid, base, or neutral? please justify your answer with an equation showing its dissociation.What is the conjugate base of boric acid, B(OH)3? (A) OH– (B) B(OH)4– (C) B(O)(OH)22– (D) B(H2O)(OH)2+
- 1. Solid NH4NO3 dissolves in water and then reacts with KOH (aq). The container releases a smell as the reaction proceeds. (a) Write the acid-base reaction products for this reaction. (b) Write the decomposition reaction that happens immediately after the acid-base reaction that is responsible for the smell observed. 2. Write the complete and balanced Bronsted- Lowry acid-base reaction for the following. Choose the correct arrows to indicate if the reaction goes 100% to completion or is a reversible reaction using equilibrium arrows. (a) H₂S(aq) + NH4OH(aq) (b) HC₂H3O2(aq) + Ca(OH)2 (aq) 3. Use dimensional analysis, proper significant figures & show units. A nicotine-like compound found in tobacco has an empirical formula of C5H7O1 and a molar mass of 160 g/mol. What is the molecular formula of this compound?Calculate the pH of 0.83 mol/L solution of benzoic acid (C6H5COOH(aq))You found a bottle of aqueous solution in the laboratory cabinet. Unfortunately, the label has been eroded and you could not recognize it. To the best of your recollection, it may be one of the following solutions: HCl CH3COOH CH3CH2COOH A mixture of HF and NaF (both of substantial amount) A mixture of H3PO4 and NaH2PO4 (both of substantial amount) NH4Cl NaHCO3 In order to identify the solution, you conduct the following experiments: Using a pH meter, you determine the pH of the solution to be 3.00. You dilute 20 mL of the solution with water to a total volume of 200 mL and measure the pH again, this time it reads 3.50. You take some volume of the solution, add phenolphthalein, and titrate it with NaOH solution until the mixture turns pink. You record the volume of the required titrant as Vt and the pH meter reads 9.05. In a separate flask, you take the same volume of the unknown solution as in step iii and titrate it with the same NaOH…
