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- 4b please answer (predict the outcome and explain briefly(a) How does the metallic character of an element correlate with the acidity of its oxide? (b) What trends, if any, exist in ox-ide basicity across a period and down a group?Like any equilibrium constant, Kᵥᵥ changes with tempera-ture. (a) Given that autoionization is endothermic, how does Kᵥᵥ change with rising T? Explain with a reaction that includes heatas reactant or product. (b) In many medical applications, the value of Kᵥᵥ at 37°C (body temperature) may be more appropri-ate than the value at 25°C, 1.0X10⁻¹⁴. The pH of pure water at 37°C is 6.80. Calculate Kᵥᵥ, pOH, and [OH] at this temperature.
- (b) The K₂ of HClO₂ is 0.010. Determine the pH of a 0.1 M HClO₂ aqueous solution at equilibrium.Arrange the compounds in each series in order of increasing acid strength: (a) AsH3, HBr, KH, H2Se; (b) H2SO4, H2SeO3, H2SeO4.Please write a discussion on each of these (Electric conductivity , Acidity , PH value , Turbidity).
- (8) Answer each of the following questions: (a) Ka for HNO2 is 4.6 x 10-4. What is the Kb for its conjugate base ? (b) Calculate the pH of 0.1 M of HNO2 solution using the ka above.The following observations are made about a diprotic acidH2A: (i) A 0.10 M solution of H2A has pH = 3.30. (ii) A 0.10 Msolution of the salt NaHA is acidic. Which of the followingcould be the value of pKa2 for H2A: (i) 3.22, (ii) 5.30,(iii) 7.47, or (iv) 9.82?The average daily dose recommended by hematologists for drugs is no more than 200 mg in terms of elemental iron. What mass of а) FeSO4·7H2O b) FeCl2·4H2O should be taken to ensure the daily requirement for iron. Will pH of solutions of salts mentioned in a) and b) basic, acidic or neutral. Write equations of hydrolysis.
- Rank the following acids in order of increasing strength: (a) HClO4, H3PO4, H2SO4; (b) H3PO4, H3AsO4, H3SbO4; (c) HOF, HOCl, HOBr, HOI; (d) HOCl, HClO2, HClO3, HClO4; (e) CH3CO2H, CF3CO2H, CCl3CO4H;What is the basis for referring to the hydrogen ion as a proton? (a) The Arrhenius definition of an acid. (b) The Brønsted-Lowry definition of an acid x (c) The Lewis definition of an acid. (d) H* exists as a bare proton. (e) None of these.Calculate the pH of a dilute solution that contains a molar ratio of potassium acetate to acetic acid (pKa = 4.76) of (a) 2:1; (b) 1:3; (c) 5:1; (d) 1:1; (e) 1:10