Question

help me out, please! answer all the multiple choice.  

(15) A phosphate buffer solution is prepared by mixing 100. mL. of 0.300 M KH PO, and 150.ml 0.500 M K HPO (a) Calculate the molar concentrations of H:PO, and that of HPO,2 in the buffer solution. (b) What is the pH of the buffer solution? (H,PO, has K,-6.2 x 10 (c) Write a net ionic equation for the bufering reaction against a strong acid, Hjo (d) Calculate the new concentration of H PO, and HPO,respectively, after 0.020 mole added to the buffer solution, and the new pH of the solution. (Assume that the overall volume the buffer solution remains the same.) AgCl) Ag(a) 12) Given that CT (aq);Kp 1.6x 10o te the expression for the equilibrium constant, K, for the following equilibrium and calculate its value using the above Ksp and K values. (b) Calculate the solubility in mol/L of AgCl in 3.0 MNH, solution. A phosphate buffer solution has pH-750, and one of the components is H:PC. (K.-6.3 x 10) 19. Which of the following would be the second component in the buffer? (A) HPO (B) PO. (C) H PO (D) Anyone of them Which of the following combinations will NOT form a buffer solution? 20. (A) 50.0 mL of 0.20 MCH,CO,Hag)+50.0 mL of 0.10 M NaCH CO,(a) (B) 50.0 mL of 0.10 MCH,CO Hag)+50.0 mL of 0.20 MNaCH,CO (a) (C) 50.0 mL of 0.10 MCHCO Ha)+50.0 mL of 0.20 M NaOH(ag) (D) 50.0 mL of 0.20 MCH,CO Ha)+50.0 mL of 0.10 M NaOH(ag) 21. Magnesium hydroxide has Kp 90x 10 1 at 25"C. What is the pH of saturated Mg(OH), solution? (A) 10.12 (B) 10.42 (C) 8.48 (D) 11.05 22. The solubility of lead(II) iodide, Pbl, 15x 10mol/L at 25°C. What is the Kp of Pbl,? (B) 5.6 x 10 (A) 2.3 x 10 (C) 1.4 x 10* (D) 8.4 x 10-0 23. If silver phosphate, Ag.PO, has Kp 1.8 x 10, what is the solubility (in mol/L) of Ag,PO,? (D) 1.2 x 10 (C) 3.7 x 10 (A) 7.7 x 107 (B) 1.6 x 10 24. For the following equilibrium: Mg(OH)) Mg(aq)2 OH (aq): Kip 9.0 x 10- If a saturated solution of Mg(OH): contains 0.020 M Mg, what is the pH of the solution? (C) pH 3.58 (D) pH 10.42 (B) pH = 4.67 (A) pH -9.33 25. The following compounds are only slightly soluble in water. Which of them is soluble in dilute nitric acid? (C) BasO, (D) CaCO, (A) AgCI (B) Pbl;

Answer 1

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