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- 51. The OH concentration of a solution is 4.3 × 10-¹0 M. What is the pH? A) -9.37 B) 9.37 C) -4.63 D) 4.63 E) 13.4 52. If the K₂ of an acid is 1.38 x 10-7, what is the pk₂? A) 6.86 B) 7.14 C) 8.68 D) 10.7 E) 1.38 53. The conjugate base of H₂PO4-¹ is: A) H₂PO4 B) HIPO C) HPO D) HPO. E) POA homogeneous mixture consists of 12% ethanol, 28% methanol and 60% water. Which of these is the solvent for the mixture? A) ethanol B) methanol C) water D) Ethanol and Methanolwhat is the pH of a 0.0250 M solution of calcium Hydroxide? A) 12.40 B) 1.60 C) 1.70 D) 12.30
- Consider a HCI solution with a pH of 4.70. a) Calculate the concentration of HCl. b) Identify the two underlying assumptions in part a). c) The original solution is diluted by 1,000 fold. Calculate the pH of the resulting solution. Make sure to indicate if the forementioned assumptions are still valid.For each of the following reactions, give a balanced net-ionic equation. Sulfate Ion a) MgSO4 + H2SO4 b) MgSO4 + BaCl2 Sulfite Ion a) Na2SO3 + H2SO4 b) Na2SO3 + BaCl2 c) BaSO3 + HNO3 Iodide Ion a) NaI + NaOCl b) NaI + AgNO3 c) AgI + NH3 d) NaI + H2SO4a) A bottle is labeled Demerol (meperidine) 50 mg/cc. How many cubic centimeters are needed to give a 125 mg dose? b) Promazine HCL comes as 500 mg/10 ml. How many milliliters are needed to give 150 mg dose? c) Hyaluronidase comes as 150 U/cc. How many cubic centimeters for a 30 U dose?
- 22) A mixture of NaCl and starch is placed in a dialyzing bag and immersed in distilled water. Which substance will be found outside the bag in the distilled water?A) NaCl B) Starch C) Both NaCl and Starch D) None of the AboveWhat volume of 0.10NH2 SO3 will be required to neutralize a solution containing 10.0grams of Ca(OH)2?a) 0.27Lb) 27Lc) 2.7Ld) 270L What volume of 1.5N NaOH is needed to react with 25ml 4.0N HCl?a) 66.67mlb) 6.67mlc) 50mld) 70mlYou have a 1000X stock solution of sodium chloride (NaCl). The concentration of NaCl in the stock solution is 5M. a)How would you make 300mL of a 1X solution? b)What is the concentration of NaCl in your 1X solution?
- the pH of a solution is decreased from 9 to 8, it means that the A) concentration of H+ has decreased to one-tenth (1/10) what it was at pH 9. B) concentration of H+ has increased 10-fold (10X) compared to what it was at C) concentration of OH- has increased 10-fold (10X) compared to what it was at D) concentration of OH- has decreased to one-tenth (1/10) what it was at pH 9. E) Both B and D are correct. p2. The attached figure is a titration curve for the amino acid glycine. At which pH is glycine expected to have its best buffering capacity? a) 2.1-3.1 b) 7.3-7.4 c) 6.8-7.4 d) 5.97 e) 12 Ans: a) 2.1 - 3.1What is the pH of a 0.1 M phosphate buffer (pKa = 6.86) that contains 10 times more of the conjugate acid form than the conjugate base form? a.) 5.86 b.) 16.86 c.) -3.14 d.) 6.86