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- 3. Why does adding a salt solution cause soap to precipitate?ZAVE O ll ZAIN IQ ..ester Exam → الوقت المتبقى 19. . . What is the molarity of a solution containing 72.06 grams of BaCl2 in enough water to make 800 mL of ?solution .a МО.433 .b М0.871 .C М0.243 IIQ2: Fill the blanks with suitable answers 1: The . is the thing being dissolved. 2: The branches of quantitative analysis are and 3. The filterability of the precipitate depend on the ... of practices.
- 1. What is the weight of the sample in trial 1? 2. What is the average weight of the precipitate in trial 1? 3. From the computed weight of the sample in trial 1, what is the theoretical amount of silver nitrate solution required to precipitate all of the chloride ions as silver chloride? 4. What is the molecular weight of the precipitate?Answer in not more than 5 sentences per question 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced? Give 2 examples of substances used as desiccants.Calculate the maximum mass (in g) of AgCl lost in a chloride analysis as a result of washing the of silver chloride with 130 mL of water at room temperature. (Note: Ksp for silver chloride is 0.000000000160. Pay attention to the sig.fig. in your calculation. Keep three sig.figs. in the answer.)
- Which of the following is a good description of a standard solution as a titrant? Section а. Unreactive with the analyte. b. Oxidizes when exposed to air. c. Non-volatile. d. Has slow reaction rate with the analyte.7. Find ppm of AgNO3 solution...Why must the following analysis be conducted in bodies of water? c. Total hardness
- In non-aqueous volumetric methods:I. Carbon dioxide and water is excluded to prevent these from reacting with the sample.II. The temperature is controlled to prevent loss of solvent.III. Samples are usually organic acids and organic bases which are weak electrolytes. a. I & III b. II only c. II & III d. I only e. I, II & III1. You are given a substance that is equally soluble in water and hexane (two immiscible solvents). a) What is K,? b) If you start with 10 g of the substance dissolved in 100 ml of water and are given 100 ml of hexane to extract with, algebraically show that it is better to do two smaller extractions using 50 ml of hexane for each extraction than it is to do one extraction using 100 ml of hexane.A 0.4482 g sample of impure NaCN is titrated with 0.1018 M AgNO3 requiring 39.68 mL to reach the end point. Report the purity of the sample as %w/w NaCN. a. 61.13% b. 63.13% c. 62.31% d. 66.25%