12. The aqucous solution of which salt will have the strongest cation-dipole int
ID: 694030 • Letter: 1
Question
12. The aqucous solution of which salt will have the strongest cation-dipole interaction? a. NaCl 13. Enough water is added to 11.5 g of ethanol to make 2.00 L of solution. What is the molarity of the ethanol? d. 5.75 M e. 0.333 M 0.125 M b. 0.250 M c. 0.500 M 14. Which pair of substances will dissolve in each other? L CHiQH II. Col III. CH,CH a. I and II b. yl and III c. 1 and III d. I and II, II and 11I 15. All the following will dissolve in water except: exane a ethanol Problem Solving I. Use concepts of chemical bonding and/or intermolecular forces to account for each of the b. aluminum chloride c. calcium nitrate following observations. List the type of intermolecular force for each substance. a. The boiling points of water, ammonia, and methane are 100, -33 C, and -134'C respectively b. At STP, chlorine is a gas, bromine is a liquid, and iodine is a solid. 2. Solid Ammonium chloride dissolves in water with a marked decrease in temperature. Calcium chloride dissolves in water with a marked increase in temperature. Little or no temperature change is observed when solid sodium chloride dissolves in water. a. Write an equation that describes the dissolving process of ammonium chloride. b. Is the dissolving of calcium chloride endothermic or exothermic? c. Describe the opposing forces of attraction that are at work in the dis chloride. Which are greater? Why? solution of calcium 3. Using some common laboratory equipment and materials, devise a plan to deduce the type o bonding in a sample of unknown solid. Specify the tests you would perform and discuss vw results mean. Iculate the molarity, molality, and mole fraction. Given the density of ethanol 0.79 g/mL and water is g/mLExplanation / Answer
12.
Answer is option (d) Cr(NO3)3
Since, Cr(NO3)3 will dissociate to give Cr3+ and 3 NO3-
In this case chromium (Cr) has +3 charge. SO, it will give strongest cation-dipole interaction.
All other options will give less than +3 charge for the cations.
13.
Molar mass of ethanol (C2H5OH) = 46 g/mol
So, 46 g of ethanol (C2H5OH) = 1 mol
1 g of ethanol (C2H5OH) = (1/46) mol
11.5 g of ethanol (C2H5OH) = (11.5/46) mol = 0.25 mol
Volume = 2.0 L
So, molarity = 0.25 mol / 2 L = 0.125 M
Answer is option (a)
14.
Answer is option (d) 1 and II, II and III
Since, all the options (I, II, III) are organic compounds and all are soluble with each other.
15.
Answer is option (d)
Ethanol is soluble in water due to hydrogen bonding
AlCl3 and Ca(NO3)2 are ionic compounds and hence soluble in water.
But hexane is nonpolar solvent and water is polar solvent and hence, they are immicible.
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