Solution Exercise - I

University:
Widener University
Course:
CHEM-101 | Intro to Chemistry I
Academic year:

2022
Views:

171

Pages:

1
Author:

ddifenwadbyx

Page # 36 SOLUTION EXERCISE – I UNSOLVED PROBLEMS Q.1 Suppose a solid solution is formed between two substances, one whose particles are very large and the other whose particles are very small. What kind of solid solution is this likely to be? Q.2 Define the following terms: (i) Mole fraction (ii) Molarlity (iii) Molarity (iv) Mass percentage. Q.3 Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 mL–1? Q.4 A solution of glucose in water is labelled as 10% w/w, what would be the molality and mole fraction of each component in the solution? If the density of solution is 1.2 g mL–1. then what shall be the molarity of the solution? Q.5 How many mL of 0.1 M HCl are required to react completely with 1 g mixture of Na2CO3 and NaHCO3 containing equimolar amounts of both? Q.6 An antifreeze solution is prepared from 222.6 g of ethylene glycol (C2H6O2) and 200 g of water. Calculate the molality of the solution. If the density of the solution is 1.072 g mL–1, then what shall be the molarity of the solution? Q.7 What role does the molecular interaction play in a solution of alcohol and water? Q.8 Why do gases always tend to be less soluble in liquids as the temperature is raised? Q.9 State Henry's law and mention some important applications? Q.10 What is meant by positive and negative deviations from Raoult's law and how is the sign of mixH related to positive and negative deviations from Raoult's law? Q.11 The vapour pressure of water is 12.3 kPa at 300 K. Calculate vapour pressure of 1 molal solution of a non-volatile solute in it. Q.12 Based on solute-solvent interactions, arrange the following in order of ncreasing solubility in n-octane and explain. Cyclohexane. KCl, CH3OH, CH3CN. Q.13 If the density of some lake water is 1.25 g mL–1 and contains 92 g of Na+ ions per kg of water, calculate the molality of Na+ ions in the lake. Q.14 Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol. Q.15 Calculate the depression in the freezing point of water when 10 g of CH3CH2CHClCOOH is added to 250 g of water. Ka = 1.4 × 10–3, Kf = 1.86 K kg mol–1. Q.16 19.5 g of CH2FCOOH is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.0ºC. Calculate the van't Hoff factor and dissociation constant of fluoroacetic acid. Q.17 Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 25ºC. Assuming that it is completely dissociated.