Download Problems in Physical Chemistry by A.E. Somerfield (Auth.) PDF

By A.E. Somerfield (Auth.)

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By A.E. Somerfield (Auth.)

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36 103. W. in water 20 ·2; in cyclohexane 51 ·9 104. 294 105. e. S„) 106. C a H, 107. CH 4 108. CO, 62; H 2 , 15; CH 4 , 23 109. 22-8 cm3 of C2H„; 10-8 of CH 4 E. EQUILIBRIUM, DISSOCIATION AND LE CHATELEER'S PRINCIPLE 113. K = 16; 0-97 moles of ester 116. K=16;K = 1/16; T a ; No 121. 18*75 percent 122. 82-1 123. 43 -7 per cent 125. 78· 2 per cent dissociated into 3 ions 126. 30-6 per cent F. IONIC EQUILIBRIA, pH, INDICATORS AND SOLUBDHTY PRODUCTS 128. 1-44 acid; 8-89 alkaline 129. (a) 1-62, (b) 8-33; (a) 10"«, (b) 3-2 X 10-», (c) 15-9, (d) 5-0 x 10-" 130.

179. Given that the molar conductivities of the ions (at infinite dilution) are: NH 4 + , 64-5; OH~, 172, estimate the molar con­ ductance at infinite dilution of ammonium hydroxide. Hence calculate the degree of ionization of ammonium hydroxide (or the degree of hydrolysis of ammonia) in 0-1M and 0-01M solution, where the molar conductivities are 3-10 and 9-66 mho cm2 respectively. Apply Ostwald's dilution law, and calculate the ionization constant, Kb, for ammonium hydroxide. 180. g. NaCl) is placed between parallel, plane electrodes, and a 23 potential difference applied.

7 , + 6 , + 4 , + 6 161. + 2 , + 3 , + 4 , + 5 ; + 5 168. + 1 ; 2C10- + S 0 2 = Cl2 + S 0 4 2 H. ELECTRICAL PROPERTIES OF SOLUTIONS 172. Λ = 4 mho cm2 177. 1-34 per cent; 4-18 per cent; 1-8 X 10"5 179. 236-5 mho cm2; 1 -3 per cent; 4-1 per cent; 1 -7 X 10~5 181. 0-0336 amp; 0-67 183. 0-66 I. PARTITION COEFFICIENT 185. 4 g + 0 - 8 g = 4-8 g; 4 - 4 g 186. The ratio (concentration in benzene)/(concentration in water) 2 is approximately constant. The acid is associated in benzene in pairs. 188. (a) 9-0g; (b) 8-18 + 1-49 = 9-67g; (c) 6-92 + 2-10 + 0-56 + 0-29 = 9-87g.

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