Question
CH,COOHIplain your answer in 13.34 Which of the fhillowing in each pa he ble in water: (a) cyclohexane (CaH (b) propioni acid (CH,CH,COOH CHCHONa). (c) HCI or ethyl xplain in each case. H. 13.35 (a) Explain why carbonated beverages mus : restored it sealed containers. (b) Once the beverage has why does it maintain more carbonation when tof pn than at room temperature? Bet 13.36 Explain why pressure substantially affects the sol in water but has little effect on the solubility of Naci f of Cl in w es 13.37 The Henrys law constant for helium gas in water is 3,7 X 10 M/atm and the constant for Ni a t u 6.0 x 10 M/atm. If the two gases are each atm pressure, present at calculate the solubility of each gas ch13.38 The partial pressure of O, in air at sea level is 0.21 atm the data in Table 13.1, together with Henry's law, calaulat molar concentration of O2 in the surface water of an lake saturated with air at 20 °C and an atmospheric f 650 t torr Concentrations of Solutions (Section 13.4) 13.39 (a) Calculate the mass percentage of Na,SO, in a solutre containing 10.6 g of Na,SO, in 483 g of water. (b) An ore on tains 2.86 g of silver per ton of ore. What is the concentratie of silver in ppm? 13.40 (a) What is the mass percentage of iodine in a solution on taining 0.035 mol I2 in 125 g of CCl? (b) Seawater conta 0.0079 g of Sr per kilogram of water. What is the coocentr tion of Sr2 in ppm? 0 lain. 13.41 A solution is made containing 14.6 g of CH,OH in 164gd H,O. Calculate (a) the mole fraction of CH,OH, (b) the percent of CH OH, (c) the molality of CH OH 13.42 A solution is made containing 20.8 g of phenol (CH, 425 g of ethanol (CH,CH,OH). Calculate (a) the mole tion of phenol, (b) the mass percent of phenol, (e them ity of phenol 3.43 Calculate the molarity of the following aqueous soli (a) 0.540 g of Mg(NO,), in 250.0 ion. LiCIO4 . 3 HO in 125 mL o n. HO ded to 0,250 L
Explanation / Answer
Ans 13.35
a) The carbonated beverages contain gas i.e. carbon dioxide dissolved in the it under high pressure.
So if the container is not sealed properly , the pressure inside the container will not be maintained , and the gas will diffuse out.
b) The gas has higher dissolution in low temperatures. It attains higher kinetic energy on high temperatures and hence diffuse out when stored at room temperatures. So to mainatain its carbonation , it must be stored in referigerature (low temperature).
