Question

lland 2.) You have a new set of automobile radiators to test, but had forgotten to obtain antifreeze/radiator coolant to do the test. Let's say your test radiators are cheap/disposable. Based on the material that you covered in Chapter 8 (colligative properties), you know that you can use salt or sugar to increase the boiling point or lower the freezing point. Therefore, you attempt to do a quick-and-crude test on the radiators using ordinary Table Sugar or Epsom Salt, both of which are available to you in quantity. Sit? Note that the density of water is 1.00 g/mL. Obtain the molar mass of Table Sugar (sucrose) from the web. a.) You mix 68.4 g of table sugar with 100 mL of water. What is the boiling point of this solution? What is the freezing point of this solution? Hint: Use information on pages 226 and 227 of textbook. Show your work. Lyour ion for to b.) You mix 12.03 g of Epson Salt (MgSo.) with 100 mL water. Remember that so, is a polyatomic anion. Obtain the molar mass of Epsom Salt from the web. What is the boiling point of this solution? What is the freezing point of this solution? Show your Work. ritten as, so, nswer

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Answer 1

Sugar a) Criven. - 68.4g of is dissolved in loome water W - Mass of Solute = 68.49 M = Molar mass of Solwe - G Hg2 0 - 342g V = Volume of solvent = 100 ml But since 8= 1 g/me W = Mass of Dolvent = 100g K₂ CH₂O) = 0.512 K/mol kg 1 Kp (H₂O) = 1.86 K/mol kg ! A1 km = 0:512 X W2 X loro M2 W, = 0.512X 68.4 x 1000 342 100 AT = 1024 T- T = 1024 T = 100+ 1.024 = 101024°C 110 - kc ) = 1-86 x 68:4 XLORO 342 100 Die = 3.72 Top - Tp = 3.72 T= 0 -3.72 - - 3 42°C

b) 10.03g = W W t of solute; M = Molax mass of Solwe 100 mA = V - Volume of bel vent = 120:30 100g = W = Wt. of Solvent 9-25 TE ? R=0.512 K/mol kg KR= 1.86K) mol kg. AT = Kb.mxi (i-2 for Mg 504) 0.512X 12.03 x 1000 X 2 bince Dissociation) 120.3 100 Masou 2 Mg + 2 + 5042 1.024 T 1.024 + Tb To 101.024°C ATE=Kc mi - 1.86x 12.03 x 100 x2 120.3 100 -3.72 : Te = 0-3.72 = - 3.92°C Eepson halt aro. c) 3.429 mixed Sugar & 1.2039 together Osmolarity of sugar - 3.429 X - Molar mass vel) = 3.42 x 1000 = 0.4 M. 342 0 Osmolarity of Epsom salt 1.203 x 1007 - OLM. 120.3. 100 Tcal Oimalasiny - 4+2 +0:2M 200m osmola