Question

3. Dilutions: Saline solution, used in IV bags, is 0.900% (m/v) NaCl. Suppose that, as a hospital technician, you are asked to prepare 200. L of this solution for use that afternoon. The stockroom contains a supply of concentrated (35.096 m/v) NaCl solution available for use. Describe in words or pictures how you would prepare this solution, supporting your procedure with a calculation. Available materials include distilled water and a volumetric container of the appropriate size that you need (just call it a volumetric container - a "flask" that large would be pretty unwieldly!). 4. Colligative Properties: Consider the following solutions: 1) pure water, and 2) a 0.100 M solution of NaCl. Answer the following questions by circling the correct answer, and then explaining your choice (with words or pictures). [A] Which has the lower freezing point? pure water 0.100 M NaCl soln [B] Which has the lower boiling point? pure water 0.100 M NaCl soln (C) Which has the higher vapour pressure? pure water 0.100 M NaCl soln

Answer 1

- 0-9007 m nach means 100 me Solution contains 0-900 9 nach. <Volume of solution here 2 200 1 x 10 ml 2 2004 103 mL tom a mass nach volume of solution X100 t 6.900 a mass Nacı xoo 200- x 103 mL mass nach needed for this a a 1800g 1-80x 10 g. to get this mass of wall from 35-04 m > so we Nael have Solunon- mass volume nach x 1007 of solution Game) 35-07. z 1-foxlog x2005. volume solution needed 2 5142-86 ml xu Solution volume of 3507 add This 2 5.14 L In a container of 200 L volume mark, using SL volumetric container add 35.07 m Nail to add SL using Il volumen Corroversic Sprey c the Ele zool container and then sa 100 ml approprete) 35-ot. m nad Sohnion and the add Yom of no caralloble Ne 35.0tm wall solution using loom and Yome volumemic RD containers respectively, and then add distilled water to get the total volume of solution to 2002 to give OS SL wall soutian. w 0-900 + of 2ool

k) in solution, soluse es present. - Presence of soute decreases the freezing point of solution means freezing point 25 less than freezing point of pure water - Presence of soluse increases the Bolling Point of Socorion greater than pure walen). - presence of solure causes decreases number of gaseous water molecules on So v results in less vapor pressure there in the solution, Pressure a moles a molecules lower freezing point pure water 6-loom Nact 1 Loc solution rower Bolning point ore water Pure water 2100°C to 0.00M NEC 0-10om wall looc recreoseos Higher vapour Home pressure Pure waren o toom nact solution. the solvent chemical molecules have gas gas con sond phases. e below heezing in freezing point to gow, they gable so leads to new Present of soure, lowers potential so that solvent tendency to to move move to to 30 solutions have are stabie sowent, leads to decrease In case of converting nood Above boiling point in boiling pont. point of freezing e below