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Lab Exam Review. What To Expect. Time Allotted: 75 minutes Stations: 4 (15 min/station) 1 Lab Component for each unit Out of: 40 (10 marks/station) 10% of Final Grade You are allowed to bring your lab book into the exam as a resource.

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Presentation Transcript
what to expect
What To Expect
  • Time Allotted: 75 minutes
  • Stations: 4 (15 min/station)
    • 1 Lab Component for each unit
  • Out of: 40 (10 marks/station)
  • 10% of Final Grade
  • You are allowed to bring your lab book into the exam as a resource.
  • You will require a pencil, eraser, ruler, and calculator
what to expect1
What To Expect
  • Station 1: Determining the Ka of a weak acid
  • Station 2: Reactions of alcohols
  • Station 3: Determining molar enthalpy
  • Station 4: Identifying the type of an unknown solid
pay close attention
Pay Close Attention
  • As I work through each demo it is your responsibility to note any key procedures or calculations required to complete the lab. You will not be receiving a summary handout.
station 1
Station 1
  • Purpose: to determine the ionization constant Ka for a weak acid
  • Materials Provided:
    • Burette
    • Retort Stand
    • Burette clip
    • 10 mL volumetric pipette
    • 250 mL Erlenmeyer flask
    • phenolphthalein indicator
    • Sodium hydroxide solution (concentration will be given)
    • Weak Acid (concentration unknown)
    • The pH of the unknown acid.
  • You will be required to write a procedure, record observations, and complete the analysis questions required to determine the Ka

pH of Acetic Acid used in demo = 2.34

station 11
Station 1
  • Sample Ka: Acetic Acid
  • CH3COOH CH3COO- + H3O+
  • pH = -log[H3O+] Therefore [H3O+]= 10-pH
  • This calculation will require an ICF and ICE table!!
station 2
Station 2
  • Purpose: to identify an alcohol as either a primary, secondary, or tertiary alcohol
  • Materials Provided:
    • 2 unknown alcohols (alcohol a and b)
    • Test tube rack
    • 5 - 10 mL graduated pipettes
    • 4 test tubes
    • 4 rubber stoppers
    • HCl solution
    • KMnO 4 solution
  • You will be required to write a procedure and record observations. Based on your observations you will determine the types of alcohols reacted
station 21
Station 2
  • Primary alcohols react quickly with KMnO4
    • Two step oxidation to carboxylic acids
  • Secondary alcohols react slowly with KMnO4
    • One step oxidation to ketone
  • Tertiary alcohols do not react with KMnO4
    • Cannot undergo oxidation
  • Primary alcohols do not react with HCl
    • Separate into two insoluble layers
  • Secondary alcohols react slowly with HCl
    • One layer with cloudy precipitate that slowly disappears
  • Tertiary alcohols react very quickly with HCl
    • One layer with cloudy precipitate that disappears very quickly
station 3
Station 3
  • Purpose: To determine the molar enthalpy of solution for a given ionic solid.
  • Materials Provided:
    • Coffee cup calorimeter
    • Thermometer
    • 100 mL graduated cylinder
    • Electronic balance
    • A given ionic solid
    • Deionized water
  • You will be required to write a procedure, record observations, and complete the analysis questions required to determine the molar enthalpy of the given ionic solid
station 31
Station 3
  • Q = mc∆t
    • m = mass, c = specific heat capacity, ∆t = change in temperature
    • Specific heat capacity of water = 4.19 J/goC
    • Density of water = 1.0 g/mL
  • ∆H = -Q
  • ∆H = n∆Hsol
station 4
Station 4
  • Purpose: To classify an unknown substance as a molecular solid, ionic solid, network covalent solid, or metallic solid
  • Materials Provided:
    • Unknown Solid
    • 100 mL beaker
    • Deionized water
    • Conductivity meter
    • Mortar and pestle
    • Crucible
    • hotplate
  • You will be required to write a procedure and record observations. Based on your observations you will determine the type of solid
ad