Lab exam review
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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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Lab Exam Review

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Lab exam review

Lab Exam Review


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


Station 41

Station 4


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