Praktikum Kimia Dasar - Modul 1&2 Keamanan Kerja & Pengenalan Alat di Laboratorium

Main Ideas & Lessons

Module 1: Occupational Safety & Health (K3) in the Laboratory

• Introduces occupational safety and health practices when working in a chemistry laboratory.
• Uses ethanol as a worked example of how to read chemical information from a container/label:
  • Identify the chemical formula and understand the concept of molecular structure/“shape.”
  • Recognize danger symbols, including:
    • Flammability (symbol indicating “on fire” risk)
    • Irritation (symbol indicating irritation effects)
  • Explains that the label typically includes information about:
    • Hazards
    • Prevention methods
    • What to do in case of a work accident involving the material
• Explains that the same information can be obtained through an MSDS (Material Safety Data Sheet), accessible via the internet.
• Uses calcium chloride (solid) as another example of reading packaging information:
  • Notes items such as:
    • Chemical name
    • Chemical formula
    • Molecular weight
  • Includes danger symbol(s) (e.g., irritating)
  • Mentions that more detailed hazard/impact information is available through MSDS.

Module 2: Introduction to Laboratory Equipment (Alat Laboratorium)

Provides brief functions of common laboratory tools, including glassware, measuring devices, stands/supports, and transfer/separation tools.

• Beaker (glass beaker/baker)

  • Functions as a container for holding chemicals.
  • Used to mix, dissolve, or heat substances that don’t require high precision.

• Measuring pipette (pipette)

  • Transfers liquids with precise volume from one container to another.
  • Typically used with a propipette (propipad):
    • Attach the pipette tightly to the propipette.
    • To draw liquid: turn the top part downward.
    • To release/pour liquid: press the button at the top.

• Flask (Erlenmeyer/“airler flask”)

  • Similar uses to a beaker: hold, dissolve, mix, and heat chemicals.
  • Key difference: the cone-shaped top makes it easy to shake.
  • Available in various sizes (example mentioned: 250 mL).

• Burette

  • Measures and dispenses liquid volume accurately and precisely.
  • Features a rotating tap/stopcock:
    • Perpendicular = tap closed
    • Parallel = tap open (liquid flows out)
  • Commonly used during titration.

• Ring stand / stand (static)

  • Used to support/propping up equipment so it remains stable.

• Burette clamp (with stand)

  • Example workflow (procedure steps):
    • Attach the burette clamp to the stand.
    • Rotate/adjust the clamp body.
    • Insert the clamp into the stand.
    • Install and tighten until stable.
    • Open the lever (as mentioned) and clamp the stem to secure the burette for titration.

• Dropper pipette

  • Transfers/adds liquids or chemical solutions from one container to another.
  • Procedure steps:
    • Press the rubber top.
    • Dip into the liquid.
    • Release the rubber.
    • Pull to draw the liquid.

• Volumetric flask (measuring flask / volume flask)

  • Used to make solutions or dilute solutions.
  • Two types:
    • Colorless flask: for non-photosensitive solutions
    • Brown/amber flask: for photosensitive/light-sensitive chemicals

• Stirring rod

  • Stirs two or more chemicals to form a homogeneous solution.

• Glass funnel

  • Transfers solution from a wide opening to a small opening.
  • Also useful when material may be powder/solid, not only liquids, to reduce spill/accident risk.

• Test tube

  • Container for mixing, cooling, heating, or observing reactions.

• Test tube rack

  • Holds/stores test tubes.

• Test tube clamp

  • Used to clamp or remove a test tube after heating.

• Crucible (crus cup / crucible) + crucible tongs (cruel clamps)

  • Crucibles are used for ashing in a furnace.
  • After ashing, the crucible is very hot, so special tongs are required.
  • Conceptual procedure steps:
    • Use tongs to open the lid of the crucible (first method).
    • Use tongs to take the crucible (second method).
  • Also used to close the crucible when needed.

• Pycnometer (pygmometer)

  • Used to find the density of a liquid.

• Weighing bottle

  • Used to determine the mass of a liquid.

• Graduated measuring cup / measuring cylinder

  • Examples mentioned: 50 mL and 25 mL
  • Used to measure liquid volume.

• Spatula

  • Used to take/remove solid materials:
    • One end for larger quantities
    • Another end for smaller quantities

• Watch glass

  • Used for weighing during the drying process (for filtered/sedimented materials).
  • Can also be used to cover beakers.

• Separating funnel

  • Used to separate two immiscible liquids.
  • Liquid is poured in from the top.
  • The liquid to be removed is drawn from the bottom tap/valve by opening it.

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Speakers / Sources Featured

• No specific named speaker is provided in the subtitles.
• Source mentioned: MSDS (Material Safety Data Sheet) (accessed via the internet).