All notes · HSC

1 chapter · 16 notes · all free

1. Laboratory Rules: Apron, Safety Glasses, Hand Gloves and MaskWhich glove can cause allergy, nitrile or latex, and why?
2. How to Behave during Laboratory ActivitiesWhat happens when a hot flask meets cold water? Learn the lab rules by matching them to what goes wrong.
3. Safe Techniques to Use Glass ApparatusWhich glass can take the flame, and which one melts in it?
4. Techniques to Keep the Laboratory, Equipment and Glass Apparatus CleanYou washed the burette, but drops of water still cling to it. Is it clean?
5. Washing Glass Apparatus: Cleaning MixturesWhat washes the grease out of a burette, and what do you do when that mixture turns green?
6. Advantages of Glassware and the Attack on GlassWhich three substances eat into glass, and why is glass still the laboratory's best container?
7. Chemical Balance: Definition, Kinds and UsesA balance that reads to 0.0001 g still cannot weigh NaOH pellets. Why?
8. Primary and Secondary Standard SubstancesWhy is Na₂CO₃ primary while NaOH is secondary?
9. Structure of the Paul Bunge BalanceWhich screw brings the beam back to zero, and where does the rider sit?
10. Rider, Rider Constant and Weight BoxThe smallest weight is 5 mg, yet the balance reads 0.0001 g. How is the gap filled?
11. Using the Paul Bunge Balance and Taking a WeightA rider at division 25 adds how much to the weighing? Work it out.
12. Molarity and Standard SolutionsIs 106 g of Na₂CO₃ dropped into a litre of water a 1 M solution?
13. Digital Balance: 2-digit and 4-digitTwo decimal places apart: do you know which substance goes on which balance?
14. Chemical Analysis, Measuring Cylinder and Volumetric FlaskTo make a standard solution, do you reach for the cylinder or the flask? And which surface of the liquid do you read?
15. Burette and PipetteWhy does a titration volume come out wrong? Because of how you wash, fill and read the burette.
16. Conical Flask, Wash Bottle and FunnelWhich flask does a titration happen in, and what does the wash bottle hold? Do not mix up the three.

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