2. Methods

2.1    Equipment

  • 200 ml Coca Cola
  • 200 ml 1% Amylase
  • 200 ml Orange juice
  • 200 ml Tea
  • 200 ml Coffee
  • 200 ml Distilled Water
  • 200 ml Natural Acidity White Vinegar
  • 250 ml Glass Beakers (x7)
  • Bleach
  • Measuring Scale (To 3 Decimal Place)
  • Paper towels
  • Marble Chips
  • A few pieces of chalk
  • Tweezers
  • Rubber gloves


2.2    Diagram


2.3    Procedures


Preparation for experiment:


1. Measure mass of each marble chip and note it down on its beaker
2. Fill beakers to 200ml with each type of liquid.
3. Disinfect with 1 ml of bleach (to prevent mould and bacteria growth)
4. Drop chalk and marble chips into their respective beakers at the SAME TIME.
5. Seal the beakers with cling-wrap (to prevent the loss of liquid due to evaporation for most of the duration of the experiment)
6. After checking everything, put beakers back for refrigeration. (to prevent mould and bacteria growth)


Data collection:


In a one day interval,
1. Remove chalk and marble chips from beaker by tweezer
2. Dry with cloth
3. Observes visual changes to chalk
4. Record mass of marble chips twice and take down the average weight
5. Record mass difference and observe any trends
6. Put chalk and marble back in the beakers and reseal them.


2.4    Risk Assessment and Management
Table 1


1. Glass beakers shattering and thus injuring ourselves on glass fragments
Likelihood: 2
Severity: 1
Risk = 2 (Tolerable)
Precaution: Wear gloves and safety goggles while handling the equipment and be careful.


2. Stale liquid tested with chalk could be toxic if consumed
Likelihood: 1
Severity: 2
Risk = 2 (Tolerable)
Precaution: Do not consume any of the beverages used in the experiment.


3. The bleach is extremely hazardous to our health should it be consumed or the gases inhaled.
Likelihood: 2
Severity: 3
Risk = 6 (Substantial)
Precaution: Keep our faces a safe distance from the bleach and ensure that we are wearing gloves when handling the bleach and liquids.


2.5    Data Analysis


1. Dry the marble and clean it before placing it on the weighing scale. Check for an increase or decrease of mass of the marble piece. The more drastic the decrease, the more marble has corroded, showing how corrosive the particular liquid is to our teeth.


2. Visually observe the chalk. Check for any visible corrosion on the chalk or visual differences. The more drastic the difference, and over the shortest amount of time, the more likely it is that the liquid can stain our teeth very easily.


3. Using the data collected from the chalk and marble pieces, conclude which drink would have the greatest effect on our teeth. Use the difference in mass and visual observations to do so.

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