4.9 study guide

Acidification lab and two gases lab

Lab information and results

Two gases lab

The gas created by the pure magnesium was lighter than air. This is proven by the fact that the small explosion was triggered in the inverted test tube, suggesting that the gas was trying to escape upward, through the solid glass. The gas produced by magnesium carbonate was more dense than the air. This was proven by the fact that the match went out in the upright test tube, suggesting that the gas in the test tube was not air.

Extra info: the gas made by the pure magnesium was hydrogen, and the gas made by the magnesium carbonate was carbon dioxide

Info about acidification lab

When you exhale onto water or blow bubbles in the water the carbon dioxide dissolves into the water and becomes carbonic acid, which is why the phenol red turns a lighter color. The Tums tablet which is an antacid dissolved more in the water acidified by carbon dioxide because the acidity of the water made the antacid dissolve faster and to a greater degree.

Miscellaneous info and errors:


Two gases:

  1. Not waiting 30 seconds after unstoppering test tubes (gas doesn't have time to escape)
  2. Unstoppering before inverting test tube (gas might escape)
  3. Break surface without stoppering test tube (gas will escape)
  4. Don't collect full test tube of gas (reaction will not be as strong)
  5. Having an air bubble in test tubes (less of the gas will be collected)
  6. Not stoppering tight (gas might leak)


  1. Don't blow bubbles in water for long enough (too little carbon dioxide)
  2. Cups don't have the same amount of water (there will not be a control)
  3. Put carbon dioxide in both cups (no control group)

PH info

The ph scale measures the acidity of a given substance by a number from 1 to 14, 14 is highly basic, while 1 is highly acidic.
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Ocean acidification

Normal ocean ph is 8.1-8.4

The ocean's has decreased by .1 (25% of the normal range)

If the ph gets too low the consumers (lowest on the food chain) will not be able to get shells or survive, therefore much of our ocean life would die

Notable materials (good to know)

Two gases:

  1. Sulfuric acid
  2. Magnesium
  3. Magnesium carbonate


  1. Phenol red (indicator)
  2. Calcium carbonate (tums)



Sinkholes occur when the ground below the surface collapses. Eventually the surface will crumble causing massive destruction.
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