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The protection afforded by calcium oxalate against acid rain Featured science projectScience project video

Observation

The marble tile coated with calcium oxalate dissolved the least in the vinegar solution.

Coating Dissolving rate of marble tile in acidic solution (in grams)
  Start Day 1 Day 2 Day 3 Day 4 Day 5
No coating 100 75 56 43 31 19
Sealant 100 96 91 85 79 73
Calcium Oxalate 100 98 95 91 85 79

The above results were then plotted onto a graph.
 

 calcium oxalate science fair project

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Complexity level:
7
Project cost ($):
50
Time required:
1 day for preparation, 5 days for observation
Material availability:
Contact a supplier of commercial marble sealant in your vicinity
Safety concerns:

Warning - An adult is required for the purposes of handling oxalic acid and gloves should be worn at all times. Oxalic acid can be absorbed through the skin and it will react with calcium in the bloodstream, forming kidney stones.