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

Conclusion

The hypothesis that the marble surface coated with calcium oxalate will show the least amount of decay has been proven to be true.

Acid rain is causing serious damage to buildings, monuments and sculptures that have a lot of historical value. Although there are commercial sealants and methods available that can protect marble surfaces, they are not suitable for use on the surfaces of fine work such as sculptures. The strong resistance to acid rain afforded by applying oxalic acid on statues is currently being studied in Italy.

Also consider

Will the results differ if the science fair project was repeated using different methods of applying the coating of oxalic acid (e.g. spraying, dipping and polishing)?

The science fair project may also be repeated by using limestone instead of marble.
 

References

How to affect acid rain in buildings? - http://worldacidrainsecrets.blogspot.com/2010/01/how-to-affect-acid-rain-in-buildings.html

How dies acid precipitation affect marble and limestone buildings? - http://pubs.usgs.gov/gip/acidrain/5.html

Calcium oxalate – a surface treatment for limestone - http://www.ucl.ac.uk/archaeology/conservation/jcms/issue4/cezar.html
 

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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.