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In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with...
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Acid attacks on pin-tumbler locks.

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Nitric acid can successfully bypass standard pin-tumbler locks, but this burglary method is slow and poses significant health risks. Researchers tested this novel attack, finding it effective in most cases.

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Area of Science:

  • Forensic Science
  • Materials Science

Background:

  • A novel home burglary technique using nitric acid to compromise tumbler locks has emerged in Europe.
  • Understanding the efficacy and risks of this method is crucial for security assessments.

Purpose of the Study:

  • To investigate the technical mechanism of nitric acid attacks on pin-tumbler locks.
  • To evaluate the advantages and disadvantages of this specific burglary modus operandi.

Main Methods:

  • Four standard pin-tumbler locks were subjected to 65% nitric acid injection via syringe.
  • Locks were analyzed manually and with CT scanning to assess damage and functionality.
  • The time required to overcome the locks was recorded.

Main Results:

  • The nitric acid method successfully overcame the lock mechanism in three out of four tested cases.
  • In one successful attempt, lock pins were removed and the core turned within 22 minutes.
  • The acid demonstrably affected the internal lock components, including pins and springs.

Conclusions:

  • The study confirms that nitric acid can be an effective tool for bypassing standard pin-tumbler locks.
  • Significant drawbacks include the prolonged time required and substantial health hazards associated with handling nitric acid.
  • This method's viability is limited compared to other lock-defeating techniques due to its practical challenges.