The colour of the pH paper strip turned red when it was dipped into a sample. The sample could be:
Direct Answer
Option D: dil. HCI acid
A pH paper strip turning red signifies a strongly acidic solution, typically with a pH value of 1-3. Dilute HCl (hydrochloric acid) is a strong acid, consistent with this observation. Understanding pH is critical for cargo compatibility, tank cleaning, and safety, as outlined in ISGOTT and P&A Manuals.
All Options
Detailed Explanation & Context
A pH paper strip turning red signifies a strongly acidic solution, typically with a pH value of 1-3. Dilute HCl (hydrochloric acid) is a strong acid, consistent with this observation. Understanding pH is critical for cargo compatibility, tank cleaning, and safety, as outlined in ISGOTT and P&A Manuals.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
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