Bottle A contains a dilute solution of vinegar and bottle B contains sodium carbonate solution, the colours seen in pH paper dipped in A and B are :
Direct Answer
Option A: orange, blue
Vinegar, being acidic, typically turns pH paper orange (pH ~2-3). Sodium carbonate solution is basic, causing pH paper to turn blue (pH ~11-12). Understanding pH indicators is crucial for assessing cargo compatibility, tank cleaning effectiveness, and handling hazardous substances safely (IBC Code, P&A Manual).
All Options
Detailed Explanation & Context
Vinegar, being acidic, typically turns pH paper orange (pH ~2-3). Sodium carbonate solution is basic, causing pH paper to turn blue (pH ~11-12). Understanding pH indicators is crucial for assessing cargo compatibility, tank cleaning effectiveness, and handling hazardous substances safely (IBC Code, P&A Manual).
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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