Guidelines for Accurate Powder Consistency Testing: pH and Conductivity Measurement

Dec 13, 2025

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This guide provides essential instructions for conducting consistent powder consistency tests. Key factors include keeping sample sizes uniform, controlling the volume of liquids added, and selecting appropriate containers. Proper use of pH paper is crucial; cut it to fit the testing container, avoid direct contact with solutions, and use a stirring rod for accurate readings. The testing process involves comparing powders across a spot plate with various solutions, ensuring that all tests are conducted in aqueous environments for reliable conductivity results.

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Guidelines for Accurate Powder Consistency Testing: pH and Conductivity Measurement

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Can’t Judge a Powder
Consistency • Be consistent with: • The size of the sample • The volume of water or any other liquid added • Perhaps, the container for testing
Proper usage of pH paper • Cut into small pieces that will fit into container for testing • Do not place pH paper in a solution • Use the tip of a stirring rod to spot a small piece of pH paper • Read pH immediately

Testing Various Powders • Across each spot plate • Water, 1M HCl, 1M NaOH, 2-propanol(isopropyl alcohol), methanol • First column: pH paper • Second column: 2 drops Ca(NO3)2 2 drops Ba(NO3)2 2 drops AgNO3