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I wanted to know how to dissolve sodium oleate powder in distilled water? Does it have to be at a certain temp? I need a 2% solution

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A product information by Sigma-Aldrich, a chemical supplier, cites Merck Index regarding the solubility of sodium oleate. And states "It is also soluble in water (approximately 100 mg/ml)", in other words, 10 mass%. Since this value is larger than the 2 mass% requested by you, and provided sodium oleate is a surfactant anyway, just go ahead. A gentle warming, like 30 to 40 Celsius, may accelerate the process, though.

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