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The molecular weight of a chemical compound tells you how many grams are in one mole of that compound. This information can help you understand how much of a substance you need to purchase or make in order to complete your experiment, as well as how many moles are in a batch of that compound.
Sodium stearate is the sodium salt of stearic acid, with the chemical formula NaCHO2O. It is a white, oily powder with a smooth feel and fatty odor. It is soluble in hot water or alcohol. Its aqueous solution is alkaline due to hydrolysis.
It is an emulsifier and thickening agent. It is used in cosmetics, rubbers, latex paints and inks as a coating, binder and lubricant. It is also found in foods as an additive and a fat substitute. It is a mild irritant to the skin and eyes. It is generally considered to be safe for human consumption.
The stearate molecule has both hydrophobic and hydrophilic properties. The hydrophobic portions of the molecule attract non-polar molecules, such as oils and fats, while the hydrophilic portion attracts polar molecules, such as water. This allows it to emulsify oil and water, allowing the two substances to mix more easily.
Sodium stearate is produced by saponifying natural oils, such as coconut and palm oil or animal fats, such as tallow. It is a common ingredient in today’s soaps. It is also used as a coating for pharmaceutical tablets to prevent them from sticking together.