When stored properly under the conditions recommended, caustic soda solution has a virtually unlimited shelf life. Properties, applications, storage, safety, and compliance Graph 10 on the next page can also be used to determine approximate volumes of 50% naoh and water necessary to achieve a particular dilution
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For example, you want to produce 3,000 gallons of a 25% naoh solution and want to know how much water and 50% naoh are needed to accomplish this goal.
The dissolution process releases a large amount of heat, which causes the temperature of the solution to rise
Care must be taken when preparing concentrated solutions of sodium hydroxide, because of the large amounts of heat released. Nist subscription sites provide data under the nist standard reference data program, but require an annual fee to access The purpose of the fee is to recover costs associated with the development of data collections included in such sites Your institution may already be a subscriber.
This document provides data on the specific heat of aqueous solutions of sodium hydroxide (naoh) at different concentrations and temperatures The specific heat, measured in kj/kg°c, decreases as the concentration of naoh or the temperature increases. Caustic soda is a clear, colorless solution of sodium hydroxide in water The solution is highly alkaline, highly corrosive, and aggressive on a range of materials such as aluminum, magnesium, zinc, glass, enamel and many plastic materials.
The solution gets warmer by diluting with extra water, but no violent reaction
I suggest to do a test, if the temperature raise is concerning you, e.g Because of the tubing temperature resistance. Product information for caustic soda solution (naoh 50%)