€ 50,00

Description

For hot ice and many other uses. High quality A.C.S. grade/GR grade reagent, 99.5+%. CH₃COONa·3H₂O CAS No. 6131-90-4 2 x 250g bottles For scientific and industrial uses only, not for food or drug use. Safety Data Sheet (SDS) included with package. Here is another factor in the hot ice formation, in addition to the super-saturation phenomenon: Sodium acetate anhydrous (CH₃COONa) has a much higher solubility in water (123.3 g/100 mL at 20 °C) than sodium acetate trihydrate (CH₃COONa·3H₂O, 46.4 g/100 mL at 20 °C). Even when the temperature has cooled, anhydrous sodium acetate can fully dissolve in aqueous solution, albeit being perhaps slightly super-saturated. However, once a crystallization seed is added, the crystal core that precipitated is CH₃COONa·3H₂O that has a much lower solubility in water. Not only does it dissolve less, it also grabs 3 molecules of water for each molecule of itself, making the solution even more concentrated, and therefore instantaneous crystallization of the whole solution and hot ice formation..

Quick procedures for making hot ice: In a small beaker, (every) 1.5 g of water was added to (every) 21.5 g of sodium acetate trihydrate and the mixture was heated to near boiling on a hot-water bath, with the beaker gently covered with a watch glass. If any solid still remained undissolved after 15 minutes of reaching near boiling point, the solid was filtered out with a filter paper and the liquid was collected, while still hot. If everything had dissolved, which in most cases it should, the filtering step was skipped. Allow the liquid to gradually cool to room temperature. The solution has then become supersaturated, and any condensation core (e.g. a speck of sodium acetate trihydrate) will trigger crystallization and release of heat.To see the hot ice form, a small bit a sodium acetate trihydrate was added to the solution, and instantly the solution solidified.

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Sodium Acetate Trihydrate CH₃COONa·3H₂O 99.5+% GR ACS Grade CAS No. 6131-90-4 AAdvance Instruments (500 g, Trihydrate)

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