![]() ![]() More temperature means more kinetic energy which will make the particles inside move faster. If you want another example that might be easier for you to grasp, you can take a look at this video.ĭespite being soluble in room temperature water, caffeine’s solubility increases significantly with temperature as mentioned before. All the tests were done six times to check for accuracy and duplication.Īs the results were summarized, they showed that there was an increase in the solubility of caffeine in water which was the result of increases in the temperatures throughout the experiments. Hence, the solid concentration of the sample could be determined. Then it was weighed again to determine the new mass of the remaining solid part. Afterward, it was placed in an oven so that the solvent inside could go through the process of evaporation.Īfter evaporation, the vial was left to dry for nearly 5 hours. The vial was enclosed tightly and then weighed to figure out its mass. The upper portion of the solution was extracted with an appropriate and warm pipette. Then the procedure was repeated with different measurements and temperatures.Īfter the solution had settled after the 2 days, the caffeine which was not dissolved (the excess) could be seen in the lower region of the equilibrium cell. Then, the mixture was heated up in the equilibrium cell to the required temperature, along with continuous stirring.īefore sampling, to maintain the equilibrium, the water, and the undissolved solution were left to settle for exactly 2 days.įor every new measurement, an excess of a known mass of caffeine was included in the known mass of water. The water which was used was re-distilled deionized water.Īs per the gravimetric method, an excess of a known mass of caffeine was added to a known mass of caffeine. With a mass fraction purity that was greater than 98.5%, caffeine was considered soluble. The data of solubility was then correlated against temperature. Originally, the solubility of caffeine in water was calculated in Germany by a gravimetric method from 298-323K. Measuring the Solubility of Caffeine in Water Both water and caffeine are polar substances. Additionally, polar substances can dissolve together. The water molecule’s hydrogen is attracted to the highly electronegative oxygen and nitrogen atoms present in caffeine. On its own, caffeine has low solubility.Įven so, Caffeine is soluble in water to an extent as water can hydrogenate with caffeine molecules at six separate places. In its purest form, caffeine exists as a white, odorless, crystalline, or powder-like substance. ![]() Conclusion How is Caffeine Soluble in Water?
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