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Alum crystals are made of aluminum potassium sulfate, and are usually made by slowly dehydrating an aqueous solution of aluminum potassium sulfate. So, when you put water back onto a dried crystal, you will begin to dissolve it again.

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How do you obtain pure sugar from a solution?

To obtain pure sugar from a solution, you can use the process of evaporation or crystallization. Start by heating the solution to evaporate the water, which will leave the sugar behind as a solid. Alternatively, you can cool the solution to allow sugar crystals to form, then filter out the crystals from the remaining liquid. Finally, wash the crystals with a small amount of cold water to remove impurities before drying them.


When removing excees penetrant with water the wash time should be?

The wash time when removing excess penetrant with water should typically be between 5-10 minutes. This allows enough time for the penetrant to be effectively removed without leaving any residue behind. Longer wash times may be required for certain situations, such as when dealing with difficult-to-remove penetrants.


What would be the difference in size of crystals between a salt solution that has been evaporated by heating with a Bunsen burner and one that was left to evaporate in normal room temperature?

When you do it on the Bunsen burner it heats quicker so you get a final product sooner. You know it's finished when you start to see white powdery looking stuff around the sides. To wash it run it under cool water and the powder should rinse out with the water.


Do you need to wash your apples with soap and water?

yes that is if you fresh pick them or store bought. if they are already sanitized no, but you should still wash them.


Why is alum used as mordant?

Alum is used as a mordant in dyeing fabrics because it helps the dye adhere better to the fibers, resulting in brighter and more permanent colors. It also helps to improve the wash-fastness and light-fastness of the dye on the fabric.