Law of conservation of mass

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In each experiment we tested the Law of conservation of matter. In the first one after trial after trial the mass before mixing went down and after mixing the mass went up, after mixing the chemicals looked like white gell. in the second experimentwhen we put the white tablet in water and then that made gas. the mass went down a lot after shaking the bottle. One difficult thing i had to deal with was makng the air not effect the expirement while finding the mass of the water bottle. I conclude that the Law of conservation of matter is true.