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Universal Indicator Lab Report

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Experiment 1 In this experiment we added different Alkali metals to water and noted the observations with Universal Indicator. PROCEDURE 1. First we took some amount of water in a beaker and added 2-3 drops of Universal Indicator 2. Then we cut the Sodium metal into small pieces 3. Then we added the cut pieces to water in the beaker and noted the change observed. 4. We repeated steps 1-3 for Lithium as well OBSERVATIONS 1. Upon adding the drops of Universal Indicator we noticed the short color change in water from colorless to green to colorless proving that water is a neutral solvent. 2. When we cut the Sodium metal into pieces ae observed that being metal it highly ductile and soon after cutting we noticed that it was extremely shiny on the inside. After a few seconds we …show more content…

Universal indicator being green shows that the water is neutral 3. Sodium darting on water shows the reaction was vigorous in nature and this was also due to the fact that the hydrogen was propelling the piece in the water 4. The sodium piece becoming spherical shows that the reaction was exothermic. The heat produced melted the sodium piece and made it spherical as the melting point for sodium is low and the heat produced is sufficient to melt it . 5. The sodium piece darting on the water shows that the metal is light and can float on the water 6. The brisk effervescence is a result of the hydrogen that is released 7. The water turning purple shows that an alkaline substance is formed this substance is sodium hydroxide. 8. On taking the substance out of the beaker it starts sparking because energy produced in air increases and the hydrogen produced increases and therefore the sparking is seen as hydrogen is combustible. EQUATIONS 1. 2Na + 2H2O ------ 2NaOH + H2 2. 2Li + 2H2O ------- 2LiOH + H2 3. 2K + 2H2¬O ----- 2KOH + H2 LIMITATION Potassium was not used for the experiment because it was not available in the laboratory and is highly explosive as compared to the other two Alkali

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