we filled up the 2 test tubes with lime water. One student blew into one of the test tubes using a straw and other student areated the other test tube. One of the test tubes showed in picture 1 changes to a white color because co2 was mixed by the breathing of the student.
Next the same thing will happen using 2 beakers filled with distilled water. after the process of areating and breathing a drop of universal indactor will be added to both beakers. The beaker on the right in picture 2 turns yellow this indicates that co2 reached the water and shows that it is more acidic in pH level. The other beaker was areated and changes to a green color that shows it is neutral.
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