Question

Take two test tubes fill 1/4 of them with lime water. Close the test tubes with two hole rubber corks and insert tubes. Blow and suck the air simultaneously and observe your findings. Same experiment can be done by taking phenolphthalein. What do you observe and write the reasons for it? ​

Answer 1

Answer:

gjsndbjxnxfh j bbxbxbxjxjxj

Answer 2

Lime water turns milky when air is blown

Explanation:

• Lime water is $Ca(OH)_2$ and when we blow air into a solution of lime water, it reacts with water and $CO_2$ (from exhalation) to form $CaCO_3$ which renders lime water milky.

$Ca(OH)_2+CO_2+H_2O \rightarrow CaCO_3+H_2O$

• Incase if phenolphthalein , however , which is an acid base indicator, different changes are noticed.
• Phenolphthalein is colorless in acidic form and pink in basic form. Lime water is a is a base. Lime water is a base. When phenolphthalein is added to the solution, the color of the solution turns pink.
• When we blow air into the above solution, $CO_2$ from our breath reacts with lime water solution to form carbonic acid , thus making the solution acidic. This changes the color of phenolphthalein to colorless. This happens due to excess of $H^+$ions in the solution now making the solution acidic.