Question

Write the $pH$ value of the
1. Saliva (before meal)
2. Saliva (after meal)
3. Lemon juice
4. Colourless aerated drink
5. Carrot juice
6. Coffee
7. Tomato juice
8. Tap water

Answer 1

Hint: First we know $pH$ is a measure of the acidity (or base) of a Solution. Its value states the relative quantity of hydrogen ions (\[{H^ + }\]) contained in a solution. The $pH$ scale measures how acidic an objector solution is. The $pH$ scale ranges from \[1\] (the most acidic) to \[14\] (the most basic). If the $pH$ value is \[7\] then the object is neutral. An object (or a solution), whose $pH$ value less than \[7\] are acidic and greater than \[7\] are basic(alkaline).

Complete answer:
1) The $pH$ value of saliva before a meal is \[7.4\] , hence it is slightly basic to have a green colour.
2) The $pH$ value of saliva after a meal is \[5.8\] , hence it is acidic having a yellow colour.
3) The $pH$ value of Lemon juice is \[2.5\], hence it is a pink colour acidic solution.
4) The $pH$ value of Colourless aerated drink is \[6\], hence it is slightly acidic having a lime green colour.
5) The $pH$ value of Carrot juice is \[5.6\] , hence it is acidic having a yellow or green colour.
6) The $pH$ value of Coffee is \[5\], hence it is very acidic having a yellow colour solution.
7) The $pH$ value of Tomato juice is \[4.1\] , hence it is acidic having a beige colour.
8) The $pH$ value of Tap water is \[7\], hence it is neutral with green or lime green colour.

Note:
Note that $pH$ measurement is used in agriculture, wastewater treatment, industrial processes, environmental monitoring, and research and development. Water $pH$ is important to keep your body in balance and to regulate metabolic processes. A diet high in acidity will lead to weight gain, slower immune response, and susceptibility to disease. A diet too alkaline will lead to inability to metabolize key nutrients.