Question

When CO2 combines with water it forms carbonic acid. How does this explain the phenol red result?

Answer 1

Answer:

Detail is given below.

Explanation:

First of all we will understand the pH.

pH:

pH is the negative log of hydrogen ion concentration.

pH = -[logH⁺]

It means when the  ions concentration increases pH will be low and when H⁺ concentration ions decreases pH will be greater. The pH range is 0-14.

If the pH is 7 the solution is neutral, if it is less than 7 the solution will be acidic and above 7 the solution is basic.

when CO₂ is added with water carbonic acid is formed and yield H⁺ ions which decreases the pH thus its color changes from red to yellow just like phenolic indicator. When phenol red is added into the acidic solution the color changes from red to yellow.

and when carbon dioxide is take off from photosynthesis process it means H⁺ ions are going to be decreased thus color changes from yellow to red.

Answer 2

CO2 combines with water to form carbonic acid. This decreases the pH leading to a yellow color of phenol red.

Phenol red is an indicator that has a red color in a basic medium and a yellow color in an acidic medium.

Given that the following reaction occurs; CO2(g) + H2O(l) ------> H2CO3(aq), the pH of the systems drops to a value less than 7 (acidic).

As a result of this, a yellow color is observed with phenol red.

Learn more:https://brainly.com/question/17680282