Answer :
We need a color key to determine the pH of a solution using pH indicator paper.
What is pH?
pH is the measure of the hydrogen ions concentration in a solution which means the measure of acidity or alkalinity of the solution.
Generally, the pH scale ranges from 0 to 14.
A solution having a pH less than 7 is said to be acidic whereas a solution having a pH more than 7 is considered basic or alkaline
A solution having a pH equal to 7 is said to be neutral
What are pH indicators?
pH indicators are weak acids that are found as natural dyes and that change color to show how many H⁺ (H3O⁺) ions are present in a solution.
The substance you are analyzing has an acidic, basic, or neutral pH value, which is calculated from the negative logarithm of H⁺ concentration.
The paper form of pH indicators is typically dipped into solutions and then removed for comparison against a color/pH key. Usually, the liquid form of pH indicators is added directly to solutions.
Thus, a color key or pH key is needed to determine the pH of a solution using pH indicator paper.
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