Question

In bases, methyl orange turns:
A. red
B. green
C. yellow
D. blue

Answer 1

Hint:With increase in the pH of the solution, the acidic nature of the solution decreases. For any solution with high acidic value the pH paper shows the color red and for the solution with basic value the pH paper shows the color blue. On the basis of the acidic and basic value the color of the solutions vary in the pH paper.

Complete step by step answer:
The acid-base indicators are also known as pH indicators. The main phenomenon of pH indicator is that it changes its color with the change in pH.
The acid-base indicators are prepared by dissolving weak acid or bases so that it easily dissociates to form ions. The pH indicator or acid-base indicators are used to determine acidity and basicity of the solution.
Methyl orange is the chemical used as a pH indicator. It is usually used in the titration process as it gives distinct color change with the variation of pH of the solution.
In the titration process, few drops of methyl orange are added if the solution is highly acidic it turns to red and as the acidic nature decreases it changes its color to orange than yellow in the basic solution.
Thus, in bases the methyl orange turns yellow.

Therefore, the correct option is C.

Note:The pH indicator does not sharply change its color at a particular pH of the solution but they change their color at a narrow range of the pH. The pH range of methyl orange is 3.1-4.4. When methyl orange is used as the pH indicator in the titration process, the titrant is added to the solution until the first trace of orange color is seen. If the solution turns red, the reading is exceeded from the equivalence point.