Methyl red is used as a pH indicator or for the identification of some bacteria.
The solution of NaOH in methyl orange indicator will turn from yellow to red. Methyl orange is an acid-base indicator that changes color in response to a change in pH. In the presence of a strong base like NaOH, the indicator will change to a red color indicating the basic nature of the solution.
A suitable indicator for an endpoint at pH 10.5 would be methyl orange. At this pH, methyl orange changes color from red to yellow, making it a good choice for acid-base titrations that end around pH 10.5.
Methyl Orange is red in an acidic solution.
By titration with alkaline on methyl-red indicator (pH<6)
If you omitted methyl red in the reaction mixture, you would not be able to visually monitor or detect the pH change in the reaction. Methyl red is a pH indicator that changes color in response to pH changes, so without it, you would not be able to accurately determine when the reaction has reached a specific pH endpoint.
Methyl Red
Methyl red is an adequate indicator.
The solution of NaOH in methyl orange indicator will turn from yellow to red. Methyl orange is an acid-base indicator that changes color in response to a change in pH. In the presence of a strong base like NaOH, the indicator will change to a red color indicating the basic nature of the solution.
Adding phenolphthalein indicator to hydrochloric acid (HCl) will turn it red in basic solutions.
A suitable indicator for an endpoint at pH 10.5 would be methyl orange. At this pH, methyl orange changes color from red to yellow, making it a good choice for acid-base titrations that end around pH 10.5.
Adding 6 M HCl (hydrochloric acid) lowers the solution's pH, causing a shift in methyl red's equilibrium towards the red form. This is because methyl red is a pH indicator that changes color from yellow (at a higher pH) to red (at a lower pH). The addition of acid protonates the indicator, resulting in the color change.
Alkalis turn methyl orange indicator yellow because the color of methyl orange changes depending on the pH of the solution. In acidic conditions, methyl orange appears red, while in alkaline conditions it appears yellow.
Methyl Orange is red in an acidic solution.
Methyl orange is used as an indicator in the determination of ZnO because it changes color from red to yellow at a pH range of 3.1-4.4, which is suitable for the titration of ZnO with a strong acid like hydrochloric acid. This color change helps in determining the endpoint of the titration accurately.
Phenolphthalein Litmus Red Litmus Blue Universal Indicator -> Most Common Methyl Orange :)
By titration with alkaline on methyl-red indicator (pH<6)
To prepare bromocresol green indicator, dissolve 0.1 g of bromocresol green in 100 mL of ethanol. For methyl red indicator, dissolve 0.1 g of methyl red in 100 mL of ethanol. Store both indicators in a tightly sealed container away from light.