Why you use methyl orange during estimation of bicarbonate ion from irrigation water insted of phenolphthalein?

1. Why do we use methyl orange indicator in finding the alkalinity of water?
2. Why both phenolphthalein and methyl orange are used as indicators?
3. What is the use of phenolphthalein indicator in alkalinity of water?
4. Why do we use two indicators in carbonate and bicarbonate ions determination?
5. What ions give methyl orange alkalinity?
6. Why is Methyl Red used and not methyl orange is used as the indicator?
7. Why is phenolphthalein used as an indicator?
8. What is the difference between phenolphthalein indicator and methyl orange indicator?
9. What is methyl orange indicator?
10. What is the difference between phenolphthalein alkalinity and total alkalinity?
11. Which ions are responsible for alkalinity of water?
12. Why can Hydrocaride ions and bicarbonate ions not be mixed?
13. What are the Colours of methyl orange in alkaline and acidic media?
14. What do bicarbonate ions do?

Why do we use methyl orange indicator in finding the alkalinity of water?

A measure of the total amount of hydroxyl ions in a solution as determined by titration with standardized acid and methyl orange indicator. The alkalinity test is a well-known water-analysis procedure to estimate hydroxyl ion, carbonate ion and bicarbonate ion concentrations.

Why both phenolphthalein and methyl orange are used as indicators?

In the case of acid base reaction, chemical indicators like methyl orange or phenolphthalein are used to determine end point. These indicators changes color with the change in the pH of the solution. ... Reactant/ analyte : It is the solution whose concentration is not known.

What is the use of phenolphthalein indicator in alkalinity of water?

Alkalinity is measured titrimetrically by titrating against Dilute Sulphuric Acid. Phenolphthalein and Methyl Orange are used as indicator to indicate pH 8.3 and pH 4.3. Phenolphthalein process a pink colour when pH is above 8.3 and colourless when pH is below 8.3.

Why do we use two indicators in carbonate and bicarbonate ions determination?

Water Alkalinity is mainly due to carbonate and bicarbonate salts in a water sample, the carbonate ion has two end points, one from carbonate to bicarbonate and another from bicarbonate to carbon dioxide. Methyl orange end point yellow to red.

What ions give methyl orange alkalinity?

This can only happen when both OH– and CO32– ions are not present in water. Alkalinity is present due to HCO3– ion only which can be determined using methyl orange indicator and called methyl orange alkalinity (M). 2. P = ½ M; indicates that only CO32– ions are present.

Why is Methyl Red used and not methyl orange is used as the indicator?

Soc., 1910, 97, 2477) concluded that g L as an indicator methyl red is greatly superior to methyl orange, as the colour curves show. ... It is quite true that the end-point with methyl red is sharper than with methyl orange when these indicators are simply tested in water with acid or alkali.

Why is phenolphthalein used as an indicator?

A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.

What is the difference between phenolphthalein indicator and methyl orange indicator?

Methyl orange indicator gives red colour in acid while phenolphthalein is colorless in acid solution. Methyl orange gives yellow in basic while phenolphthalein gives pink colour in basic solution..

What is methyl orange indicator?

Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values. Methyl orange shows red color in acidic medium and yellow color in basic medium.

What is the difference between phenolphthalein alkalinity and total alkalinity?

Phenolphthalein alkalinity measures the hydroxides and half the carbonates at a pH 8.3. Total alkalinity measures all carbonate, bicarbonate, and hydroxide alkalinity at a pH 4.5 (approximately).

Which ions are responsible for alkalinity of water?

Hydroxide (OH ^-) ions, bicarbonate (HCO ₃ ^-) ions, and carbonate (CO ₃ ^2-) ions all contribute to water alkalinity.

Why can Hydrocaride ions and bicarbonate ions not be mixed?

[H+] corresponds to standard HCl whilst hydroxide, carbonate and bicarbonate are the alkalinity causing ions present in water. ... Thus OH-and HCO3- ions cannot exist together in water and hence can be concluded that all the three OH- , HCO3- ,CO32 ions cannot exist together [7,8].

What are the Colours of methyl orange in alkaline and acidic media?

- Methyl orange shows a yellow color when it is mixed with an alkaline solution (a solution that is a mixture of base solids mixed with water, i.e. a basic solution) and shows a red color in an acidic solution. Hence, option A is the correct option.

What do bicarbonate ions do?

It raises the internal pH of the stomach, after highly acidic digestive juices have finished in their digestion of food. Bicarbonate also acts to regulate pH in the small intestine.