0
Phenolphthalein is typically used first in acid-base titrations because it has a clear color change from colorless to pink around a pH of 8.2 to 10, making it ideal for detecting the endpoint of strong acid versus strong base titrations. Methyl orange, on the other hand, changes color from red to yellow between pH 3.1 and 4.4, which is better suited for strong acid versus weak base titrations. Using phenolphthalein first allows for a more precise determination of the endpoint in higher pH ranges before transitioning to methyl orange for lower pH applications.
What else can I help you with?
Why methyl orange alkalinity equal to total alkalinity?
Alkalinity is different from basicity, which is directly related to the pH. The higher the pH, the more basic the water.Like acidity, there are different ways to measure and report alkalinity;The first is to titrate the water with acid titrant to the phenolphthalein end point. This is called the phenolphthalein alkalinity. Since phenolphthalein changes color at pH~8.3, this corresponds to a pH where all the CO32- present would be protonated.Second, acid titration to a methyl orange end point, pH~4.3, further converts the bicarbonate to aqueous carbon dioxide. At this end point, some of the weaker conjugate bases are protonated. The methyl orange end point titration indicates total alkalinity.
How do you do neutralization (for chloride determination of cosmetics) In the method we have to neutralize the solution with diluted Nitric acid withe Methyl orange?
To perform neutralization for chloride determination in cosmetics, first dissolve the sample in distilled water. Then, add a few drops of methyl orange indicator to the solution, which will turn red in acidic conditions. Slowly titrate the solution with diluted nitric acid until the color changes from red to yellow, indicating that the solution is neutralized. The volume of nitric acid used can then be used to calculate the chloride concentration in the sample.
What component of screened methyl is separated first and why?
In the process of screening methyl, the first component typically separated is the more volatile fraction. This occurs because the more volatile compounds have lower boiling points and vaporize at lower temperatures, allowing them to be separated first during distillation or similar techniques. This separation is essential for isolating specific methyl derivatives or refining products with desired properties.
How can we convert methane into methyl iodide?
Methane can be converted into methyl iodide through a two-step process involving halogenation. First, methane is reacted with iodine in the presence of ultraviolet light or heat to form iodomethane (methyl iodide) and hydrogen iodide. This reaction proceeds through a radical mechanism, where the methane is first converted into a methyl radical, which subsequently reacts with iodine. The overall reaction is typically represented as CH₄ + I₂ → CH₃I + HI.
Why is there a need to use two indicators in titrating a carbonate mixture?
One single probe may contain two bases: Either OH- and CO32-, or CO32- and HCO3- . (All three of them is non-coexsistant, hence it is impossible)Titration with strong acid will reach the first equivalence point at pH = 8 (phenolphtaleine change to colorless) when both, or one, of these completed reactions: OH- + H+ --> H2O (if OH- is present) andCO32- + H+ --> HCO3-Further titration with strong acid, after addition of methyl orange indicator will reach the second equivalence point at pH = 4 (methyl orange changes from orange-yellow to red) when this reaction is completed : HCO3- + H+ --> H2CO3From the difference and total of these two titrtions (done with the same probe in two steps) both compounds can be determined.
Can you use methyl orange and phenolphthalein fro weak acid weak base titrations?
first of all remember that titr'n b/w weak acid and weak base is impossible. weak acid*strong base-phenolphthalein str acid*weak base-methyl orange if both are strong can use both.
What is the chemical formula for methyl orange?
Methyl orange is synthesized by reaction of sulfanilic acid, sodium nitrite, and dimethylaniline. First, sulfanilic acid is dissolved in dilute aqueous acid. Sodium nitrite is added to produce a disowning salt .Chemical formula of Methyl Orange: C14H14N3NaO3S
How does column chromatography separate a mixture of methylene blue and methyl orange?
Methylene blue and methyl orange will have different binding affinities with the column material, and thus one will pass through the column more slowly than the other. This will result in one of the compounds being eluted from he column before the other. The one with the weakest binding to the column will be eluted first.
Why methyl orange alkalinity equal to total alkalinity?
Alkalinity is different from basicity, which is directly related to the pH. The higher the pH, the more basic the water.Like acidity, there are different ways to measure and report alkalinity;The first is to titrate the water with acid titrant to the phenolphthalein end point. This is called the phenolphthalein alkalinity. Since phenolphthalein changes color at pH~8.3, this corresponds to a pH where all the CO32- present would be protonated.Second, acid titration to a methyl orange end point, pH~4.3, further converts the bicarbonate to aqueous carbon dioxide. At this end point, some of the weaker conjugate bases are protonated. The methyl orange end point titration indicates total alkalinity.
How do you do neutralization (for chloride determination of cosmetics) In the method we have to neutralize the solution with diluted Nitric acid withe Methyl orange?
To perform neutralization for chloride determination in cosmetics, first dissolve the sample in distilled water. Then, add a few drops of methyl orange indicator to the solution, which will turn red in acidic conditions. Slowly titrate the solution with diluted nitric acid until the color changes from red to yellow, indicating that the solution is neutralized. The volume of nitric acid used can then be used to calculate the chloride concentration in the sample.
What component of screened methyl is separated first and why?
In the process of screening methyl, the first component typically separated is the more volatile fraction. This occurs because the more volatile compounds have lower boiling points and vaporize at lower temperatures, allowing them to be separated first during distillation or similar techniques. This separation is essential for isolating specific methyl derivatives or refining products with desired properties.
How can we convert methane into methyl iodide?
Methane can be converted into methyl iodide through a two-step process involving halogenation. First, methane is reacted with iodine in the presence of ultraviolet light or heat to form iodomethane (methyl iodide) and hydrogen iodide. This reaction proceeds through a radical mechanism, where the methane is first converted into a methyl radical, which subsequently reacts with iodine. The overall reaction is typically represented as CH₄ + I₂ → CH₃I + HI.
Who was the first orange president?
Donald trump was the first orange president
Why is there a need to use two indicators in titrating a carbonate mixture?
One single probe may contain two bases: Either OH- and CO32-, or CO32- and HCO3- . (All three of them is non-coexsistant, hence it is impossible)Titration with strong acid will reach the first equivalence point at pH = 8 (phenolphtaleine change to colorless) when both, or one, of these completed reactions: OH- + H+ --> H2O (if OH- is present) andCO32- + H+ --> HCO3-Further titration with strong acid, after addition of methyl orange indicator will reach the second equivalence point at pH = 4 (methyl orange changes from orange-yellow to red) when this reaction is completed : HCO3- + H+ --> H2CO3From the difference and total of these two titrtions (done with the same probe in two steps) both compounds can be determined.
How do you separate iodine and methyl alcohol?
Iodine and methyl alcohol can be separated by fractional distillation, as they have different boiling points. Methyl alcohol has a lower boiling point than iodine, so it will vaporize first and can be collected separately.
How do you prepare methyl red for titration?
To prepare methyl red for titration, first make a stock solution by dissolving the dye in a suitable solvent such as water or alcohol. Then, carefully add the desired amount of the stock solution to your titration flask based on the concentration needed for your specific experiment. Finally, ensure proper mixing before using the solution for titration.
Why methyl group cannot be present at first carbon of the chain?
A methyl group, which consists of a carbon atom bonded to three hydrogen atoms, is unable to be present at the first carbon of a chain due to the principle of tetravalency in carbon chemistry. The first carbon must form four single covalent bonds to satisfy its tetravalency, thus it cannot accommodate an additional methyl group. This would violate the octet rule, which states that elements tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.
