Often asked: Why Can’t You Use Phenolphthalein Indicator For Titration Of Dark Brown Balsamic Vinegar?

Why is it important that you add phenolphthalein indicator solution to the vinegar?

The acetic acid content of a vinegar may be determined by titrating a vinegar sample with a solution of sodium hydroxide of known molar concentration (molarity). Phenolphthalein will be used as an indicator because it will be colorless before the completion of this reaction but pink after the completion.

Why might titration be difficult with brown vinegar?

It is also possible to determine concentration of acetic acid in other types of vinegar. The only problem is that the color of the vinegar can make it difficult to spot the end point.

When the indicator phenolphthalein is used in a titration the color of the solution at the end point will be?

An acid-base indicator can be used to help identify when the change from acidic to basic occurs. Phenolphthalein is colorless in acidic solutions and bright purple in basic solutions. As such, it should change from colorless to purple around the equivalence point of this titration.

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Why would phenolphthalein not be a suitable indicator?

Phenolphthalein indicator distinguishes the pH change between pH 8 to 10. In the given options, HCl and NH4​OH is a strong acid and weak base titration where phenolphthalein is useless as an indicator.

Does vinegar neutralize sodium hydroxide?

Never, never, NEVER use vinegar on a lye splash anywhere on your body. Rinse with plenty of plain cool running water. Vinegar, an acid, does indeed neutralize NaOH or KOH, both bases, but there are serious downsides to doing this kind of chemistry directly on the body.

What happens when you mix acetic acid with phenolphthalein?

Phenolphthalein is colorless in acidic solution, but changes to pink when the solution becomes basic. So when enough sodium hydroxide has been added to the acetic acid, such that there is no longer any unreacted acetic acid, the sodium hydroxide will then begin reacting with phenolphthalein.

Does vinegar lose acidity?

Vinegar usually does not expire and can last indefinitely. However, if not stored properly, vinegar will decline in quality and lose its acidity and flavor. In many home kitchens, vinegar is one of the most useful condiment.

How do you determine the acidity of vinegar?

To measure the pH of vinegar, simply use a pH strip. The resulting color will tell you how strong the vinegar is. Distilled white vinegar usually measures around pH 2.4, with a strength of 5%. The lower the pH, the more acid the vinegar is.

What does 5 acidity mean in vinegar?

Percent acid is defined as the number of grams of acetic acid per 100 mL of vinegar. So the 5 % vinegar you buy in the store has 5 g of acetic acid per 100 mL (or 50g per L). Vinegar makers occasionally use the term ‘grain’ which is just the acidity multiplied by 10 so 5 % acidity is 50 grain.

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What color is phenolphthalein in a basic solution?

Phenolphthalein is often used as an indicator in acid – base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

What Colour is phenolphthalein indicator in a neutral solution?

Other indicators

Indicator Acidic Neutral
Methyl orange Red Yellow
Phenolphthalein Colourless Colourless

Why is phenolphthalein pink in basic solution?

We will first try to understand what exactly is phenolphthalein and its use. – Phenolphthalein is widely used as an indicator in acid- base titrations. -It turns colourless in presence of an acid and turns pink in presence of a base. It is due to the formation of ions that the solution turns pink.

What color is phenolphthalein at the equivalence point?

Initially there is a large excess of acid, the solution is acidic, and the phenolphthalein indicator is colourless. BUT phenolphthalein changes colour between pH 8.3 and 10.0, so, at the equivalence point the phenolphthalein remains colourless.

Can you use phenolphthalein indicator?

If you use phenolphthalein, you would titrate until it just becomes colourless (at pH 8.3) because that is as close as you can get to the equivalence point. On the other hand, using methyl orange, you would titrate until there is the very first trace of orange in the solution.

indicator pKind
phenolphthalein 9.3

What is phenolphthalein an indicator for?

Phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.

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