What is the function of an indicator in a titration?

What is an acid-base indicator?

An acid-base indicator is a weak acid or a weak base. The undissociated form of the indicator is a different color than the iogenic form of the indicator. An Indicator does not change color from pure acid to pure alkaline at specific hydrogen ion concentration, but rather, color change occurs over a range of hydrogen ion concentrations. This range is termed the color change interval. It is expressed as a pH range.

How is an indicator used?
Weak acids are titrated in the presence of indicators which change under slightly alkaline conditions. Weak bases should be titrated in the presence of indicators which change under slightly acidic conditions.

So simply: the funciton of an indicator in a titration is to provide a visual cue to indicate the end point or change in pH in the solution.

2006-10-17 19:20:51 · answer #1 · answered by cebukitty 2 · 2⤊ 1⤋

The function of an indicator is to inform of the end point of the titration (i.e when the base or alkali has just neutralized the acid or vice versa). The indicator will turn a different colour at this point, so inform you that the titration can be stopped and no more base or acid needs to be added.

2016-03-18 03:03:26 · answer #2 · answered by Anonymous · 1⤊ 0⤋

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What is the function of an indicator in a titration?
What is the function of an indicator in a titration?

2015-08-18 19:23:25 · answer #3 · answered by ? 1 · 0⤊ 0⤋

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Phenolphthalein is a weak acid. The weak acid is colourless and its ion is bright pink. Adding extra hydrogen ions shifts the position of equilibrium to the left, and turns the indicator colourless. Adding hydroxide ions removes the hydrogen ions from the equilibrium which tips to the right to replace them - turning the indicator pink. The half-way stage happens at pH 9.3. Since a mixture of pink and colourless is simply a paler pink, this is difficult to detect with any accuracy!

2016-03-27 08:37:45 · answer #4 · answered by Anonymous · 0⤊ 0⤋

the fxn of an indicator in a titration is to let the experimentor know when enough tirant has been added that is when all the sample has completely reacted with the titrant....what happens is, after all the sample has reacted with the titrant, the extra titrant added will then react with the indicator giving a colour change in the solution....as soon as u see the colour change it means u've added enouch titrant and sholud stop.....the volume of titrant added will then b indicative of the amt of sample present in the aliquot solution being titrated..........if u r not familiar with some of the terms used ask me

2006-10-17 22:39:49 · answer #5 · answered by maria d 1 · 1⤊ 0⤋

Something the other good answers failed to mention is that many indicators exist. You can use a variety of indicators in subsequent titrations to achieve different pH levels.
Look at chemical companies and search for pH indicators. I've seen charts with about 20 different indicators that will react at different pH levels. And that's just for one company.

2006-10-17 19:25:10 · answer #6 · answered by wroockee 4 · 1⤊ 1⤋

It indicates the completion of the moiety being titrated by a change in color.

2006-10-17 19:19:04 · answer #7 · answered by Ragu 2 · 0⤊ 0⤋

What Is A Titration

2016-10-06 11:07:08 · answer #8 · answered by ? 4 · 0⤊ 0⤋

It allows the person tritrating to see when the solution is basic, acidic, and right in between.

2006-10-17 19:12:13 · answer #9 · answered by Gimmip 2 · 1⤊ 0⤋

It imparts colour to the solutions which are otherwise colourless..
In titration they hep identify the end point of reaction..

2006-10-17 19:14:38 · answer #10 · answered by Anurag 2 · 3⤊ 0⤋

What is the function of an indicator in a titration?

8 answers