Press "Enter" to skip to content

Is phenolphthalein a good indicator for titration?

For a strong acid-strong base titration, the equivalence point is at pH 7. The pH range of phenolphthalein is about 8.3 to 10.0, but the titration curve is so steep at the equivalence point that phenolphthalein makes a good indicator. Phenolphthalein is great for this titration.

Which type of indicator is phenolphthalein?

acid-base indicator

What is the range of phenolphthalein?

Indicator Range

Indicator Colour pH range
Bromothymol Blue yellow 6.0 – 7.6
Phenol Red yellow 6.8 – 8.4
Thymol Blue – 2nd change yellow 8.0 – 9.6
Phenolphthalein colourless 8.2 – 10.0

What are the limits of the universal indicator?

Universal Indicator It covers a pH range from less than 3 (red) to greater than 11 (violet). Intermediate colors include orange/yellow (pH 3 to 6), green (pH 7 or neutral), and blue (pH 8 to 11).

What is the most common indicator?

litmus paper

What is the purpose of an indicator?

An indicator shows when something happens or when it will happen. It also helps tell what will happen in a reaction.

What is the purpose of an indicator in a titration experiment?

Indicator: It is a chemical reagent used to recognize the attainment of end point in a titration. After the reaction between the substance and the standard solution is complete, the indicator should give a clear colour change. When a titration is carried out, the free energy change for the reaction is always negative.

What indicator is used in this experiment?

phenolphthalein indicator

What is the purpose of using an indicator during a titration?

In a titration, you determine an unknown concentration of a sample by adding a second reactant of known concentration. In many titrations, you use a chemical called an indicator, which lets you know when the titration finishes.

What are indicators in simple words?

Indicators are substances whose solutions change color due to changes in pH. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra.

What is the best definition for an indicator?

1 : one that indicates: such as. a : an index hand (as on a dial) : pointer. b(1) : gauge sense 2b, dial sense 4a. (2) : an instrument for automatically making a diagram that indicates the pressure in and volume of the working fluid of an engine throughout the cycle.

What is an indicator name three common indicators?

(a) An indicator is a ‘dye’ that changes colour when it is put in an acid or a base. The three most common indicators are: Litmus, Methyl orange and Phenolphthalein.

What is an indicator Name any two?

Indicator is any substance that gives a visible sign, usually by a colour change, of the presence or absence of a these hold concentration of a chemical species, such as an acid or an alkali in a solution. Two indicators are litmus and turmeric.

How do you make an indicator?

Making your indicator: Boil the kettle and pour the hot water in the bowl until it just covers the cabbage. Stir a little bit and then leave for five to ten minutes. The colouring you can see in the water is your indicator! Place the strainer over the second large bowl and pour off the liquid.