Table of Contents
- 1 What is pH range of phenolphthalein and methyl orange?
- 2 What is the pH range when adding phenolphthalein?
- 3 What is phenolphthalein made up of?
- 4 What type of indicator is phenolphthalein?
- 5 What color is BCG?
- 6 Why is phenolphthalein a good indicator?
- 7 What number range is there for pH?
- 8 What range of pH is considered an acid?
What is pH range of phenolphthalein and methyl orange?
If you use phenolphthalein or methyl orange, both will give a valid titration result – but the value with phenolphthalein will be exactly half the methyl orange one….The pH range of indicators.
| indicator | pKind | pH range |
|---|---|---|
| litmus | 6.5 | 5 – 8 |
| methyl orange | 3.7 | 3.1 – 4.4 |
| phenolphthalein | 9.3 | 8.3 – 10.0 |
What is the pH range when adding phenolphthalein?
| Indicator | pH Range | Alkali |
|---|---|---|
| 28 Phenol red | 6.4-8.4 | red |
| 27 Phenolphthalein | 8.2-10 | red |
| 34 Thymol blue (1st range) | 1.2-2.8 | yellow |
| 34.1 Thymol blue (2nd range) | 8.0-9.6 | blue |
What is the range of an indicator?
pH Ranges of pH Indicators pH indicators are specific to the range of pH values one wishes to observe. For example, common indicators such as phenolphthalein, methyl red, and bromothymol blue are used to indicate pH ranges of about 8 to 10, 4.5 to 6, and 6 to 7.5 accordingly.
What is the concentration of phenolphthalein indicator?
The concentration of Phenolphthalein Indicator Solution 16232 is 5g/L or 0.5\%.
What is phenolphthalein made up of?
Phenolphthalein can be synthesized by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions. It was discovered in 1871 by Adolf von Baeyer.
What type of indicator is phenolphthalein?
acid-base indicator
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.
Why is phenolphthalein used?
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. Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments.
What is phenolphthalein class 7th?
(c) Phenolphthalein: Phenolphthalein is an indicator solution which turns colourless in the presence of acids. Therefore, in the presence of sulphuric acid, phenolphthalein turns colourless.
What color is BCG?
Bromocresol green
Bromocresol green (BCG) is a dye of the triphenylmethane family (triarylmethane dyes)….Bromocresol green.
| Names | |
|---|---|
| 3D model (JSmol) | Interactive image |
| Abbreviations | BCG |
| ChEMBL | ChEMBL145704 |
| ChemSpider | 6209 |
Why is phenolphthalein a good indicator?
Phenolphthalein changes colour at a pH above 7. So it is quite good as an indicator for titrations of strong acids with strong bases. It is also suitable for titrations of weak acids and strong bases, which have an equivalence point at a pH above 7.
What is phenolphthalein an indicator for?
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. It is a weak acid, which can lose H+ ions in solution.
Does the amount of phenolphthalein matter?
How much phenolphthalein was used? The intensity of the color is concentration dependent, so if a large amount of phenolphthalein is present the color could be very strong at the end-point. However, the presence of a large amount of phenolphthalein is not usually the reason a titration mixture has an intense color.
What number range is there for pH?
The pH scale ranges from 0 to 14: Acidic water has a pH lower than 7. The most acidic substances have a pH of 0. Battery acid falls into this category. Alkaline water has a pH of 8 or above. The most alkaline substances, such as lye, have a pH of 14. Pure water has a pH of 7 and is considered “neutral” because it has neither acidic nor basic qualities.
What range of pH is considered an acid?
The range of pH is commonly considered to extend from 0 to 14. A pH value of 7.0 is neutral, because pure water has a pH value of exactly 7.0. Values less than 7.0 are considered acidic, while those greater than 7.0 are considered basic or alkaline.
Which pH range is basic?
The pH scale covers a range between 0 and 14 pH. A pH of exactly 7 is neutral. pH values greater than 7 are basic, while pH values less than 7 are acidic.