What is the pH value of phenolphthalein?
Table of Contents
What is the pH value of phenolphthalein?
8.2 – 10.0
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 |
At what pH does phenolphthalein can change its color?
8.2
Phenolphthalein is naturally colorless but turns pink in alkaline solutions. The compound remains colorless throughout the range of acidic pH levels but begins to turn pink at a pH level of 8.2 and continues to a bright magenta at pH 10 and above.
What will be the colour of phenolphthalein at pH 8?
Phenolphthalein is naturally colourless but turns pink in alkaline solutions. In acidic pH levels the indicator remains colourless throughout and when it comes to a pH level of 8.2 it begins to turn pink.
What colour does phenolphthalein turn in neutral?
Colourless
Other indicators
| Indicator | Acidic | Neutral |
|---|---|---|
| Methyl orange | Red | Yellow |
| Phenolphthalein | Colourless | Colourless |
What is the difference between phenolphthalein and methyl orange?
Methyl orange indicator gives red colour in acid while phenolphthalein is colorless in acid solution. Methyl orange gives yellow in basic while phenolphthalein gives pink colour in basic solution..
Does phenolphthalein affect pH?
Phenolphtalein is slightly acidic. It does affect titration because if you add too much, then it will alter the concentration of whichever solution you are adding it in. If you added it to the acid, it will cause that acid to be more acidic than you may have calculated.
What is the indicator of pH 7?
Neutral Green
Universal indicator
| pH range | Description | Colour |
|---|---|---|
| 3–6 | Weak acid | Orange or Yellow |
| 7 | Neutral | Green |
| 8–11 | Weak alkali | Blue |
| > 11 | Strong alkali | Indigo or Violet |
Which indicator should be used for a pH change from 7 to 8?
The litmus colour change happens over an unusually wide range, but it is useful for detecting acids and alkalis in the lab because it changes colour around pH 7….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 color of this indicator in a solution with pH 8?
Universal indicator
| pH range | Description | Colour |
|---|---|---|
| 3–6 | Weak acid | Orange or Yellow |
| 7 | Neutral | Green |
| 8–11 | Weak alkali | Blue |
| > 11 | Strong alkali | Indigo or Violet |
Which pH is considered neutral?
7
The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
