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Phenolphthalein is a pH indicator that changes color based on the acidity or alkalinity of a solution. In an alkaline environment (pH above 8.2), phenolphthalein turns from colorless to pink due to the deprotonation of its phenolic hydrogen, resulting in a negatively charged ion that absorbs light differently. This color change indicates the presence of a basic solution, making phenolphthalein useful for titrations and pH testing.
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Which idicator is red in acid and purple in an alkali?
The indicator that turns red in acid and purple in alkali is phenolphthalein. In acidic solutions, phenolphthalein appears colorless or red, depending on concentration, while in alkaline solutions, it turns purple. This property makes it useful for determining pH levels in various chemical applications.
Is sodium a alkali earth metals?
Sodium nitrate is not alkali. It is a neutral compound.
Are alkali and alkaline earth metals are not reactive?
No. The alkali and alkaline earth metals are very reactive.
Does alkali has a pH of over 12?
Some do. But all alkali have a pH value of more than 7.
How do you know if something is an alkali just by the name?
You can identify an alkali by its name if it contains specific terms or elements associated with alkalis. Typically, alkalis are hydroxides of alkali metals (like sodium or potassium) or alkaline earth metals (like calcium). If the name includes "hydroxide," such as sodium hydroxide (NaOH) or potassium hydroxide (KOH), it indicates an alkali. Additionally, the presence of alkali metal names in the formula or common names suggests it is an alkali, such as sodium or potassium compounds.
Which Colour do alkali turn phenolphthalein?
Alkalis turn phenolphthalein pink or magenta.
What colour does phenolphthalen go when an alkali is added?
Phenolphthalein turns pink/magenta in the presence of an alkali.
What would you mix an alkali or acid with to get a coloured substaince?
You could mix an acid or alkali with an indicator such as methyl orange or phenolphthalein. Phenolphthalein is colorless in an acidic medium and pink in an alkaline one.
What makes phenolphthalein turn alkali pink?
Phenolphthalein turns pink in the presence of a base or any solution with a ph over 7.
What chemical reaction between the phenolphthalein and NaOH?
Phenolphthalein reacts with NaOH in a neutralization reaction, where the acidic H+ ions in phenolphthalein are replaced by the basic OH- ions from NaOH. This reaction leads to the formation of a pink color indicating the basic nature of the solution.
How does the color change when a strong acid is added an alkali to neutralise?
The color does not change unless an indicator such as litmus or phenolphthalein is being used. If litmus the color change is blue to red If phenolphthalein the change is red to colorless
Which idicator is red in acid and purple in an alkali?
The indicator that turns red in acid and purple in alkali is phenolphthalein. In acidic solutions, phenolphthalein appears colorless or red, depending on concentration, while in alkaline solutions, it turns purple. This property makes it useful for determining pH levels in various chemical applications.
Will acids turn phenolphthalene indicator pink?
No, phenolphthalein turns colourless when it comes into contact with an acid. It only turns magenta with a base (alkali)
What green liquid is used to determine if a chemical is a acid or alkali?
A green liquid called phenolphthalein is commonly used to determine if a chemical is an acid or alkali. Typically, it turns pink in the presence of a base (alkali) and remains colorless in the presence of an acid.
How acid and alkali can be differentiated by using phenolphthaleine?
Phenolphtahlein in acid should be colorless, and in base it should be pink.
What happens when ammonia gas is passed through water containing phenolphthalein?
Ammonia gas get dissolved in water which form ammonium hydroxide. NH4OH is alkaline in nature. so when phenolphthalein is added to it. It produce PINK colouration.
Why does Phenolphthalein turn pink in potassium hydroxide solution?
Oh, dude, it's like this chemical reaction party where Phenolphthalein gets all excited and turns pink when it hangs out with potassium hydroxide. It's because the potassium hydroxide is a strong base that steals hydrogen ions from the Phenolphthalein, making it change color. So yeah, it's just chemistry being all colorful and stuff.
