Phenolphthalein Indicator - Science Notes and Projects
2022年1月19日 · Here is a look at the colors at different pH ranges, the chemistry of the color change, how to make phenolphthalein indicator, and uses of the chemical. The two main colors of phenolphthalein are colorless and fuchsia, which is a pink-purple-red color, depending on the indicator concentration.
Phenolphthalein - Wikipedia
In strongly basic solutions, phenolphthalein is converted to its In(OH) 3− form, and its pink color undergoes a rather slow fading reaction [6] and becomes completely colorless when pH is greater than 13.
Phenolphthalein Magic: The Color-Changing Secret
2024年1月13日 · Phenolphthalein is a pH indicator that changes color based on the acidity or alkalinity of a solution. Its structure consists of three aromatic rings connected by two carbon atoms. In an acidic solution, phenolphthalein remains colorless, but …
pH Indicator Chart – Colors and Ranges - Science Notes and …
2020年9月10日 · If you use phenolphthalein, you expect a pink/red color to vanish below a pH value of 8.0. You titrate until the solution becomes colorless because that is as close to the equivalence point as you can get. If you use methyl orange, you expect the color to change from yellow to orange somewhere below a pH of 6 and from orange to red around a pH ...
Phenolphthalein - Structure and Why Does it Change Color?
Phenolphthalein is naturally colourless and works differently then litmus paper. Also, it turns in pink colour in an alkaline solution or base. Moreover, the compound remains colourless in acids but starts to turn pink on pH 8.2 and continues to turn bright purple in strong bases. Colour Change of Phenolphthalein
17.3: Acid-Base Indicators - Chemistry LibreTexts
2023年7月12日 · Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × …
Phenolphthalein - Chemistry Online
2024年4月22日 · Phenolphthalein (molecular formula C 20 H 14 O 4) is a pH indicator. In acidic solutions it remains colorless, but in the presence of basic solutions it takes on a pinkish color with a turning point between pH = 8.0 (colorless) to pH = 9.8 (magenta or pinkish). Its IUPAC name is 3,3-bis (4-hydroxyphenyl)-2-benzofuran-1- (3 H)-one.
14.9: Indicators - Chemistry LibreTexts
2023年7月18日 · A typical indicator for acid-base titrations is phenolphthalein, HC 20 H 13 O 4. Phenolphthalein, whose structure is shown below, is a colorless weak acid (K a = 3 × 10 –10 mol/L). Its conjugate base, C 20 H 13 O 4 – has a strong pinkish-red color.
Phenolphthalein | pH indicator, acid-base titration, indicator dye ...
2024年11月7日 · 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. Phenolphthalein is a potent laxative, which acts within 6–8 hours; its effects may last 3–4 days. Such adverse reactions as kidney irritation or skin rash may occur.
Phenolphthalein - Molecule of the Month - March 2022 (HTML …
Why does it change colour? Under acidic conditions the phph molecule becomes protonated, while under basic conditions it becomes deprotonated. These changes affect the electronic structure of the molecule and hence the wavelength of light it absorbs.