Basically, hydroxonium ions and hydroxil ions are responsible for the acidic/basic property. Due to processes such as hydrolysis, other ions might too interfere.
The gas that turns a universal indicator blue is usually chlorine.
Phenol red changes yellow in acidic conditions due to a shift in its chemical structure, which occurs when the hydrogen ions in the solution cause the indicator to undergo a color change. This change is reversible when the solution becomes basic again.
Indicator ion exchange resins are made by incorporating specific indicator dyes into the ion exchange resin matrix during the manufacturing process. These indicator dyes change color in the presence of certain ions, allowing for easy visual identification of their presence or absence in a solution. The choice of indicator dye will depend on the specific ions to be detected.
Ferroin indicator is used in the redox titration of Mohr's salt as it changes color when the Fe2+ ions are completely oxidized to Fe3+ ions. This color change helps in determining the end point of the titration, where all the Mohr's salt has been oxidized and no more Fe2+ ions are present.
Potassium chromate is used as an indicator in argentometric titrations because it forms a red precipitate (silver chromate) in the presence of excess silver ions. This color change signals the end point of the titration, where all the chloride ions have reacted with silver ions. This makes it easy to visually detect when the reaction is complete.
The gas that turns a universal indicator blue is usually chlorine.
Phenol red changes yellow in acidic conditions due to a shift in its chemical structure, which occurs when the hydrogen ions in the solution cause the indicator to undergo a color change. This change is reversible when the solution becomes basic again.
The indicator's reaction in acids and bases is a chemical change because it involves a change in the chemical structure of the indicator molecule due to its interaction with the ions present in the acid or base solution. This results in a change in color, which is a visible manifestation of the chemical reaction taking place.
In an EDTA titration using Eriochrome Black T indicator, the pink color indicates the presence of free metal ions, such as calcium or magnesium, which form complexes with the indicator. As EDTA is added, it binds to these metal ions more strongly than the indicator does, causing the indicator to release the metal and change color. At the endpoint, when all the metal ions have reacted with EDTA, the indicator turns blue due to its transition to a form that is free of metal ions, indicating that the titration is complete.
Indicator ion exchange resins are made by incorporating specific indicator dyes into the ion exchange resin matrix during the manufacturing process. These indicator dyes change color in the presence of certain ions, allowing for easy visual identification of their presence or absence in a solution. The choice of indicator dye will depend on the specific ions to be detected.
Ferroin indicator is used in the redox titration of Mohr's salt as it changes color when the Fe2+ ions are completely oxidized to Fe3+ ions. This color change helps in determining the end point of the titration, where all the Mohr's salt has been oxidized and no more Fe2+ ions are present.
When universal indicator is added to a solution containing iron ions (such as iron(II) or iron(III) ions), it typically shows a color change depending on the pH of the solution. In acidic conditions, iron(II) ions may produce a light green color, while iron(III) ions can give a yellow to brown color. If the solution is neutral or basic, the indicator may show green to blue hues. The specific color observed will depend on the concentration of the iron ions and the pH of the solution.
Potassium chromate is used as an indicator in argentometric titrations because it forms a red precipitate (silver chromate) in the presence of excess silver ions. This color change signals the end point of the titration, where all the chloride ions have reacted with silver ions. This makes it easy to visually detect when the reaction is complete.
Metallochromic indicators are chemical compounds that change color when they bind to metal ions. They are commonly used in analytical chemistry to detect the presence of metal ions in a solution. The color change is due to the formation of a complex between the indicator and the metal ion.
The phenolphthalein indicator is pink in basic solutions.
The pH number of an indicator, such as litmus paper or phenolphthalein, changes depending on the concentration of hydrogen ions in a solution. The indicator will change color at a specific pH range, indicating whether the solution is acidic, neutral, or basic. Different indicators have different pH ranges at which they change color.
When an indicator is added to an acid or base, it undergoes a chemical reaction with the hydrogen or hydroxide ions present in the solution. This reaction causes a change in the color of the indicator, indicating a shift in the pH of the solution. Since a new substance with different properties is formed during this reaction, it is considered a chemical change.