In this course, we will explore the fascinating world of indicators and learn about their behavior in acidic and basic solutions. Indicators are substances that undergo color changes when exposed to different pH levels. Understanding their properties is crucial in many scientific fields, including chemistry and biology.
Definitions
Definition
Indicators are substances that can be used to determine the pH of a solution. They undergo color changes based on the concentration of hydrogen ions (H+) or hydroxide ions (OH-) present in the solution.
Indicators can be natural or synthetic compounds. Some common natural indicators include litmus, red cabbage extract, and turmeric. Synthetic indicators such as phenolphthalein and bromothymol blue are also widely used.
Definitions
pH Scale
The pH scale is a numerical scale used to specify the acidity or basicity of a solution. It ranges from 0 to 14, with 0 being the most acidic, 7 being neutral, and 14 being the most basic (alkaline).
Acidic solutions have pH values less than 7. They contain a higher concentration of hydrogen ions (H+) compared to hydroxide ions (OH-). Common examples of acidic substances include lemon juice, vinegar, and stomach acid.
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Definition
Acidic indicators are substances that change color in acidic solutions. They exhibit different colors depending on the pH of the solution.
Some common acidic indicators include litmus, phenolphthalein, and methyl orange. Litmus turns red in acidic solutions and blue in basic solutions. Phenolphthalein is colorless in acidic solutions but turns pink or red in basic solutions. Methyl orange changes from red to yellow in the transition from acidic to basic pH.
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Definition
Basic solutions have pH values greater than 7. They contain a higher concentration of hydroxide ions (OH-) compared to hydrogen ions (H+). These solutions are also known as alkaline solutions.
Some examples of basic substances include soapy water, baking soda solution, and bleach. Basic solutions have a bitter taste and feel slippery.
Definitions
Definition
Basic indicators are substances that change color in basic solutions. They exhibit different colors depending on the pH of the solution.
Common basic indicators include phenolphthalein and bromothymol blue. Phenolphthalein is colorless in acidic solutions but turns pink or red in basic solutions. Bromothymol blue changes from yellow to blue as the pH increases from acidic to basic.
To remember :
In this course, we learned about indicators and their behavior in acidic and basic media. Indicators are substances that undergo color changes based on the pH of a solution. Acidic indicators change color in acidic solutions, while basic indicators change color in basic solutions. Understanding the behavior of indicators is essential in determining the acidity or basicity of a solution, which has applications in various scientific fields.
