What is the litmus paper؟
إجابة الطالب المختصرة من خلال موقع بوابة الإجابات هي
Litmus paper is a type of pH indicator used to test the acidity or alkalinity of a solution. It is typically made by soaking paper in a solution of litmus, a natural dye extracted from certain lichens. Red litmus paper turns blue in the presence of a base (alkaline solution). Blue litmus paper turns red in the presence of an acid.
Litmus paper is an indicator paper used to determine whether a solution is acidic or basic (alkaline). It's one of the oldest and most basic methods for testing pH.
Here's a breakdown of what you need to know about litmus paper:
* **What it's made of:** Litmus paper is typically made of filter paper that has been treated with litmus, a natural dye extracted from lichens.
* **How it works:** The litmus dye changes color depending on the pH of the solution it comes into contact with.
* **Color changes:**
* **Acidic solutions (pH < 7):** Litmus paper turns **red**.
* **Neutral solutions (pH = 7):** Litmus paper stays its original color (either purple/blue or red, depending on the starting color of the paper).
* **Basic/alkaline solutions (pH > 7):** Litmus paper turns **blue**.
* **Types of litmus paper:**
* **Red litmus paper:** Used to test for alkalinity. If it turns blue, the solution is alkaline.
* **Blue litmus paper:** Used to test for acidity. If it turns red, the solution is acidic.
* **Limitations:** Litmus paper only indicates whether a solution is acidic or basic. It **doesn't** give you a precise pH value. For more accurate pH measurements, a pH meter or universal indicator paper (which shows a range of colors for different pH values) is needed.
In simple terms, think of it like this:
* **Red = Acid**
* **Blue = Base**
So, if you dip blue litmus paper into a solution and it turns red, you know you have an acid. If you dip red litmus paper into a solution and it turns blue, you know you have a base. If there's no color change, the solution is likely neutral.
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