Litmus

pH 5-8 indicator , CAS : 1393-92-6

Litmus is a commonly used pH indicator in secondary school laboratories. It is a natural dye extracted from lichens that comes in the form of blue and red litmus paper. Students can use litmus paper to visually determine whether a substance is acidic or basic. Blue litmus paper turns red in acidic solutions, while red litmus paper turns blue in basic solutions. By placing a small amount of the substance on the appropriate litmus paper, students can observe the color change and determine its pH. Litmus paper is often used in simple acid-base experiments, providing students with a basic understanding of pH and the concept of indicators in chemistry.

石蕊是中學實驗室常用的pH指示劑。 它是從地衣中提取的天然染料，以藍色和紅色石蕊試紙的形式出現。 學生可以使用石蕊試紙直觀地確定物質是酸性還是鹼性。 藍色石蕊試紙在酸性溶液中變紅色，而紅色石蕊試紙在鹼性溶液中變成藍色。 透過將少量物質放在適當的石蕊試紙上，學生可以觀察顏色變化並確定其 pH 值。 石蕊試紙常用於簡單的酸鹼實驗，讓學生對pH值和化學中指示劑的概念有基本的了解。