Red cabbage, scientific name: Brassica oleracea var. inhabitant f. rubra, is also known as purple cabbage. Cabbage is known by this name because of its dark red/purple leaves. It is found in China, Northern Europe and throughout America. Red cabbage needs sufficient moisture and fertilized soil to grow. Red cabbages are planted in spring and harvested in fall. This plant changes color depending on the pH of the soil; the plant contains a flavin pigment (anthocyanins). If the soil is acidic, plant leaves will be reddish; alkaline soil will turn the plant's leaves a green-yellow color, and neutral soil will turn the plant's leaves purple. The juice of purple cabbage can be used as a homemade pH indicator. Acidic solutions contain more hydrogen ions (H+), so they can give more H+ ions; while basic solutions contain fewer H+ ions and accept ions, neutral solutions contain an equal amount of H+ ions and HCl- ions (Hoefnagels 2012). The purple liquid indicator will change color depending on the different pH levels of different acids and bases/alkaline solutions. To determine the pH levels in acids and bases of household solutions/powders. Three cups of cabbage were cut into small pieces using a knife. Once the cabbage was chopped, it was then placed in a large clear glass dish. Tap water was boiled in a kettle; once boiled, the water was then poured over the cabbage in the glass dish until all the cabbage was covered. The boiled water and cabbage were left to sit for 10 minutes until the cabbage water turned purple. The pieces of cabbage were drained using a strainer to obtain the indicator. Eight transparent glass goblets were filled with 60ml each of red cabbage...... middle of paper ......essential in our life as it can be used to balance and protect our body, it is used in various foods and it can be used as a cleaning material. If a child swallows a harmful acid such as hydrochloric acid (HCl), an emergency medical number should be called immediately and the child should be given milk if no symptoms such as vomiting or seizures are present. presented. If no symptoms appear, water or milk will help bring the body's pH to a manageable level. The color of the acidic solution turned reddish pink, indicating low pH, while the color of the alkaline solution turned blue-green, indicating low pH. high pH, ​​the color of the solution with the addition of water remained the same, and therefore the hypothesis is supported. The experiment can be improved by using pH strips to obtain the actual pH value, thus allowing the experiment to be more accurate..