Red cabbage, scientific name: Brassica oleracea var. happened f. rubra, is also known as purple cabbage. Cabbage is known by this name due to its dark red/purple leaves. It can be 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 autumn. This plant changes color based on the pH level of the soil; the plant contains a flavin pigment (anthocyanins). If the soil is acidic the leaves of the plant will be reddish; alkaline soil will make the plant's leaves a green-yellow color and neutral soil will make the plant's leaves purple. Purple cabbage juice can be used as a homemade pH indicator. Acidic solutions have more hydrogen ions (H+) so they can donate more H+ ions; while basic solutions have fewer H+ ions and accept ions, neutral solutions have an equal amount of H+ ions and HCl- ions (Hoefnagels 2012). The purple liquid indicator will change color according to the different pH levels of different acids and bases/alkaline solutions. For determining 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 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 container until it was completely covered. The boiled water and cabbage were left to sit for 10 minutes until the cabbage water turned purple. The cabbage pieces were filtered through a sieve to obtain the indicator. Eight clear glass glasses were filled with 60 ml each of red cabbage......medium of paper......cess in our life because it can be used to balance and protect our body, it is used in various foods and can be used as a cleaning material. If a baby ingests a harmful acid such as hydrochloric acid (HCl), an emergency medical number should be called immediately and the baby should be given milk if he or she has no symptoms such as vomiting or seizures. If you have no symptoms, water or milk will help bring your body's pH back to a manageable level. The color of the acidic solution became reddish-pink indicating a low pH while the color of the alkaline solution became blue-green indicating a 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.