There are many wonderful natural acid-base indicators. One such omnipresent food item in Indian households is turmeric powder (Haldi). The dazzling yellow of turmeric turns a deep red when exposed to a basic/alkaline substance. However, it remains yellow if the test sample is neutral or acidic. The deep red powder created by exposing turmeric to a basic substance is nothing but vermilion (Kumkum), which is now your natural acid indicator. This new formed Vermilion turns back to yellow (turmeric) when exposed to an acidic solution, but will remain a deep red when exposed to a basic or neutral substance. Enjoy testing various household items, edible and non-edible, for their acidity or alkalinity! Also contains an extra tactivity, pH – Daily Life. Using litmus and/or pH papers, categorise items from daily life (like soap, fruits, shampoo, conditioner, antacids etc) as acidic, neutral or basic. ThinkTac TACtivities use simple and accessible materials to develop scientific temper by observing physical realities, testing, hypothesising, questioning and analysing. Variations are designed to encourage tinkering, creating opportunities to apply logic, problem solve and think critically and creatively. All TACtivities are linked to the curriculum and help understand underlying science concepts, assisted by topic guides and videos. Our App provides access to step-by-step videos, interactive simulations, variation videos, topic guides, topic videos and exploration games for most TACtivities.
