Acids & Alkalis
In our activity kids were shown a plate full of different food items. This plate mainly had items with different types of acids in them such as tamarind with tartaric acid, banana with malic acid etc., . After which we had a discussion around why some items taste sour, salty, bland etc. Also, in baking, how cake dough rises to become soft and fluffy, the chemical reactions that take place due to baking soda ( sodium bi carbonate) and buttermilk in the recipe. Kids were able to guess acids are sour and baking soda , baking powder are bases. Then we talked about what is pH (power of hydrogen) scale and what it means in chemistry. What is a pH scale ? Scientists use the pH scale to measure how acidic or basic a liquid is. pH scale has a range from 0 to 14. From 0 to 7 are acids with 0 being the strongest acid. From 7 to 14 are bases with 14 being the strongest base. Since we can not be tasting every item to find out if it is a acid or base, the easi...