VR Tour For Std. 7 Ch. 5: Acids, Bases and Salts
What's Included in Virtual tour of this chapter
Litmus papers are basic indicators that indicate whether the solution or substance is acidic or basic. The acid converts blue litmus paper to red and the base converts red litmus paper to blue. We will also perform experiments through turmeric powder and understand this concept in detail. We will also understand how neutralization helps in indigestion. Neutralization is a process or a chemical reaction in which an acidic and basic substance is mixed with each other in order to neutralize their acidic and alkaline nature. The irritation of the skin due to ant bite is caused because of the presence of formic acid that the ant injects into the skin while biting. Hence we use a basic substance to neutralize the effect.
Virtual tour 1: The determination of acid and base
All the substances around us, have different tastes, right? Some are sour, some are bitter, some taste sweet and some are salty. So, we will learn in this virtual tour why different substances have different tastes. Litmus papers are basic indicators that indicate whether the solution or substance is acidic or basic. The acid converts blue litmus paper to red and the base converts red litmus paper to blue.
Virtual tour 2: Natural indicator: Turmeric patra
The most commonly used natural indicator is litmus. It is extracted from lichens. Generally, it is available as red and blue litmus paper. We will learn in this virtual tour how to check the acid and base of the solution through turmeric powder.
Virtual tour 3: The Neutralization process
Sometimes the stomach releases too much acid which leads to indigestion or sometimes hyperacidity. We are going to neutralize this acidity by taking substances that are basic in nature commonly known as antacids like ENO or baking soda.
Virtual tour 4: The ant bite: Neutralization in everyday life
All of us must have suffered from an ant bite once in our childhood. It does create a burning sensation in our bodies. It is because it secretes formic acid in our body. To neutralize the burning effect we will take a basic substance like baking soda and will rub it into the affected area which will give us immediate relief.