NCERT solutions for class 7 science - Acid In this article, we will discuss the topic of Class 7 Science . We will discuss ‘ Acid, Base, and Salt ’. Substances are divided into Acid, Base, and Salt. ACID : The word Acid derives from Latin word ‘ACERE’ which means sour . Acid is sour in taste.Acid containing substances has sour in taste and the substance that sour in taste is called Acidic. The chemical nature of these substances is known as Acidic nature. For example – curd,orange juice,lemon, pickles, vinegar, etc. Types of Indicator : There are two types of indicators: Natural Indicator : Indicators that are derived from naturally occurring substance are called NATURAL INDICATORS. For example; turmeric, China rose,litmus, etc. Synthetic Indicator/ Artifical indicators : Indicators that are prepared in the laboratory are known as SYNTHETIC INDICATORS. For example; methyl orange,phenolphthalein, etc. BASE : Base is bitter in taste. Base containing substances has
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