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Do plants and animals have a $$pH$$ sensitivity?

Our body works in a $$pH$$ range of $$7.0$$ to $$7.8$$. Only a small range of $$pH$$ change allows living organisms to live. The $$pH$$ of different body fluids varies. For example, the $$pH$$ of blood ranges from $$7.35$$ to $$7.45$$. Any deviation in this value leads to diseases. The ideal $$pH$$ for blood is $$7.4$$.

pH in our digestive system:

Our stomachs contain hydrochloric acid, which helps in food digestion, thus causing no harm to the stomach. The stomach produces too much acid during indigestion, causing pain and irritation. The $$pH$$ of stomach fluid is about $$2.0$$.

$$pH$$ changes as the cause of tooth decay:

The $$pH$$ of saliva is usually in the range of $$6.5$$ to $$7.5$$. Calcium phosphate, the hardest substance in our body, is the white enamel layer on our teeth. When the $$pH$$ of the mouth saliva goes below $$5.5$$, the enamel gets weathered. Toothpastes, which are usually basic, are used to clean the teeth and neutralise excess acid, preventing tooth decay.

pH of soil:

In agriculture, the $$pH$$ of the soil plays an important role. For example, citrus fruits require slightly alkaline soil, while rice and sugarcane require acidic soil and neutral soil, respectively.

pH of rainwater:

The $$pH$$ of rainwater is approximately $$7$$, which means that it is neutral and represents its high purity. If the atmosphere is polluted with sulphur and nitrogen oxides, they get dissolved in rainwater and make the rainwater's $$pH$$ less than $$7$$. Acid rain is described as rainwater with a $$pH$$ of less than $$7$$. Acid rain decreases the $$pH$$ of river water as it falls into them. In such rivers, aquatic life has a hard time living.