Role of pH in everyday life — lesson. Science State Board, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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.

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7. Role of pH in everyday life

Theory: