How does pH play ann important role in everyday life?

Explanation

pH in Our digestive syetm :
(I ) our stomach produces hydrocloric acid which helps in the diagestion of food without harming the stomach .
(ii ) During indigestion , if the stomach produces too much acid and this causes pain and irritation .
(iii ) pH of the stomach fluid is approximately 2.0.
ph of the saliva :
(i) pH of the saliva normally ranges between 6.5 to 7.5 .
(ii) When the pH of the mouth saliva falls below 5.5 , the enamel gets weathered .
(iii ) Toothpastes , which are generally basic are used for cleaning the teeth that can neutralise the excess acid and prevent tooth decary.
(ii ) Citrus fruits require slightly alkaline soil , while rice requires acidic soil and sugarcane requires neutral soil .
pH of rain water :
(i) THe pH of rain water is approximately 7, which means that it is neutral and also represents its high purity .
(ii ) If the atmospheric air is polluted with oxide gases of sulphur and nitrogen , they get dissolved in the rain water and make its pH less than 7.
(iii ) IF the pH of rain water is less than 7, then it is called acid rain .
(iv ) When acid rain flows into the rivers it jowers the pH of the river in such rivers becomes difficult .