Question

importance of pH value in daily life

Answer 1

An example could be the pH dependance of enzymes in order to catalyze a specific reaction. If the pH is to high or low it may force the enzyme to strip a proton making a negative or a positive charge (or removing it) (consult the proteinogenic amino acids). This change may induce that the active site change structure so the substrate to be catalyzed do no longer fit or the mechanism of the enzyme has been ruined.

Another example, talking about mechanisms, is that some organic reactions, are acid catalyzed, meaning they need the proton to carry out the reaction.

Answer 2

Keeping the pH of the blood in our body is essential for our bodies to thrive. It does this through buffers which regulates the pH at a constant, which is approximately 7.4

Answer 3

Yes but for an example to keep pH at 7.4 is useless in the stomach, for example pepsin has it's pH optimum around 2.0 and is fully inactive when it reach the threshold about 6.7-7.0.
The pH has to be different in different environments in order to maintain the required reactions carried out by their respectable catalysts.

Answer 4

helps you digest your food (stomach acid)
regulates your breathing rate (carbonic acid in your blood)
controls microorganisms on your skin
activates enzymes

Your blood has a pH which needs to be maintained between 7.35 and 7.45, or else serious illness and death may occur.
Your stomach has a regulated pH of hydrochloric acid which is essential in digesting foods.
Wasps and jellyfish have an alkaline sting, and bees have an acidic sting. Therefore with wasps there stings can be treated with vinegar, and bees with soap

Answer 5

highly acidic or alkaline values of pH can be lethal due to denaturation of proteins - bonds between chains of proteins are torn, destroying their tertiary and secondary structures, thus losing their functionality.