bacause we need them to destroy sertain meterials
Many acids are dangerous in concentrated form because they are corrosive. Some acids can also be dangerous in dilute form.
Concentrated acids are more dangerous in generally, but some dilute acids can still be dangerous as well.
Concentrated acids are more dangerous.
Acids and alkalis with a high pH (1 or 2 for acids and 14 or 15 for alkalis) can be dangerous, like hydrochloric acid which can cause damage to the skin if contact with the acid is made. Acids and alkalis with a low pH (5 for acids and 11 for alkalis) aren't dangerous, as vinegar is an acid with that pH and toothpaste is an alkali.
Your eyes or skin can damage easily with some dangerous acids.
Some acids are not dangerous because they aren't strong acids. The strength of an acid/base is measured on the pH scale. The closer to 7 the weaker. Under 7, is an acid and above 7 is a base. If something has a pH of 1 then it is a dangerous acid, while acid with a pH of 6.5 are not dangerous for example.
Well many concentrated acids are dangerous, mostly corrosive, or poisonous.
as it is extremel dangerous to you and can harm you
There's no definitive answer to that. It depends on your definition of good and bad.However, there are strong acids and weak acids. The strong acids can be considered much more dangerous, and therefore "bad". The three worst acids by danger factor would be ...Hydroflouric acidSulphuric acidHydrochloric acidWeak, less dangerous acids include acetic acid (used in vinegar) and citric acid (found in oranges).Of course, this all depends on how concentrated the acids are. For example, if you make an almost pure acetic acid solution, it's actually quite dangerous. And if you make a very very weak hydrochloric acid you could probably shower in it without too much of a problem. Luckily it's very difficult or expensive to make concentrated solutions of some of the strong acids, ie. you'd rarely find hydrochloric acid over 30%.As a sidenote, please never underestimate how dangerous acids can be. My legs have massive third degree burn scars because I was half covered in 98% sulphuric acid (not a lie). If it had been hydroflouric acid I'd probably be dead.
some acids dont contain oxygen because some acids are already dangerous enough without the power of the oxygen but most of the time oxygen is in acids
No diseases occur. Sulfur helps make amino acids and amino acids make up protein. So deficiency would be a lack in synthesis of amino acids.
With great caution, obviously. Because they are both potentially very dangerous. Acids can be corrosive, irritant/harmful and even toxic. So you must always wash your hands after using them and wear gloves and make sure you NEVER put them anywhere near your skin at all and definitely not your face.