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Acid and Base ppt

Acids and bases are effected both chemistry and everyday living. Both of these compounds can easily recognise with their taste. Acids have sour taste, and bases are bitter to the taste. Do you know why an orange or lemon is sour in taste? Have you tasted mustard seeds, what your mom is using for making delicious food? Orange and lemon are sour in test because of presence of acid in that, while Mustards and medicines are examples of a base. Acids can be found in many substances, including food. Mainly it’s present in fruits. The most common example is citric acid present in citrus fruits like orange, lemon and vinegar contains acetic acid. Some acids are invariably used in laboratory, like; hydrochloric acid, sulphuric acid and nitric acid. The water soluble bases are called alkalis.  

In general, these are usually found in grime cleaners which help in cleaning grease from metallic frames and floors and are found in the soap, toothpaste, egg whites, dish washing liquids and household ammonia. Have you ever thought the presence of any acid or base in your body? Yes, our body contain some very common acid like dilute hydrochloric acid in stomach, which involve in the digestion of food. If stomach contents of ours become little acidic, we usually end up in indigestion and burning sensation in stomach. Acids and bases are also regulating many metabolic activities in human body carried out by equilibrium processes and effect. Stings of bees are found to be acidic in nature while wasp stings are supposed to be alkaline in nature.

We can explain the concept of acids and bases with the help of ppt presentation which must start with introduction and moves to general properties of acid and base. Let’s discuss few of the properties of these compounds. All acids characterised by H+ in solution and base by hydroxide ion OH-. The best way to identify the presence of acid and base is to use litmus paper which shows a color change in acidic and basic medium. Now explain some more indicators which can be used to identify the acidic and basic nature of compounds. Red litmus paper turns blue if exposed to an acid, and blue litmus paper turns red when a base is present. Other natural detectors, besides taste, are red onions, red cabbage and grape juice. In very acidic conditions, the colour is red. In alkaline solutions, it will be go from blue to green. Red cabbage juice which is purple in color changes to red in acidic medium and yellow in basic medium.

Therefore an indicator is a chemical that shows change in color in acidic and alkaline medium. Many other indicators change color when the medium fluctuates. One such is phenolphthalein. It shows deep pink color in a basic medium and colorless in an acidic medium. The addition of phenolphthalein solution in sodium hydroxide changes the color of solution to pink. Now addition of any acid to this pink solution turns it to colorless. Methyl red is another most commonly used as an indicator in laboratory for titrations. In a basic solution, methyl red turns yellow in colour. When we chop an onion, we are breaking some open onion's cells which release enzymes. These enzymes act on one of the flavouring components of onions and contain mainly allicin which is a S-containing compound. It is responsible for volatile irritant "fumes" up from the onion and irritates our eyes.