Question

Similar to acids, there is another kind of group called as base/alkali. What are these? Are they also

harmful or useful?​

Answer 1

Answer:

Acids change the colour of litmus from blue to red.

They convert the colour of Methyl Orange from Orange/Yellow to Pink.

Acids turn the pink colour of Phenolphthalein to colourless.

Acids can conduct electricity.

Some Acids are highly corrosive in nature which means that they corrode or rust metals.

Acids tend to evolve hydrogen gas whilst reacting with an active metal such as Zn, Mg, etc.

They produce H+ ions when mixed with water.

Acids lose their acidity when mixed with a base.

When equal amounts of acid and base are combined the process of neutralization occurs and salt and water is formed,

The pH value of acid is from 0-6. Learn the concept of pH value here.

Acids are sour in taste.

STRONG ACIDS CAN BE HARMFUL

BUT BOTH WEAK AND STRONG ACIDS ARE USEFUL IN MANY WAYS

Answer 2

Hey Friend..

Here is the Answer.

Base/Alkali are compounds which release OH⁻ ions when added to water or in its aqueous solution. It converts Red Litmus to Blue.

• It tastes bitter
• Its pH value is greater than 7
• Feels soapy in touch
• Neutralises Acid when added to it

Just like Acids, it is also classified into two :-

⇔Strong Base

Strong base can cause damage when not handled properly. These are dangerous to naked eye and can't be handled with bare hands.

Bases that release  OH⁻ ions more readily in its aqueous solution and gets ionised easily comes under this category.

Examples :-

• NaOH
• KOH

⇔ Weak Base

Weak base/alkalis doesn't cause harm to hands and are less dangerous.

Bases that release  OH⁻ ions slowly in its aqueous solution and does not get completely ionised, comes under this category.

Examples :-

• NH₄OH
• Zn(OH)₂

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I Hope This Will Help You