Question

What is a base? Name any two bases. How can you test the presence of a base in a substance (long answer type questions).​

Answer 1

♦ For testing the presence of a base in a substance, we can use acid-base indicators such as litmus paper. If u dip blue litmus paper into an acidic solution, its colour will change to red and vice versa for the basic solution. The tastes of acids and bases also differ. Acids are sour whereas bases are bitter.

♦ Examples of bases are sodium hydroxide, calcium carbonate and potassium oxide. A base is a substance that can neutralize the acid by reacting with hydrogen ions. Most bases are minerals that react with acids to form water and salts.

Answer 2

Answer:

A

substance that can neutralize the acid by reacting with hydrogen ions called as acid

• Most bases are minerals that react with acids to form water and salts.
• Bases include the oxides, hydroxides and carbonates of metals. The soluble bases are called alkalis
• example or e.g - soap, NAOH, KOH ,baking soda ,sugar solution etc
• calcium hydroxide used in soil when it is too acidic

we test presence of base by -

• Litmus paper - the colour changes of litmus paper from red to blue
• turmeric-it turn in red