Theory:

We know that some substances taste bitter. But, do you know why?
 
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When we taste green leafy vegetables, cauliflower, broccoli, baking soda, it gives a bitter taste because they contain base. In other words, a base is a substance with more OH ions concentration.
The substance that contains more of OH ions are basic substances. Bases are compounds that contain oxygen along with hydrogen.
A base that contains oxygen is called an oxide, while a base that contains oxygen along with hydrogen is called the Hydroxide.
Types of Bases:
Bases are graded as strong or weak based on how they participate in a reaction.
 
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Strong bases: Some of the bases are corrosive and can cause skin irritation; they're called strong bases—for example, potassium hydroxide, sodium hydroxide, and calcium hydroxide.
 
Note: The complete dissociation of  OH ions takes place in strong acids.
 
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Weak bases: Some of the bases aren't especially corrosive; they're called weak bases—for example, magnesium hydroxide, ammonium hydroxide, copper hydroxide. The partial dissociation of  OH ions takes place.
Properties of bases:
 
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  • The taste of bases is bitter.
  • Bases turn red litmus into blue
  • Bases that can dissolve in water are known as alkalis, for example, potassium hydroxide and sodium hydroxide.
  • Soapy to touch.
 
Note: Neutral solutions are those that do not change the appearance of either the red or blue litmus paper during the test. These compounds are neither acidic nor basic in nature.