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Meaning and types of bases

Answer Text:
Bases.
- Are substances that dissolve in water to yield /release hydroxyl ions;
- Just like acids they are bitter to taste;
Examples:
- Sodium hydroxide;
- Ammonium hydroxide;
- Calcium hydroxide;
Note:
- Some bases insoluble in water while some are soluble in water;
- Soluble bases are called alkalis;