a base is a metal oxide or metal hydroxide
most bases are insoluble in water
an alkali is a soluble base that produces hydroxide ions when dissolved in water
ammonia ionise partially to produce hydroxide ions when dissolved in water
have a bitter taste
feel soapy
conduct electricity due to presence of mobile ions when dissolved in water
turn red litmus paper blue
neutralisation : react with acids to form salt and water (AAWS)
react with ammonium salts upon heating to form salts, water, and ammonia gas (ammonia gas turns red litmus paper blue)
