what do alkalis have in common?
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Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. Common properties of alkaline aqueous solutions include:
Moderately concentrated solutions (over 10−3 M) have a pH of 7.1 or greater. This means that they will turn phenolphthaleinfrom colorless to pink.Concentrated solutions are caustic(causing chemical burns).Alkaline solutions are slippery or soapy to the touch, due to the saponification of the fatty substances on the surface of the skin.Alkalis are normally water-soluble, although some like barium carbonate are only soluble when reacting with an acidic aqueous solution.
Moderately concentrated solutions (over 10−3 M) have a pH of 7.1 or greater. This means that they will turn phenolphthaleinfrom colorless to pink.Concentrated solutions are caustic(causing chemical burns).Alkaline solutions are slippery or soapy to the touch, due to the saponification of the fatty substances on the surface of the skin.Alkalis are normally water-soluble, although some like barium carbonate are only soluble when reacting with an acidic aqueous solution.
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