The importance and properties of the bases ( alkalis )

The bases ( alkalis )

Acids and bases

Acids and bases

The bases are the substances that dissociate in the water producing the negative hydroxide ions (OH) , Examples of some bases such as sodium hydroxide ( the caustic soda ) NaOH , calcium hydroxide ( lime water ) , and potassium hydroxide (KOH) .

The properties of the bases ( alkalis )

The bases change the colour of litmus paper into blue due to the presence of the negative hydroxide ions (OH)  , The aqueous solutions of the bases have a bitter taste and the bases destroy the chemical properties of the acids .

The bases feel slippery  and  soapy as they dissolve the fatty acids and oils from your skin , the bases are involved in the production of soap , The bases which are soluble in the water are called the alkalis , and the chemical formula of all alkalis ends with (OH) .

The bases conduct an electric current , This is a common property shared with the salts , the acids , and the  bases , The salts are grouped together into a category called electrolytes , The bases react with oils and grease to form soap molecules and they have the tendency to corrode metal surfaces .

The strong bases  can burn your skin , so you should not touch the bases and the acids with your bare hand as they have corrosive effect on the skin , The bases are good conductor of the electricity and they show a pH value of more than 7.

The reaction between a base and a metal form the salt and release hydrogen gas , and this reaction can only occur when a metal is strong enough to displace another metal from its parent constituent .

The types of the bases

There are the strong bases (  They are completely ionized in water to produce hydroxide ions ) and the weak bases  ( They are Partially ionized and the equilibrium lies mostly towards the reactants side .

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