The importance and properties of the bases ( alkalis )
The bases ( alkalis )
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 .