Question 2 What are alkali?
Question 3 What is common in all bases?
Question 4 What are strong bases.Give example?
Question 5 What are weak bases.Give example?
Question 6 What happen when zinc granules are heated with sodium hydroxide solution?
Question 7 What happen when a base react with non-metal oxide?
For Example: NaOH,KOH, Mg(OH)2, NH4OH
NaOH(s) → Na+(aq) + OH–(aq)
For Example : NaOH, KOH
A base which partially ionises in water and produce small amount of hydroxide ions.
For Example : Mg(OH)2, Ca(OH)2
Properties of Bases
(2) They have soapy touch.
(3) They turn red litmus to blue.
(4) They conduct electricity.
(5) They react with some metals to form hydrogen gas.
2NaOH(aq) + Zn(S) → Na2ZnO2(S) + H2(g)
2HCl(aq) + Mg(OH)2(s) → MgCl2(aq) + H2O(I)
Ca(OH)2 + CO2 → CaCO3 + H2O