What are the characteristics of the composition of the base?
Metal ions and hydroxide ions
Can provide electronic pairs of substances. (Some salt solution of the pH value is greater than 7, but it is not a base, such as: soda ash (sodium carbonate) Na2CO3, baking soda (sodium bicarbonate) NaHCO3, etc.)
The anions obtained when ionizing are all OH- are bases; alkali: OH- and metal ions (or NH4).
