1.What is meant by a weak and strong base?Give two formulae of strong bases. 2.state the name of the base that is considered to be weak. 3.Amphoteric oxide?give two examples. 4.Alkali?two examples. 5.Neutral oxides;two example. 6.Acid anhydride. (ii)write the formula for the acid anhydride of nitric acid,HNO3
Okay, so for number one it asks for what is the difference between a weak base and a strong base. So acids and bases are usually dictated by the amount of H+ and (OH)- ions; in which a more acidic solution will have more H+ ions and a more basic solution will have more (OH)-. So the level of acidity is usually based off of the concentration of ions a solution has.
1. A weak base is a base that does not ionize completely in a solution. You see, how basic a solution is dictated by a pH scale of 1-14, in which bases always have a pH between 7 (neutral) and 14. A weak base is lower on the pH scale than strong bases, so its H+ concentration must be higher. When placed into an acidic solution, it does not ionize completely because of the relatively large concentration of H+ ions it has.
A strong base is something like sodium hydroxide or potassium hydroxide which is fully ionic. You can think of the compound as being 100% split up into metal ions and hydroxide ions in solution.
Each mole of sodium hydroxide dissolves to give a mole of hydroxide ions in solution.
Na+(OH)- + (aq) ===> Na+(aq) + (OH)-(aq)
As long as you can understand the concept, I am pretty sure you can work out number 1 now. As for the rest, I might answer them later because I am going to bed right now.