Asked by Prisca Mukovoto
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
Answers
Answered by
Sada
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.
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.
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