17.How PH changes with change in concentration of H and OH ions.
18. Why sodium is kept deeped into kerosene?
19. What were the limitations of Dobereiner's classification ?
Answers
Answer:
17)As the concentration of hydrogen ions in a solution increase, the more acidic the solution becomes. As the level of hydroxide ions increases the more basic, or alkaline, the solution becomes.
18)Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
19)Two important limitations are: All known elements could not be classified into groups of triads on the basis of their properties . Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads
As the concentration of hydrogen ions in a solution increase, the more acidic the solution becomes.
As the level of hydroxide ions increases the more basic, or alkaline, the solution becomes.
Clinically, the concentration of hydrogen ions in the body is measured in units called pH units, which is a way to quantify the amount of [H+] in the form of a positive number.
18=}}Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.
19Dobereiner could find only three triads; . i.e total of 9 elements only.
However the total number of elements were more than that of those encompassed in Dobereiner's Triad.
Thus, Dobereiner's could not be classify most of the elements known at that time.