Answer: The pH of the solution will decrease by 1 unit.
Explanation:
Let say the hydronium ion concentration of a solution is 0.001
pH = - log [H+]
= -log 1.0 x 10^3 = 3
if the hydronium ion concentration is increased by 10 , that is: 0.001 x 10 = 0.01
pH = -log [1.0 x 10^2]
= 2
Therefore, the pH is reduced by 1 unit when the hydronium ion concentration is increased by a factor of 10.
Vapor pressure is a criteria for a substance's volatility. This is the ability of a substance to transition from liquid to vapor. When the vapor pressure equals the external pressure, liquid turns to gas. Hence, if the substance has higher vapor pressure, then it is volatile. <em>Therefore, Sample A is more volatile than Sample B.</em>
Dobereiner 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