Periodicity is best defined as A. <span>the fact that elements increase in atomic mass in a regular way the repeating nature of physical and chemical properties. This is evident in the periodic table where elements belonging to one column has the same properties.</span>
Molarity is defined as number of moles of the solute in 1 liter of solution.
Molarity = Moles of solute (mol) / Volume of the solution (L)
moles of KCl = mass (g) / molar mass (g/mol)
= 10.0 g / 74.5 g/mol
= 0.134 mol
Hence molarity = 0.134 mol / 0.500 L
= 0.268 mol/L
According to Arrhenius concept a base is one which can donate hydroxide ion in its aqueous solution.
Here NaOH is a base as it can donate OH-.
As NaOH is a strong base it will have very high dissociation constant.
Due to high dissociation constant if will almost completely dissociate into sodium ions and hydroxide ions.
Thus in a solution of NaOH we will expect the following two ions
Na^{+} + OH^{-}[/tex]