
(a)
Interpretation:The molarity of each ion in the given solution needs to be determined.
Concept introduction:Molarity is a way of expressing the concentration in terms of number of moles present in volume of solution (in litres). The formula for molarity is:
(a)

Explanation of Solution
Given:
Mass of:
Density of the solution =
Mass of sample = 1.00 kg
The volume of the solution is calculated as:
Substituting the values:
Since, all the compounds are present in the same solution so, the volume of for all is 0.976 L.
Now, calculating the number of moles of each compound using formula:
Substituting the values in above formula and calculating the moles for:
Now, calculating the molarity of each compound as:
Since, moles of
Since, moles of
Since, moles of
Since, moles of
Since, moles of
Since, moles of
Since, moles of
(b)
Interpretation:The total molarity of alkali metal ions needs to be calculated.
Concept introduction: Molarity is a way of expressing the concentration in terms of number of moles present in volume of solution (in litres). The formula for molarity is:
(b)

Explanation of Solution
Alkali metals are group 1 metals of the periodic table. So, from the given compounds the alkali metal ions are:
So, adding up the values of each concentration as:
(c)
Interpretation: The total molarity of alkaline earth metal ions needs to be calculated.
Concept introduction: Molarity is a way of expressing the concentration in terms of number of moles present in volume of solution (in litres). The formula for molarity is:
(c)

Explanation of Solution
Alkaline earth metals are group 2 metals of the periodic table. So, from the given compounds the alkaline metal ions are:
So, adding up the values of each concentration as:
(d)
Interpretation:Total molarity of anions needs to be calculated.
Concept introduction: Molarity is a way of expressing the concentration in terms of number of moles present in volume of solution (in litres). The formula for molarity is:
(d)

Explanation of Solution
Anions are negatively charged species due to gain of electrons. So, from the given compounds the sum of addition of concentration of anions are:
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Chapter 4 Solutions
Principles of General Chemistry
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