Answer:
1. Molality.
2. Concentration.
3. Percent by mass.
4. Mole fraction.
Explanation:
Molarity is the measurement by which the number of moles is measured by a solute. The solution here is one liter respectively.
Concentration is the product which is emerged when the amount of the solute is divided by the amount o the solvent or solution.
Mole fraction refers to the number of component moles divided by the number of the solution moles.
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Explanation:
It is known that,
Molar mass of Cd = 112.41 g/mol
Standard concentration of Cd = 0.005 mg/L =
g/L
Hence, we will calculate the molarity as follows.
Molarity = 
=
M
Equation for the reaction is as follows.

![K_{sp} = [Cd^{2+}][OH^{-}]^{2}]](https://tex.z-dn.net/?f=K_%7Bsp%7D%20%3D%20%5BCd%5E%7B2%2B%7D%5D%5BOH%5E%7B-%7D%5D%5E%7B2%7D%5D)
![2 \times 10^{-34} = 4.45 \times 10^{-8} \times [OH^{-}]^{2}](https://tex.z-dn.net/?f=2%20%5Ctimes%2010%5E%7B-34%7D%20%3D%204.45%20%5Ctimes%2010%5E%7B-8%7D%20%5Ctimes%20%5BOH%5E%7B-%7D%5D%5E%7B2%7D)
M
Also,
![[H^{+}] = \frac{10^{-14}}{[OH^{-}]}](https://tex.z-dn.net/?f=%5BH%5E%7B%2B%7D%5D%20%3D%20%5Cfrac%7B10%5E%7B-14%7D%7D%7B%5BOH%5E%7B-%7D%5D%7D)
= 
= 
Relation between pH and concentration of hydrogen ions is as follows.
pH = ![-log [H^{+}]](https://tex.z-dn.net/?f=-log%20%5BH%5E%7B%2B%7D%5D)
= 
= 10.82
Thus, we can conclude that a minimum pH of 10.82 is necessary to reduce the dissolved cadmium ion concentration to the standard.
Answer:
A.), as it will decrease.