Question

A solution of known concentration is known as:
A.Molar solution
B.Normal Solution
C.Mole solution
D.Standard solution

Answer 1

Hint: When we know the weight of the solute being dissolved to make a specific volume then we know the concentration of the solution prepared. Concentration is the number of solute dissolved in per litre solution.

Complete step by step answer:
The solution with known concentration is known as the standard solution. Standard solutions are generally used in titration where the unknown concentration of a substance is determined using the solution of substance of known concentration. The concentration of standard solution is generally expressed in terms of molarity or moles per litre.
To prepare a standard solution we follow these steps-
1.First calculate and weigh the mass of solute to be used.
2.Dissolve it in distilled water.
3.Transfer it to a volumetric flask.
4.Add more distilled water to obtain the required volume. This process is known as dilution because we are adding water to the solution.

Hence the correct option is D.

Additional Information:
-Molar solution is the solution prepared by dissolving one mole of compound in one litre solution.
-Normal solution is the solution in which one gram equivalent of solute dissolved in one litre solution.

Note:
The properties of standard solution are-
-Its concentration should remain constant all the time. There should be no change in it with time.
-Its reaction with analyte (which is being analyzed) should be rapid to minimize the waiting period after reagent is added in the solution.