Question

Which one of the following is a standard solution?
a.) It contains one gram equivalent mass of the substance in one litre solution
b.) Its strength is accurately known
c.) Its strength is to be determined
d.) A solution which has been prepared from pure substance

Answer 1

Hint: In order to deal with this question first we will come to the definition of standard solution further according to it we will select the right option.

Complete answer:
A solution containing a specifically defined quantity or substance is a typical solution in analytical chemistry. To achieve a given amount, a specified weight of solution is dissolved. It is made of a standard material, such as a primary standard. Generic solutions, such as titration solutions, are used to determine quantities of certain compounds. Standard solutions concentrations usually measured in units of moles per litre, moles per cubic decimetre ( $mol/{m^3}$ ), kilometers per cubic meter, or as applied to the units used in common titrations, such as titres. ( $mol/{m^3}$ ).
Standard solutions are solutions that have a defined and correct quantity of the material or product (i.e. concentration). These solutions are often used to help identify and determine the concentration of an unknown substance. Let's claim, an uncertain material when testing it, that we want all the tests to be as reliable as possible. As these solutions contain precise chemical component concentrations, confidence in the determination of unknown concentrations of substances will be improved.

Hence the correct answer is option B.

Note: There are two types of standard solution. First one is the primary standard solution and second one is the secondary standard solution. In primary standard solution, the solutions are pure and stable and the properties of these solutions does not change while secondary standard solutions are those solutions which are specified or made for a specified task by mixing solute in small quantity and solvent in large quantity.