What does it mean for a solution to be standardized?
What does it mean for a solution to be standardized?
Standardization is the process of determining the exact concentration (molarity) of a solution. Titration is one type of analytical procedure often used in standardization. In a titration, an exact volume of one substance is reacted with a known amount of another substance.
What are standard solutions and how are they standardized?
Standard solutions are solutions of accurately known concentrations. They are standardized through a known amount of reactant and the weighed mass of an acid or base.
What is difference between primary and secondary standard?
A primary standard is a substance of known high purity (99.9% pure) which may be dissolved in a known volume of solvent to give a primary standard solution. A secondary standard is a substance whose active agent contents have been found by comparison against a primary standard.
What is the use of standard solution?
Standard solutions are solutions that contain a known and accurate amount (i.e. concentration) of a substance or element. These solutions are commonly used to help identify and determine the concentration of a substance whose concentration is unknown.
Why is standard solution important?
A known volume of a solution of acid can be standardized by titrating it against a solution of alkali of known concentration. Standard solutions are also commonly used to determine the concentration of an analyte species. The standard solution is a reference guide to discover the molarity of unknown species.
What is the primary standard used for?
A primary standard is a reference chemical used to measure an unknown concentration of another known chemical. It can be used directly when performing titrations or used to calibrate standard solutions.
Why Potassium permanganate is not a primary standard?
KMnO4 is not used as primary standard because it is difficult to obtain the pure state of KMnO4 as it is not free from MnO2. Also, the colour is so intense that it acts as its own indicator.
Is na2cr2o7 a primary standard?
K2Cr2O7 is less soluble in water. It can be found in pure state and can be accurately weighed. It is not hygroscopic in nature. So, K2Cr2O7 is used as a primary standard solution.
How do you make a standard solution of potassium permanganate?
Potassium Permanganate 0.1 N: Dissolve 3.3 g of reagent grade potassium permanganate (KmnO4) in 1 L of purified water and heat on a steam bath for two hrs. Cover and allow to stand for 24 hrs. Filter through a fine porosity sintered glass crucible, discarding the first 25 mL.
How do you prepare a regular solution?
Normal solutions are prepared by dissolving gram equivalent weight of solute making 1 litre of solution. It means, to prepare 1 liter solution, we have to dissolve the solute equal to the equivalent weight of the solute in grams.
What is the normality of the solution?
Normality is a measure of concentration equal to the gram equivalent weight per litre of solution. Gram equivalent weight is the measure of the reactive capacity of a molecule. The solute’s role in the reaction determines the solution’s normality. Normality is also known as the equivalent concentration of a solution.