Why is potasssium hydrogen phthalate used as a primary.
Also to know, why is potassium phthalate selected as the primary standard?
The KHP is a suitable primary standard because it is stable as a solid and in solution, is not hygroscopic, and is easily dried.
Why isn't NaOH used as a primary standard?It is possible to absorb water from the air.H 2 O H_2O H2O is not suitable for use as a primary standard because they absorb it from the atmosphere.They are able to absorb carbon dioxide from the atmosphere.
People ask, what is the purpose of using potassium hydrogen phthalate in this experiment?
It's used to determine the concentration of the base.The weight and mass of the sample are known.
Many examples of primary standards can be found.It is used as a primary standard for silver nitrate reactions.After it has been dissolved in hydrochloric or sulfuric acid, zinc powder can be used to standardize the solution.
It is suitable to be used as a primary standard.It can't be obtained in a pure form.It readily reacts to any organic material in the water.It decays in the presence of sunlight.
The ion serves as its own indicator, so there is no need to add an indicator.The preparation of the solution will cause the formation of solid manganese dioxide, which is not a primary standard.
There are three main reasons why HCl is not suitable as a primary standard.It is not possible to obtain HCl at a very high purity.It does not have a high mass.
Pure sodium carbonate is not a hygroscopic reagent.A standard solution prepared by dissolving a known amount of the solid Na2CO3 in a fixed volume can be used to standardize other acid solutions.
A primary standard is a reagent that is pure and stable and has a high molecule weight.
A substance is a primary standard if it is easily available in high purity.Substances that can't be prepared directly are called secondary standards.For example, NaOH, KOH, etc.
Although both hydrochloric acid and H2SO4 are commercially available, they are not suitable for use as a primary standard because the concentration of the "concentrated" solution is not accurately known.
Solid NaOH absorbs water from the air so accurately weighing a sample during the preparation of a solution is impossible.The weakly acidic atmospheric carbon dioxide is absorbed by a solution of NaOH.
Why do we standardize a solution?When starting a chemical experiment, we should standardize Solutions (Reagents) because it will allow us to get correct readings during the experiment whereas the exact concentration of the solution could be different.
The first step to standardize NaOH is to pipetting 0.1 N hydrochloric acid into a flask.Add 50 liters of water and three drops of the red indicator.To record the initial volume, fill a 25 liter buret with the 0.1 N sodium hydroxide solution.
To standardize a base solution such as NaOH, an acid whose amount can be determined to a high degree of accuracy is needed.A monoprotic acid called KHP is often used as a primary standard.KHP can be dried in an oven.