A primary standard is a reagent that is extremely pure, stable, has no waters of hydration, and has a high molecular weight.
A primary standard solution is generally a solution prepared and certified by an authorized and specialized institution (for example: NIST - National Institute for Standards and Technology).
This is the most exact and sure, certified standard for concentration in analytical chemistry.
it is primary standard........ but before making solution dry it at 120. C
primary standard solution is prepared by direct measurements of the mass of solute and the volume of solution.whereas, a secondary standard solution is a solution whose concentration can't be determined directly from weight of solute and volume of solution, the concentration must be determined by analysis of the solution itself.
HCl is a gas which is dissolved in water to form the solution the concentration expressed is very approximate so its not a primary standard.
there are two types of standard solution 1 primary 2 secondary
solution containig (3.3)gm na2co3 .h2o in (15ml)
A solution that has been titrated against a primary standard solution.
A primary standard solution is generally a solution prepared and certified by an authorized and specialized institution (for example: NIST - National Institute for Standards and Technology).
it is primary standard........ but before making solution dry it at 120. C
primary standard solution is prepared by direct measurements of the mass of solute and the volume of solution.whereas, a secondary standard solution is a solution whose concentration can't be determined directly from weight of solute and volume of solution, the concentration must be determined by analysis of the solution itself.
Titrate it with a primary standard
NaOH
HCl is a gas which is dissolved in water to form the solution the concentration expressed is very approximate so its not a primary standard.
there are two types of standard solution 1 primary 2 secondary
solution containig (3.3)gm na2co3 .h2o in (15ml)
Sodium chloride is a crystalline solid but can be dissolved in water to form a solution.
Sodium hydoxide cannot be used as a primary standard because of its hygroscopic properties as a solid. Because it is so prone to absorbing water, it is impossible to accurately measure the mass of a solid sample, so instead it must be put into solution and tirated with a known acidic solution, such as HCl. This makes it a secondary standard as opposed to a primary standard. By. Kuatsienu Divine
1 mol per dm cubed, and has no interactions between molecules.