Why was standardization of the NaOH solution necessary?

But when it comes to anything analytical where you start to involve calculations, standardization is a must. This is done with NaOH because it’s hygroscopic and readily sucks up the moisture in the air. So what is being weighed isn’t totally NaOH, but also the moisture that it has absorbed.

Why do we do standardization in chemistry?

Standardization: Standardization is used to find the exact concentration of a solution which is prepared for another analysis. Titration: Titration is used to find the unknown concentration of a chemical component in a given sample.

Why HCl is a secondary standard?

A HCl solution is used as it can be prepared accurately and is quite stable. Because of this stability it is called a secondary standard. Even more accurate and stable standards are called primary standards.

Why HCl and NaOH are not standard?

Hydrochloric acid, HCl, and sulfuric acid, H2SO4, are NOT suitable for use as a primary standard because although they are both commercially available as concentrated solutions that are easily diluted, the concentration of the “concentrated” solution is NOT accurately known.

What does it mean to standardize the NaOH solution?

Standardization is the process of determining the exact concentration (molarity) of a solution. In the first standardization the molarity of a sodium hydroxide solution (NaOH) will be determined by titrating a sample of potassium acid phthalate (KHP; HKC8H4O4) with the NaOH.

Why do you need to Standardise HCl?

The so-called titer determination or standardization of a volumetric solution used for titration is one of the most important preconditions for reliable and transparent titration results. Accurate and reliable titration results are only achievable when we work with the exact concentration of the volumetric solution.

Can HCl be used to standardize NaOH?

NaOH can be standardized by oxalic acid standard. Na2CO3 is primary solution and it can be a standard solution for HCl. HCl can be a standard solution for NaHCO3.

Why HCl not suitable as a primary standard?

Why is NaOH a secondary standard?

Note: NaOH is secondary standard because NaOH contains impurities of NaCl, Na2SO4 etc. It absorbs water from the atmosphere and determines the concentration of NaOH in a solution, which is titrated against a primary standard weak acid.

What is a standard solution of NaOH?

Such solutions are referred to as standard solutions. The reaction between solutions of HCl and NaOH is illustrated by Equation 1. In this experiment, standardization of a NaOH solution will be carried out either using KHP as the primary standard or by using a standard HCl solution of known concentration.

Why is solid NaOH used in titration?

First of all, solid NaOH absorbs water from the air, so accurately weighing a sample during the preparation of a solution is impossible. Once the NaOH solution has been standardized and its concentration is well-known, it can be used to titrate other acid solutions such as HCl.

Why do we need to standardize HCl?

The reason is that the original HCl has a concentration that is not precisely know. If a solution is not a standard already, it must be standardised in order to use it. A standard solution is a solution whose concentration is known precisely.

How do you standardize sodium hydroxide solution?

This experiment involves two separate acid-base standardization procedures. In the first standardization the molarity of a sodium hydroxide solution (NaOH) will be determined by titrating a sample of potassium acid phthalate (KHP; HKC8H4O4) with the NaOH.