Why must NaOH be standardized before use in a titration?

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.

What does it mean for NaOH to be standardized?

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 is sodium hydroxide not used as a primary standard?

Such acid–base reactions can also be used for titrations. However, sodium hydroxide is not used as a primary standard because it is hygroscopic and absorbs carbon dioxide from air.

Why is it necessary to prepare a standard solution?

In analytical chemistry, a standard solution is a solution containing a precisely known concentration of an element or a substance. A known mass of solute is dissolved to make a specific volume. Standard solutions are used to determine the concentrations of other substances, such as solutions in titration.

Why is standardization in chemistry important?

The purpose of standardisation is to determine the concentration if titrant. For example you have to titrate some substance with HCl and you know that the strength of HCl is 0.5M, you will titrate it with NaOH first to check if the concentration of HCl is really 0.5M or not.

What is the purpose of a primary standard in acid base titration analysis?

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.

What is the purpose of titration of sodium hydroxide solution?

The purpose of this experiment is to determine the concentration of a solution of sodium hydroxide by titration against a standard solution of sodium hydroxide. Hydrochloric acid is a monoprotic acid in that it produces one mole of hydrogen ions per mole of compound, we can simplify the formula to HA.

What is the purpose of titration acid base experiment?

Titration Acid-Base (Simple) The purpose of this experiment is to determine the concentration of a solution of sodium hydroxide by titration against a standard solution of sodium hydroxide. Hydrochloric acid is a monoprotic acid in that it produces one mole of hydrogen ions per mole of compound, we can simplify the formula to HA.

What happens when sodium hydroxide is added to a solution?

As the base (sodium hydroxide) is added, the solution will then change color (this is referred to as the “stoichiometric endpoint”). This color change represents the increase of pH, as well as showing that the moles of the acid in the solution is equal to the moles of the base (Survey of Chemistry lab manual).

How do you find the concentration of hydrochloric acid by titration?

Analysis of Acid by Titration with Sodium Hydroxide. The formula M1xV1=M2xV2 was used to calculate the unknown concentration of hydrochloric acid. The results from the trials showed that the concentration of hydrochloric acid was 0. 2M. The concentration of the two acids should be relatively close in order to cancel each other out.