How do you standardize a NaOH solution with KHP?

To Standardize: Record the amount of KHP and water used. Add 4 drops of indicator into the flask and titrate to the first permanent appearance of pink. Near the endpoint, add the NaOH dropwise to determine the total volume most accurately.

What is the reaction between KHP and NaOH?

A commonly used primary standard for titration with sodium hydroxide solution is the weak acid potassium hydrogen phthalate or KHP (C8H5O4K). In this reaction as well, one mole of KHP completely reacts with one mole of NaOH. The titration of NaOH with KHP involves adding NaOH from the burette to a known volume of KHP.

How is sodium hydroxide standardized?

A sodium hydroxide solution of approximate concentration (0.2 M) is to be prepared. It is then standardized by titrating it against an accurately weighed sample of potassium acid phthalate (KHP), HOOC-C6H4-COOK , which is a primary standard acidic substance.

What is standardization of sodium hydroxide?

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.

How do you find the molarity of standardized NaOH?

The molarity of the NaOH solution is found by dividing the moles of NaOH by the liters of NaOH solution required to reach the endpoint of the titration. The mass percent of KHP in an unknown mixture is found by titrating a weighed sample of the mixture with the NaOH solution whose molarity was found in Part A.

Is KHP a primary standard?

Potassium Hydrogen Phthalate (KHP) is a classic primary standard substance in that it is readily available in high purity; is relatively inexpensive; is easy to dry; is neither hygroscopic, oxidized by air, nor affected by Carbon Dioxide (thus making it easy to weigh out); does not undergo decomposition during storage; …

What is standardization and why does NaOH have to be standardized?

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 standardization in chemistry?

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.