What is the reaction between sodium hydroxide and potassium hydrogen phthalate?

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 does sodium hydroxide react with metals?

When sodium hydroxide reacts with certain dissolved metals, it forms a solid. This reaction is commonly used to remove dissolved metals from a solution, particularly if they are toxic. When a reaction involves transforming soluble ions into an insoluble solid it is known as a precipitation reaction.

What is potassium hydrogen phthalate and why is it used for standardization of an NaOH solution?

KHP is slightly acidic, and it is often used as a primary standard for acid–base titrations because it is solid and air-stable, making it easy to weigh accurately….Potassium hydrogen phthalate.

Chemical formula C8H5KO4
Molar mass 204.222 g·mol−1
Appearance White or colorless solid
Density 1.636 g/cm3

What is the chemical equation of the reaction between Koh and KH phthalate?

KOH(aq) + KHC8H4O4 (aq) → H2O(l) + K2C8H4O4 (aq) From the titration data, you will calculate the molarity of the unknown KHP solution to 4 significant figures.

Why is potassium hydrogen phthalate A good acid to use in the standardization of sodium hydroxide?

Potassium hydrogen phthalate makes for a good primary standard because it is stable, high in purity, non-hydroscopic, highly soluble, non-toxic, high in molecular weight, cheap, and available.

What color will the solution of potassium hydrogen phthalate turn to determine when the equivalence point has been reached?

faint pink color
As soon as very faint pink color persist you have reached the equivalence point. At the equivalence point, the number of moles acid will equal the number of moles base. Thus, we can determine the molarity of the acid by titrating a known volume of the acid solution with a known concentration and volume of a base.

Which metals can react with NaOH?

Metals like zinc and aluminium react with sodium hydroxide to produce gas. Metals like zinc and aluminium react with sodium hydroxide to produce gas.

Which metals do not react with sodium hydroxide?

Answer. hey dude, Aluminium will react vigorously. On the other hand, noble metals like gold or platinum will not react with sodium hydroxide.

How do you standardize NaOH with KHP calculations?

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 main purpose of acid base titration?

The concentration of a basic solution can be determined by titrating it with a volume of a standard acid solution (of known concentration) required to neutralize it. The purpose of the titration is the detection of the equivalence point, the point at which chemically equivalent amounts of the reactants have been mixed.

Is potassium acid phthalate the same as potassium hydrogen phthalate?

Phenolphthalein Indicator is most commonly used in titrations where KHP is used as an acidimetric standard to standardize solutions of bases….Potassium Hydrogen Phthalate.

Potassium Hydrogen Phthalate Potassium Acid Phthalate, KHP
Chemical Formula HOCO(C6H4)COOK
Equivalent Weight 204.22 (Molar = Normal)
CAS No. 877-24-7

Is KHP a strong or weak acid?

Potassium hydrogen phthalate ( KHP ) has the molecular formula C8H5KO4 and is known to be a weak acid. Because the concentration of water is presumed constant and therefore not included in the expression, the equilibrium constant for this reaction is called acid dissociation constant, Ka .