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.

When KHP is added to NaOH what color changes?

Phenolphthalein is colorless in acidic solution, but turns red in basic solution. When one drop more NaOH is added than is required to react with the KHP in a sample, the sample becomes basic and the indicator changes color.

Why is potassium hydrogen phthalate KHP used to standardize the NaOH which will be used during the experiment?

Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. 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. It is not hygroscopic.

Why was phenolphthalein used in the experiment?

A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.

What is the chemical reaction involved in the standardization of sodium hydroxide?

NaOH + HOOC-C6H4-COOK → NaOOC-C6H4-COOK + H2O By measuring the volume of the ~0.2M NaOH solution dispensed from the buret that is necessary to react completely with a weighed sample of KHP, the exact concentration of NaOH solution is calculated.

Why is potassium hydrogen phthalate suitable to make a standard solution and not 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 is the chemical formula of potassium hydroxide?

KOH
Potassium hydroxide/Formula

Is phenolphthalein and sodium hydroxide a chemical change?

THe experiment result are : NaOH and phenolphthalein- First there was phenolphthalein in the test tube, then he add sodium hydroxide. There is when the half starts to change to purple color and after mixing it, it completely turns purple. chemical change.

What is reaction of acid with phenolphthalein?

Reaction of acid with phenopthalien turns colourless. For basic medium, it turns pink.

Why is sodium potassium phthalate an acid and not a base?

One of the most important is that an acid will react with a base to form something plus water. Sodium hydroxide is the most common base. A hydroxide is desperate for a hydrogen so it can form water. Then all you are left with is sodium potassium phthalate.

What happens when sodium hydroxide reacts with potassium hydrogen phthalate?

Potassium hydrogen phthalate reacts with sodium hydroxide. This means that realistically the sodium must react to make something with either the potassium, the hydrogen or the phthalate. Hydroxide will also have to react with one of those three things.

How do you standardize sodium hydroxide?

Primary standard potassium hydrogen phthalate will be used to standardize the sodium hydroxide. This monoprotic acid is a crystalline solid and must be dried for 2 hours at 110°C to remove adsorbed water. (Note 3) In order to keep it dry it will be stored in a desiccator until used.

What is the molecular weight of 1 potassium hydrogen phthalate?

Potassium hydrogen phthalate PubChem CID 23676735 Molecular Weight 204.22 Parent Compound CID 1017 (Phthalic acid) Component Compounds CID 5462222 (Potassium) CID 1017 (Phthal Date s Modify 2021-08-28 Create 2008-02-05