Why must KHP be dried?

The KHP and acid samples must be dried so that their measured masses are actually proportional to the number of moles of each acid sample. If they were not dried, they’d be heavier than they should with the excess water.

Why must the KHP sample be dried if they are not dried Would the Calculated molarity of NaOH be higher or lower then the actual explain?

If they are not dried, would the calculated molarity of the NaOH be higher or lower than the actual value? Explain. If KHP (or the acid sample) is wet, the weight will contain water and therefore be greater. Therefore the molar mass of KHP will be greater, which will lead to a reduced molarity for NaOH.

What is KHP and why is it used to standardize NaOH?

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.

What properties of KHP enable us to use it as 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; …

Is KHP Monoprotic or Diprotic?

KHP is a monoprotic acid which provides one H+ ion.

What is meant by the end point of a titration?

end point: the point during a titration when an indicator shows that the amount of reactant necessary for a complete reaction has been added to a solution.

What is the purpose of phenolphthalein?

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

What is KHP used for titration?

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.

What is Khp used for titration?

Is Khp flammable?

Colour : Colourless Odour : Odourless Odour threshold : No data available pH : 4 – 4.02 0.05M solution at 25°C Melting point : 295 – 300 °C Freezing point : No data available Boiling point : No data available Flash point : No data available Relative evaporation rate (butylacetate=1) : No data available Flammability ( …