Did the volume of water you used to dissolve your KHP affect the results of your standardization?
Did the volume of water you used to dissolve your KHP affect the results of your standardization? Briefly explain your answer. The amount of water utilized is no consequence to the calculations. It is added to dissolve the KHP so that the neutralization reaction can proceed to completion.
What is the role of KHP in the standardization of sodium hydroxide?
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 the function of KHP?
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 do we use a solid KHP 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; …
Why must the KHP sample 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 did you use the FeCl3 KCl HCl solution as a blank?
FeCl3-KCl-HCl solution is used instead of water because the aspirin ferric ion complex contained FeCl3-KCl-HCl and ASA, but we only want to test the absorbance of ASA, not anything else. By using FeCl3-KCl-Hcl as the reference , we are taking that solutions absorptivity into account.
What is the reaction that takes place between KHP and NaOH?
neutralization reaction
reaction is called a neutralization reaction because two caustic compounds, KHP, a mild acid, and NaOH, a strong base, are replaced by water and a weaker base.
What is the nature of KHP?
Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. It forms white powder, colorless crystals, a colorless solution, and an ionic solid that is the monopotassium salt of phthalic acid.
Is KHP Monoprotic or Diprotic?
KHP is a monoprotic acid which provides one H+ ion.
Is KHP chemically stable?
Chemical Stability: Stable under normal temperatures and pressures. Conditions to Avoid: Incompatible materials, dust generation, excess heat. Strong oxidizing agents, nitric acid.
What happens if KHP is wet?
If the KHP is wet, the calculated molarity of NaOH will be higher than it actually is. Water weight in KHP will skew results of the standardization because the weight you think you have of KHP is not the real weight. If you have water, it will add to the weight and you will over-titrate.