How can I calculate the percent KHP of KHP in a titration?
The moles NaOH used in the reaction can be converted to moles of KHP used in the reaction, and then the grams of KHP present in the previously weighed sample can be determined. This mass of KHP along with the mass of sample used in the titration allows calculation of the percent KHP in the unknown. KHP + NaOH → KNaP + H 2 O C O O- C O OH
What is KHP in phenolphthalein?
dilute sodium hydroxide, 0.10 M NaOH potassium hydrogen phthalate (KHP), solid Phenolphthalein indicator. unknown KHP buret clamp (or utility clamp) small, plastic funnel (optional) 50 mL buret 50 mL graduated cylinder beakers (100 mL, 150 ml) Purpose:
Is KHP a diprotic or monoprotic acid?
KHP is a monoprotic acid which provides one H+ ion. KHP is a monoprotic acid which provides one H+ ion. How would your results be affected if a diprotic acid (such as sulfuric acid, H2SO4) was used which provides two H+ ions? How do you calculate titration? Use the titration formula.
How to calculate the moles of KHP in volumetric flask?
Moles (n vf) of KHP in volumetric flask = m KHP /M KHP where M KHP is the Molar Mass of KHP (204.22 g) [c] KHP in 100 cm 3 volumetric flask = n/V Moles of KHP in 10 cm 3 of solution in where V is a given volume of water
Why is KHP used in titrations?
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 KHP to standardize NaOH?
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.
Why is phenolphthalein used for KHP and NaOH?
Phenolphthalein is usually used since it is easy to detect visually a slight pink color from a colorless liquid solution.
How do you standardize NaOH 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 difference between standardization and titration?
Standardization: Standardization is the technique used to find the exact concentration of a solution. Titration: Titration is the technique used to measure the concentration of a certain chemical component in a given solution.
Why is standardization necessary in titration?
The so-called titer determination or standardization of a volumetric solution used for titration is one of the most important preconditions for reliable and transparent titration results. Accurate and reliable titration results are only achievable when we work with the exact concentration of the volumetric solution.
How is KHP used during a titration to determine the concentration of a basic solution like NaOH aq )?
The titration of NaOH with KHP involves adding NaOH from the burette to a known volume of KHP. The molarity of the KHP solution is determined from the mass and volume of KHP used to prepare the KHP solution. The data from the titration is then used to calculate the molarity of the NaOH.
What does KHP and NaOH make?
The reaction between an acid and base produces a salt and water, something that you may have heard before. In the reaction that you will be investigating, the acid is potassium hydrogen phthalate (KHP), and the base sodium hydroxide (NaOH)....Stoichiometry and Solutions.M =molV(L)
Is KHP a strong 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 .
Is KHP a titrant?
Background: You will repeat exactly the same reaction, the neutralization of an acid (potassium hydrogen phthalate KHP) with a base (NaOH). This time NaOH will be your titrant, because you Page 3 know its exact concentration. The KHP will be the analyte because it is impure, so the amount you actually have is unknown.
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 in titration?
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.
Why is potassium hydrogen phthalate used to standardize the NaOH?
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.
What is the standard for NaOH?
Standardization is typically carried out by titrating the NaOH solution with a primary standard, an ultra-pure, easily soluble acid such as potassium hydrogen phthalate (KHP).
Is potassium hygroscopic or hygroscopic?
The potassium hydrogen phthalate (KHP) is a suitable primary standard because it is stable as a solid and in solution, it is soluble in water, it is not hygroscopic, it is easily dried and its molecular mass (approximately 200 g mol-1) results in convenient and accurately determined masses of the substance for making.
Qualitative Data
Potassium Hydrogen Phthalate ( referred to in the experiment as KHP) was a brittle, white, crystalline substance. The crystals required intense stirring before they could be dissolved in water. The resultant Acidic solution was transparent, with a small amount of undissolved granules of KHP.
Stoichiometric Calculations
Moles (n vf) of KHP in volumetric flask = m KHP /M KHP where M KHP is the Molar Mass of KHP (204.22 g)
Data Analysis and Conclusion
One experimental flaw which resulted in readings inconsistent with the literature value was due to human error. This flaw was due to allowing excess sodium hydroxide to flow, causing the KHP solution to become pinker than it should have. This might have caused some deviations because the volume of sodium hydroxide added was excess.
