How to calculate the percentage of KHP from NaOH in titration?
Example 3 -Assume we used 25 ml of NaOH to reach the endpoint using 0.1000 mol/L NaOH for titration of unknown sample of KHP. Calculate the percentage KHP in the unknown sample mass of 0.9735 g. Solution- The number moles of acid the following formula is used: 0.1000 mol/L NaOH x 0.02500 L NaOH x 1 mol KHP/1 mol NaOH = 0.0025 mol KHP
What is the titration of potassium hydrogen phthalate?
In this experiment, a NaOH solution of known concentration will be used to titrate measured masses of a sample containing an unknown amount of potassium hydrogen phthalate (abbreviated KHP but the formula is KHC 8 H 4 O 4 KHP and the strong base NaOH undergo an acid/base reaction with the following molecular
What does KHP stand for?
Determination of the Purity of KHP (Potassium Hydrogen Phthalate) EQUIPMENT and CHEMICALS dilute sodium hydroxide, 0.10 M NaOH potassium hydrogen phthalate (KHP), solid Phenolphthalein indicator.
What is the formula for potassium hydrogen phthalate (KHP)?
sample containing an unknown amount of potassium hydrogen phthalate (abbreviated KHP but the formula is KHC 8 H 4 O 4 KHP and the strong base NaOH undergo an acid/base reaction with the following molecular equation: KHC
What is the purpose of standardizing NaOH with KHP?
A sodium hydroxide solution of approximate concentration (0.2 M) is to be prepared. It is then standardized by titrating it against an accurately weighed sample of potassium acid phthalate (KHP), HOOC-C6H4-COOK , which is a primary standard acidic substance.
What is the purpose of titration of vinegar?
The purpose of vinegar analysis lab experience is to determine the acetic acid CH 3 COOH concentration and the mass percent of acetic acid in vinegar. A titration is a common analysis method that determines the concentration of an unknown solution with one known concentration solution.
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.
What does KHP stand for in chemistry?
Potassium Hydrogen Phthalate Potassium AcidPotassium Hydrogen PhthalatePotassium Hydrogen Phthalate Potassium Acid Phthalate, KHPChemical FormulaHOCO(C6H4)COOKFormula Weight204.22Equivalent Weight204.22 (Molar = Normal)CAS No.877-24-7
What is the purpose of titration?
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. The amount of reactants that have been mixed at the equivalence point depends on the stoichiometry of the reaction.
What is the conclusion of titration?
In the process of titration, a basic solution is gradually added to the acidic solution until complete neutralization is obtained. The 'end point' of the titration is detected with the help of an indicator as color of the solution changes upon neutralization.
How does KHP titrate with NaOH?
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.
Which indicator is used in the titration of KHP And anyway?
To standardize a sodium hydroxide (NaOH) solution against a primary standard acid [Potassium Hydrogen Phthalate (KHP)] using phenolphthalein as an indicator.
How do you standardize with KHP?
To Standardize: Weigh ~0.8 g of dried KHP (MW = 204.23 g/mol) into an Erlenmeyer flask and dissolve in 50-75 mL of distilled water. 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.
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 .
What is the pH of KHP?
The molar mass and Ka is 204.22 g/mol and 3.91×10−6 3.91 × 10 − 6 . Therefore, the pH of the KHP solution is 3.36 .
What are the solutions used in the vinegar titration?
By adding the sodium hydroxide, which is a basic solution, to the acetic acid, which is an acidic solution, a neutralization reaction occurs. An indicator known as phenolphthalein, is also added to the vinegar....Observations.Trial #Amount of NaOH used to standardize the vinegarTrial 38.70mL (±0.05mL)2 more rows
How can titration technique be used to determine the concentration of acetic acid in vinegar?
For an acid-base titration, the known chemical reaction in general is: acid + base → water + salt (1) and for the titration of the vinegar in this experiment the following specific reaction will be used to calculate the acetic acid content of the vinegar sample: HC2H3O2(aq) + NaOH(aq) → H2O(l) + NaC2H3O2(aq).
Is vinegar the titrant or analyte?
The analyte for this experiment is the acetic acid in vinegar with pH less than 7. Our titrant will be sodium hydroxide, a base.
What was the purpose of the phenolphthalein indicator in this experiment?
In this experiment, a phenolphthalein color indicator will be used. Phenolphthalein is colorless in acidic solutions and pink in basic solutions. Phenolphthalein is also used in forensic crime scene analysis to detect the presence of blood, Kastle-Meyer test.
How much KHP is needed for a 250 ml flask?
You will need to make 250 mL of approximately 0.1 M KHP. Clean a 250 mL volumetric flask, and rinse it several times with deionized water. Make sure to wet the inner walls of the flask completely each time.
How to determine the concentration of a weak acid solution?
You will do this by performing a series of titrations. A titration is an experimental technique for determining the concentration of a solution by reaction with something else. To perform a titration, a carefully measured amount of one reactant is added to an Erlenmeyer flask. An indicator is added that will signal the endpoint of the titration by a visible color change. Then the other reactant is added slowly to the flask using a buret. When the indicator changes color, the reaction is complete and the volume is measured. If you know the volumes of both solutions used and the concentration of one of the solutions, you can calculate the concentration of the other solution using stoichiometry.
How far in advance should you dry KHP?
*** One week in advance*** You should dry the standard KHP and solid unknown one week in advance. It may also be possible to boil the water in advance.
How to make NaOH solution?
Boil about 1.5 liter of distilled water for 5 minutes to remove carbon dioxide. This will allow you to make enough NaOH solution to do several experiments. Allow the water to cool covered with a watch glass; transfer while warm (40C) to your large plastic bottle.
