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Chemistry

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1. Mass of potassium hydrogen phthalate, KHP= 1.02 grams. (mixed with 50-90ml of distilled water) 

2.The KHP sample was dissolved in 100 mL of water. Find the mass of KHP per liter.

 

Mass per liter = _________ g/L.

 

 

3. Drops per mL from a dropping bottle = 27 drops/mL

 

 

4. End point of the titration of Potassium iodide

First trial = _____ drops. (My answer = 4)

Second trial = ______drops. (My answer = 5)

Average = _____ drops. (My answer = 4.5)

 

5. From Result 3 and 4, find the volume of the titrant = _____mL (My answer = 2)

 

6. From M₁V₁ = M₂V₂, the volume of KHP solution (Procedure 4), the molarity of the titrant, and the volume of the titrant, find the molarity of the KHP solution. The KOH solution is the titrant since it is used to titrate the KHP solution.

                 Molarity of KHP = _____ moles/L.

 

 

7. You now know the mass per liter of the KHP solution and the moles per liter of the KHP solution. Calculate the molar mass.

 

                 Molar mass = _____ g/mole.

 

8. Calculate the theoretical molar mass of KHP from its formula (KHC₈H₄O₄) and the atomic masses.

 

                 Theoretical molar mass = _____ g/moles.

 

9. The percent error is _____%

 

 

10. Explain your experimental error.

 

 

 

11. Give some suggestions that would reduce the experimental error.