eral Chemistry Lab I ent #9 . Lab Practical Exp #9-Laboratory Practical Prelab Q

Question

eral Chemistry Lab I ent #9 . Lab Practical Exp #9-Laboratory Practical Prelab Quiz Which statement is incorrect? red Select one: a. It is good practice to place the flask over a white background to better observe the color change of the solution. b. The endpoint is when the indicator changes color c. When the indicator changes color and remains, 2 more drops of the solution in the buret should be added. O stion O d. The volume of solution in the buret should be recorded when the endpoint is reached e. Phenolphthalein will go from a colorless solution to a pink solution for the addition of NaOH to an acid solution. Next page ous page

Explanation / Answer

Option C is incorrect .

Because endpoint of a titration is defined as a permanent change in color of the indicator when one excess drop of titrant is added to the flask .

So it means when one drop of reactant from burette ia added to the conical flask the indicator changes its color which means the reaction has reached its completion point. (approximate equivalence point).

after this Addition of 2 or more drops of reactants from the burette makes it excess and there Will be an error in the measurement of volume of titrant consumed during the reaction. I,e it effects the calculations of concentration of an unknown solution.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.