chem TITRATION

1. If a student fails to remove a large air bubble in the buret before beginning the titration, what will be the effect on the volume of titrant required to reach the titration endpoint?
A. The student will record a volume that is SMALLER than it should be for a proper titration.
B. The student will record a volume that is EQUAL TO a proper titration.
C. The student will record a volume that is LARGER than it should be for a proper titration.

3. When using a pipet and pipet bulb, a right-handed student should:
A. Hold the pipet in his right hand at the TOP of the glass and the bulb in his left hand.
B. Hold the pipet in his right hand at the BOTTOM of the glass and the bulb in his left hand.

4. A student stopped her titration when she observed the pink color persist for 30 seconds, but she failed to swirl the flask. Were her volumes of titrant used too large, too small, or still right?
Answer: Is it still right?

7. An unknown solutionis found in the lab. If the solution turns pink when phenolphthalein is added, what does that tell you about the pH of the solution?
A. the solution is basic
B. solution is acidic
C It tells you nothing about the acidity and basicity
D. The solution is neutral.

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. 1. Wouldn't the volume be larger bc it takes up space and it will be added to the volume
    3. shouldn't it be A
    4. Still right?
    7. It tells you nothing about the acidity and basicity

    Are these right or wrong?

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  2. 4. The answer is either too small or too large but I am unsure.
    7. The solution is either basic, acidic, or tells you nothing about either, but I'm also unsure.

    Still correct choice for 4 is wrong and solution is neutral is wrong for 7.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  3. 1 and 3 are right. 4 and 7 are wrong. Phenolphthalein turns pink when pH is about 9 (range about 8 to 10) and that is basic. If the solution was pink for 30 sec that means the solution AT THAT ONE SPOT in the flask was OK but the entire solution was not titrated; therefore, most must be added. So the answer is that the volume of titrant was too small at that point.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The bubble in the tip of the buret is not removed prior to performing the NaOH standardization. Will the reported concentration of the NaOH be greater than, less than, or equal to the true concentration of the NaOH if the bubble

  2. Chemistry

    A student failed to notice an air bubble trapped in the tip of the buret during their experiment. What effect does this have on the calculated molarity of the NaOH solution?

  3. Career Prep

    once you've graduated from college how should you update your resume remove grades of indivisional courses**** remove inferences remove special skills remove volunteer experiences am I right?

  4. physics

    A 1.6 air bubble is released from the sandy bottom of a warm, shallow sea, where the gauge pressure is 1.6 . The bubble rises slowly enough that the air inside remains at the same constant temperature as the water. What is the

  1. physics

    at 25.0m below the surface of the sea (density=1.025kg/m^3), where the temperature is 5.00C, a diver exhales an air bubble having a volume of 1.00cm^3. If the surface temperature of the sea is 20.0C, what is the volume of the

  2. chemistry

    If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the

  3. chemistry

    Why is it important to make sure there are no air bubbles in the tip of a buret below the stopcock before using the buret to dispense a solution? What would be the % error if there were a 0.5 mL air bubble in the tip of a buret,

  4. Chemistry

    If a 0.5-mL air bubble is present in the tip of a buret, what percent error in 10-mL, 20-mL, and 40-mL samples will be result if the air bubble is dislodged during the dispensing of the samples?

  1. APChem

    If an air bubble passes unnoticed through the tip of a buret during a titration (where a weak nonvolatile acid HA is the analyte) , the calculated molar mass of HA would be too high, too low, or not affected? I thought it would be

  2. chemistry

    LiOH and NaOH can each react with CO2 to form the metal carbonate and H2O. These reactions can be used to remove CO2 from the air in a spacecraft. a. Write a balanced equation for each reaction. b. Calculate the grams of NaOH and

  3. college

    If a 0.5 -mL air bubble is persent in the tip of a buret, what error in 10-mL,20 m l and 40-mL samples will result if the air bubble is dislodged during the dispensing of the sample?

  4. CHEMISTRY

    If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution. The volume actually delivered by the buret will be __________ the volume your readings of the buret

View more similar questions or ask a new question.