AnaChem LEc Quiz PF

A student added a weak acid as a titrant to a strong base. What issue might they encounter during endpoint detection?

• Rapid color change

• High buffer capacity

• Poor endpoint sharpness due to gradual pH change

• Complete precipitation

A buret used during titration had a faded 0.10 mL marking. What type of error might result?

• Systematic

• Random

• Gross

• Indeterminate

During the titration of acetic acid with NaOH, which indicator should be used?

• Methyl orange

• Phenolphthalein

• Bromothymol blue

• Methyl red

What happens to the pH at equivalence in the titration of a weak acid with a strong base?

• pH equals 7

• pH is acidic

• pH is basic

• pH cannot be determined

A student uses a very dark-colored indicator. Which type of error is most likely?

• End point too early

• Titration cannot proceed

• Human eye can’t distinguish the endpoint clearly

• Titrant neutralizes indicator

Which of the following would best serve as a primary standard?

• Sodium hydroxide

• Hydrochloric acid

• Potassium hydrogen phthalate (KHP)

• Sodium carbonate solution

When titrating a monoprotic strong acid with a strong base, what is the shape of the titration curve near equivalence?

• Flat

• Steep, sigmoidal

• Linear

• Constant

What causes a titration error?

• Excess acid remaining

• The difference between the equivalence point and endpoint

• Evaporation during titration

• Overheated solution

Which method can improve endpoint detection accuracy in complex titrations?

• Manual titration

• Gran plot or derivative curve plotting

• Constant stirring

• Using multiple indicators

In a gravimetric titration, what replaces volume as the measured variable?

• pH

• Time

• Mass

• Conductivity