A student used a pipette to place 25.00 mL of HCl into an Erlenmeyer flask. Then the student diluted the acid with distilled water and added a few drops of phenolphthalein to the flask. The sample was titrated with a sodium hydroxide solution until a faint pink color became permanent. The procedure was repeated 4 more times. The following results were obtained: Volumes of NaOH used for each trial: Trial 1 37.22 mL Trial 2 36.14 mL Trial 3 36.13 mL Trial 4 36.15 mL Trial 5 36.12 mL Which of the following is the most probable explanation for the variation in the student's results for Trial 1? A. Water in the pipette B. Water in the burette C. Water in the flask D. Misread a 7 for a 6 on the burette.
A student used a pipette to place 25.00 mL of HCl into an Erlenmeyer flask. Then the student diluted the acid with distilled water and added a few drops of phenolphthalein to the flask. The sample was titrated with a sodium hydroxide solution until a faint pink color became permanent. The procedure was repeated 4 more times. The following results were obtained:
Volumes of NaOH used for each trial:
Trial 1 37.22 mL
Trial 2 36.14 mL
Trial 3 36.13 mL
Trial 4 36.15 mL
Trial 5 36.12 mL
Which of the following is the most probable explanation for the variation in the student's results for Trial 1?
| A. |
Water in the pipette |
|
| B. |
Water in the burette |
|
| C. |
Water in the flask |
|
| D. |
Misread a 7 for a 6 on the burette. |
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