a student calibrated a beral pipet while holding it at two different angles. Whe

Question

a student calibrated a beral pipet while holding it at two different angles. When she held the pipet horizontally, it delivered an average of 30 drops ml-1. when she held it vertically, it delivered am average of 28 drops ml -1.

Calculate the volume, in liters, of one drop delivered from the horizontal pipet.

Calculate the volume, in liters, of one drop delivered from the vertical pipet.

Explain why it is crucial in this experiment that the pipet always be held at the same angle when counting the number of drops being delivered.

Explanation / Answer

Horizontal pipet position:

30 drops per 1 mL

1 drop = (1/30)mL = 0.03332 mL = 3.332x10 – 5 L

Vertical pipet position:

28 drops per 1 mL

1 drop = (1/28)mL = 0.03571 mL = 3.571x10 – 5 L

Different position of pipet gives different volume and thus the pipet should held always in same angle.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

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