Question

convert grams into vloume with the density of water being at .997514 g/cm^3 at 23.1 Celsuis find standard deviation and percent devaition.

please answer where the ? marks are

Pipetteing Range: 1000

Temperature 23.1 celsuis

Pipette setting: 700

Mass (mg). Volume (ul)

Trail 1. 0.5229g. ?

Trial 2. 0.3447g. ?

Trial 3. 0.3594g. ?

Average ? ?

standard deviation. ? ?

percent relative dev ? ?

3A. calculate the percent error between the pipette setting and the calculated volume devlivered?

3B. How did the standard devivation of values of Trail 1 compare to the values of Trail 2? which figure of merit (standard deviation or %RSD) is most appropriate for comparing percision of various techquines or peice of equipement? why?

Answer 1

The volume is calculated:

V = m / d = 0.5229 mg / 0.997514 mg / uL = 0.5242 uL

Trial 2 = 0.3456 uL

Trial 3 = 0.3603 uL

Average = 0.4100 uL

SD = 0.0991 uL

% SD = 0.0991 * 100 / 0.4100 = 24.17%

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