12. You measure 5 ml of a solution and determine its mass on a balance. You repe

ID: 206026 • Letter: 1

Question

12. You measure 5 ml of a solution and determine its mass on a balance. You repeat this pro- cedure four times. You try the experiment again. This time you have four new values for mass, as shown below. Choose the statement that best describes your measurements. Experiment 15.7 g. 5.8 g, 5.7 g, 5.8 g Experiment 24.9 g, 5.0 g, 4.8 g, 5.3g a. The measurements in both experiments are accurate and precise. b. The measurements in both experiments are not accurate but are precise c. The measurements in experiment 1 are not accurate but are precise; the measurements t 2 are accurate but not precise. in experimen The measurements in experiment 1 are accurate and not precise; the measurements in experiment 2 are not accurate and not precise. d.

Explanation / Answer

As the standard deviation is very low in experient I when compared with experiment II, the answer is d. The measurement in experiment 1 are acurate and not precise, the measurement in experiment 2 are not accurate and not precise

Find the below standard deviations

Experiment I

Experiment II

Set I

5.7

4.9

Set II

5.8

Set III

5.7

4.8

Set IV

5.8

5.3

0.057735

0.216025