Introductory Practical: Making and Recording Measurements
October 2012
Table 1: Volume Readings of Water in a 10 mL , 25 mL and 100 mL graduated cylinder and a buret
Station #
Measurement
apparatus
Volume of water
(cm3)
Uncertainty
1
2
3
4
10 mL graduated cylinder
25 mL graduated cylinder
100 mL graduated cylinder
50 mL buret
8.3
14.9
88.0
17.20
+/- 0.1 cm3
+/- 0.3 cm3
+/- 0.5 cm3
+/- 0.05 cm3
Table 2: Temperature of a water bath
Station #
Measurement
apparatus
5
Thermometer
Temperature of water
bath
0
C +/- 0.5
23.0
Uncertainty
Mass of sodium
chloride
(g)
0.99 g or 1.02 g
Uncertainty
+/- 0.5 0C
Table 3: Mass of sodium chloride (NaCl(s))
Station #
Measurement
apparatus
6
Electronic balance
+/- 0.01 cm3
Table 4: Mass and Volume Data in the determination of the density of water
Volume of water
(cm3 +/- 0.5 cm3)
Mass of water
Mass of water
Mass of water
(g +/- 0.02 g)
(g +/- 0.02 g)
(g +/- 0.02 g)
Trial 1
Trial 2
Trial 3
40.0
39.83
39.48
39.58
60.0
58.07
58.58
58.77
80.0
78.88
78.21
78.29
NOTE: the mass of water in the Erlenmeyer flask was determined by tareing the scale with the empty
flask before adding the various volumes of water to the flask. Therefore, the uncertainty of the mass
measurements is +/- (0.01g + 0.01g) = +/- 0.02 g
NOTE: when recording measurements, YOUR MEASUREMENT MUST BE RECORDED WITH THE SAME
NUMBER OF DECIMAL PLACES AS THE UNCERTAINTY – they must match!!!!