Shenay Isaac
Unit 2 Assignment 1
(D1)
Calibration of a mass balance, a pipete and a pH meeer
Mass balance
Meehod:
We switched on the mass balances and allowed a few minutes for the device to achieve a
thermal equilibrium. We then checked for the correct levelling as many are fted with a
liquid spirit level. We pressed the calibraton buton on the mass balance and allowed it
sufficient tme to change modes. The mass balance is given a known balance. We used a
weight of 200g.We placed a calibraton weight of 200g on the pan. The reading must have
been within the manufacturers reading levels, if not there is no adjustment yet if it is then
we adjust the reading.
Our reading on the mass balance was 200g so the reading was not out by any grams so
therefore no adjustment was needed.
I compared these results with two other class mates that chose the same known balance as I
did and they both got the same results as I did. This shows reliability and consistency of the
results. The reading was also seen as reliable as the mass balance gives its measurements
digitally so this defeats the complicaton of human error.
Due to the reading being out by 0 grams, if this balance was used in an experiment the
results would be very reliable.
10ml glass pipete
Meehod:
We poured distlled water into a boiling tube. We then placed a thermometer into the
distlled water for at least a minute and then measured the temperature of the water. We
placed an empty beaker on the mass balance and waited for it to read as ‘0’. We used the
10ml glass pipete to pipete a volume of 10ml of distlled water in the empty glass and
measured it.
My results showed that the temperature of the distlled water was 21.6 degrees and the
mass of the distlled water was 9.739g. We used a density vs. temperature chart to fnd the
density of the water.
Using the equaton ‘Volume=mass x density’
And we discovered the volume to be 9.718.
Concluding from my results, I believe that my results were relatvity accurate as the actual
pipeted volume was 10ml and my volume was equalled to 9.718 which is very close to the
known volume. My result was of the 10ml measurement by 0.282.
I compared my results with two other individuals in my class. There results were:
1. Temperature=21.6, mass=9.739, volume=9.718
2. Temperature=23.1, mass=9.739, volume=9.709
Unit 2 Assignment 1
(D1)
Calibration of a mass balance, a pipete and a pH meeer
Mass balance
Meehod:
We switched on the mass balances and allowed a few minutes for the device to achieve a
thermal equilibrium. We then checked for the correct levelling as many are fted with a
liquid spirit level. We pressed the calibraton buton on the mass balance and allowed it
sufficient tme to change modes. The mass balance is given a known balance. We used a
weight of 200g.We placed a calibraton weight of 200g on the pan. The reading must have
been within the manufacturers reading levels, if not there is no adjustment yet if it is then
we adjust the reading.
Our reading on the mass balance was 200g so the reading was not out by any grams so
therefore no adjustment was needed.
I compared these results with two other class mates that chose the same known balance as I
did and they both got the same results as I did. This shows reliability and consistency of the
results. The reading was also seen as reliable as the mass balance gives its measurements
digitally so this defeats the complicaton of human error.
Due to the reading being out by 0 grams, if this balance was used in an experiment the
results would be very reliable.
10ml glass pipete
Meehod:
We poured distlled water into a boiling tube. We then placed a thermometer into the
distlled water for at least a minute and then measured the temperature of the water. We
placed an empty beaker on the mass balance and waited for it to read as ‘0’. We used the
10ml glass pipete to pipete a volume of 10ml of distlled water in the empty glass and
measured it.
My results showed that the temperature of the distlled water was 21.6 degrees and the
mass of the distlled water was 9.739g. We used a density vs. temperature chart to fnd the
density of the water.
Using the equaton ‘Volume=mass x density’
And we discovered the volume to be 9.718.
Concluding from my results, I believe that my results were relatvity accurate as the actual
pipeted volume was 10ml and my volume was equalled to 9.718 which is very close to the
known volume. My result was of the 10ml measurement by 0.282.
I compared my results with two other individuals in my class. There results were:
1. Temperature=21.6, mass=9.739, volume=9.718
2. Temperature=23.1, mass=9.739, volume=9.709
