Determination of water hardness.

b’Subject: Chemistry’
b’Topic: determination of water hardness.’
b’This is lab data. The Yellow spaces are to be filled in and the dark blue are pre-calculated. I need the yellow spaces that are already filled to be checked and the empty yellow spaces to be filled in. \n\nNo paper formattinyzng or citations are needed’

Uncertainties for Scientific Glassware and Instrumentation
Instrument Uncertainty in each reading Electric Top-loading balance ± 1 for last figure displayed* Analytical balance ± 0.0001 g pH meter ± 0.05 pH units Laboratory clock ± 2 seconds Spectrophotometer ± 0.4% transmittance Thermometer
 1° calibration ± 0.5°
 0.1° calibration ± 0.05°
Glassware 50 mL Burette ± 0.02 mL 1 mL Pipette ± 0.006 mL 2 mL Pipette ± 0.006 mL 3 mL Pipette + 0.01 ++ mL 5 mL Pipette ± 0.02 mL 10 mL Pipette ± 0.02 mL 15 mL Pipette ± 0.03 mL 20 mL Pipette ± 0.03 mL 25 mL Pipette ± 0.03 mL 50 mL Pipette ± 0.05 mL 25 mL Volumetric flask ± 0.03 mL 50 mL mL Volumetric flask ± 0.05 mL 100 mL Volumetric flask ± 0.1 mL 250 mL Volumetric flask ± 0.1 mL 500 mL Volumetric flask ± 0.2 mL 1000 mL Volumetric flask ± 0.3 mL 50 mL Dispensette ± 0.05 mL Any mL Dispensette ± 0.5% Uncertainty is expressed either in the form of an absolute uncertainty (unit based) or as a relative uncertainty (percentage).
Examples
 Top loading balance: mass is 6.25 g. Absolute Uncertainty ± 0.01 g. Relative Uncertainty ± 0.2%
 Analytical balance: mass is 0.3582 g. Absolute Uncertainty ± 0.0001 g. Relative Uncertainty ± 3 x 10-2 % Many of your experiments will require that you include uncertainty with your collected data and calculations. There will be an introductory online module that will take you though the process for calculating absolute and relative uncertainty with respect to different calculation types that you will experience throughout the laboratory.
Note that some glassware, such as an Erlenmeyer flask, has volume marks indicated, but these are
intended for rough or approximate volumes only. Erlenmeyers are not to be used for measuring precise
volumes.

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Student Name:
Student Number:
Course:
Section: Data Set: # 3
Provided for guidance
Calculated values
Part A: burette readings (to be filled in)
Volume (mL) Uncertainty (mL)
Burette 1 14.1 0.02
Burette 2 19 0.02
Part B: Burette (50.00 mL)
Item Mass (g) Absolute Uncertainty (g) Relative Uncertainty (%)
Bottle +Lid 8.0768 0.0002 2.48E-03
Bottle +Lid + Liquid 17.3739 0.0002 1.15E-03
Liquid 9.2971 0.0004 4.30E-03
Burette Reading Volume (mL) Absolute Uncertainty (mL) Relative Uncertainty (%)
Initial 5.00 0.02
Final 14.00 0.02
Volume (mL) 9.00 0.04 4E-01
Density (g/mL) 1.033 0.005 4E-01
Part C: Volumetric Flask (25.00 mL)
Item Mass (g) Absolute Uncertainty (g) Relative Uncertainty (%)
Bottle +Lid 21.1302 0.0002
Bottle +Lid + Liquid 47.5483 0.0002
Liquid 26.42 0.0004 1.51E-03
Volume (mL) 25.00 0.03 1.20E-01
Density (g/mL) 1.057 0.030 2.88E+00
Part D: Pipette (10.0 mL)
Item Mass (g) Absolute Uncertainty (g) Relative Uncertainty (%)
flask + cork 43.5523 0.02
flask + cork + 10mL 54.1645
1st 10 mL aliquot 10.6122
flask + cork + 20mL 64.8061
2nd 10 mL aliquot 10.6416
flask + cork + 30mL 75.3966
3rd 10 mL aliquot 10.5905
Volume in each aliquot mL
%
Item Density (g/mL) Absolute Uncertainty (g/mL) Relative Uncertainty (%)
1st 10 mL aliquot 10.612
2md 10 mL aliquot 10.642
3rd 10 mL aliquot 10.591
AVERAGE Density 10.615 g/ml
%
Part E: Grad Cylinder (10 mL)
UNKNOWN ID:
Item Mass (g) Absolute Uncertainty (g) Relative Uncertainty (%)
Mass of Unknown 27.20
Item Volume (mL) Absolute Uncertainty (mL) Relative Uncertainty %
Volume of Liquid 4.3 0.1
Second Volume Reading 7.9 0.1
Volume of Unknown
Density (g/mL) Absolute Uncertainty (g/ml) Relative Uncertainty %
Density of Unknown
Part E: Burette (50.00 mL)
UNKNOWN ID:
Item Mass (g) Absolute Uncertainty (g) Relative Uncertainty (%)
Mass of Unknown
Item Volume (mL) Absolute Uncertainty (mL) Relative Uncertainty (%)
Initial buret reading
Final buret reading
Volume of Unknown
Density (g/mL) Absolute Uncertainty (g/mL) Relative Uncertainty (%)
Density of Unknown

 

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