Name ______SAMPLE LAB REPORT______

Lab Day/Time _________________________

LAB REPORT FOR LAB 1 MEASUREMENT, pH, and THE SCIENTIFIC METHOD Grading rubric. Please staple to the front of your lab report: The report must be turned in with the items in the order listed in the rubric below. Each section of the report must be clearly labeled.

1. Initials must be present for credit. Instructor or TA initials indicating that you were present for the lab and that cleaned up your lab bench:

2. 2 points. Completed data Tables 1.1 through 1.3

3. 10 points Typed report: Is sodium chloride a buffer? i. 0.5 points. Title of lab

ii. 1.5 points Introduction-

iii. 2.5 points Data

iv. 3.5 points Discussion

v. 1.5 points Conclusion

vi. 0.5 points Acknowledgements

SAMPLE LAB REPORT LEAVE ON LAB BENCH DO NOT TAKE !!!!!!!!!!!

Measurement Data and conversions:

WASHER # DIAMETER OF WASHER (cm)

DIAMETER OF WASHER (m)

DIAMETER OF WASHER (mm)

Table 1-1: Diameter measurements of six washers with unit conversions.

WASHER # WEIGHT OF WASHER (g)

WEIGHT OF WASHER (kg)

WEIGHT OF WASHER (mg)

Table 1-2: Weight measurements of six washers with unit conversions.

Device used

Theoretical

volume dispensed

(mL)

Weight of container

Weight of container and water

Weight of

water only (g)

Actual volume

dispensed (mL)

% error

50mL graduated cylinder- try #1

50mL graduated cylinder- try #2 (if needed)

5mL serological pipet- try #1

5mL serological pipet- try #2 (if needed)

p200 micropipetter- try #1

p200 micropipetter- try #2 (if needed)

Table 1-3. Measuring volumes of water and determining the accuracy of the measurements.

Demo Student

Is Sodium Chloride a Buffer? Introduction Answer questions 1-3 in the lab guidelines in a single paragraph. DO NOT NUMBER YOUR SENTENCES. Be sure the sentences stand alone. I should not have to reread the questions to understand your answers. This is the only section that should be on this page. DO NOT WRITE YOUR DISCUSSION, CONCLUSION, or ACKNOWLEDGEMENTS on this page.

Data: Drops of 0.5M

HCl (Acid) pH of Water pH of Sodium

Phosphate Buffer

pH NaCl

0

1

2

3

4

5

Table 1-4. pH change upon acid addition to water and the buffer, sodium phosphate.

Drops 0.5M NaOH (base)

pH of Water

pH of Sodium Phosphate

Buffer

pH NaCl

0

1

2

3

4

5

Table 1-5. pH change upon base addition to water and the buffer, sodium phosphate.

After addition of 5 drops of acid or base: Tap

water: 0.5 M HCl

Tap water: 0.5 M NaOH

Sodium Phosphate

buffer: 0.5M HCl

Sodium Phosphate

buffer: 0.5M NaOH

NaCl: 0.5M HCl

NaCl: 0.5M

NaOH

pH increase or decrease

Total pH change

Fold change in H+ concentration

Table 1-6. Analysis of pH change upon addition of acid and base to tap water, buffer, and sodium chloride

Discussion Answer questions 1-7 in the lab guidelines in a single paragraph. DO NOT NUMBER YOUR SENTENCES. Be sure the sentences stand alone. I should not have to reread the questions to understand your answers. Make sure you answer ALL the questions. If you omit ANY of the questions, you will be marked down. Conclusion Answer questions 1-3 in the lab guidelines in a single paragraph. DO NOT NUMBER YOUR SENTENCES. Be sure the sentences stand alone. I should not have to reread the questions to understand your answers. Acknowledgements I would like to thank my lab partners Albert Einstein, Arthur Kornberg, and James Watson.