Principle Of Biology I (Online)

College Level: Principle of  Biology 1 Lab (course online)

 

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13 Lab Reports (due wkly on Monday by 12:00pm)**** Exercises, Experiments, Demostrations. A few questions may require explanation (word count 30+).No format

 

******13 Quizzes (due wkly on Tuesday by 12:00p) *** 30mins, *****10 multiple choice

 

Demostrations/ Experiments (Require photo upload) Typically 2-4 photos.

 

 

********Below is an example of one lab report and syllabus of course (to get an ideal of weekly assignments).

*********Will provide remaining assignments and quizzes after agreement

Water, pH, and Buffers

Hands-on labs, inc. Version 42-0136-00-01

 

Lab Report

 

PHOTOS – Include two digital photos with your lab report, either as separate attachments to an e-mail or paste into your document.

1. Photo #1 – Take a photo of the celery after it has been sitting for at least 4 hours.

Get close enough to see the results

 

2. Photo #2 – Take a photo of the HORIZONTAL needle observation.

Be sure you are close enough to see the needle and how it is relative to the water.

 

3. Photo #3 – Take a photo of your test results –

the layout of the commercial and homemade pH papers side by side

after dipping into each well. –It matches table #5

(This is the paper towel with the 12 numbers on it, with the papers beside the well #.)

 

Exercise 1: Water and its Unique Properties

Part I

 

 

Data Table 1: Needle Observations

Vertical: Horizontal:
   

 

 

 

 

 

Part ii

 

 

Data Table 2: Paper Clips Needed to Break Surface Tension

Hypothesis: Result:
 

 

 

 

Paper clips

 

 

 

 

Paper clips

 

 

Experiment

Water, ph, and Buffers

 

 

 

96

©Hands-On Labs, Inc.

www.LabPaq.com

 

 

 

 

Part iii

 

 

 

Data Table 3: Drops of Water

Hypothesis: Result:
   

 

 

 

Questions for parts i, ii, iii

 

A. How did the experiment in Part I demonstrate surface tension? Use your experiment

observations when answering this question.

 

 

 

 

 

 

 

 

B. In Part I, when adding the needle to the water, which approach worked best to balance the

needle on the water—the vertical or horizontal placement? Explain your answer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Part iV

 

 

Data Table 4: Part IV Observations

 

Observations:

 

 

 

 

 

 

 

 

Question for part IV

 

A. How did this activity demonstrate capillary action? Explain your answer using your experiment results and observations.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercise 3: Testing Common Household Materials

for pH Values

 

Observations

 

 

 

 

Data Table 5: pH Observations

 

Well

 

Plate

 

 

item tested

Commercial

 

pH strip

Homemade

 

pH strip

    Color pH Color pH
 

1

HCl

(hydrochloric acid)

       
 

2

NaOH

(sodium hydroxide)

       
 

3

 

Distilled water

       
 

4

Lemon juice        
 

5

Orange juice        
 

6

Coca cola        
 

7

       
 

8

         
 

9

         
 

10

         
 

11

         
 

12

         

 

 

 

 

 

 

 

 

Data Table 6: Analysis of Results

 

Well plate

 

item tested

Acid/B ase/ Neutral?  

Explanation:

 

 

1

 

HCl (hydrochloric acid)

   
 

 

2

NaOH (sodium hydroxide)    
 

 

3

 

 

Distilled water

   
       
       
       
       
       
       
       
       
       

 

 

 

 

 

 

Questions:

 

A. Compare and contrast the results between the commercial and homemade pH test strips. Which test strips were more accurate? Explain your answer.

 

 

 

 

 

 

 

 

B. Why is the pH scale important in science? Give several examples of scientific applications.

 

 

 

 

 

 

 

 

C. What information about a chemical can be inferred from knowing its pH value?

 

 

 

 

 

D. If a chemical has a pH of 3, how could you change its pH value to be more basic?

 

 

Exercise 4: Buffers in a Living System

 

Observations

 

 

 

Data Table 7: pH Change of Buffered and Unbuffered Solutions

  Unbuffered solution Buffered solution
Initial pH    
+ 3 drops HCl    
+ 6 drops HCl    
+ 9 drops HCl    
+ 12 drops

HCl

   
+15 drops HCl    
+18 drops HCl    

 

 

 

 

Questions:

 

A. Analyze the results of your experiment. Did the buffer resist changes in the pH? Explain your

answer using your experiment results.

 

 

 

 

 

Ex

p

e

ri

m

e

n

t

 

W

a

t

e

r

,

 

p

h

,

 

an

d

 

B

u

ff

e

r

s

 

96

 

©

H

a

nds

On

 

L

a

bs,

 

I

n

c

.

 

ww

w

.

L

a

b

P

a

q

.

c

o

m

 

 

 

 

 

W

a

t

e

r

, pH, and Buf

f

e

r

s

 

Hands

on

 

l

a

b

s,

 

inc.

 

V

e

r

sion

 

42

0136

00

01

 

 

Lab Report

 

 

PHOTOS

 

Include two digital photos with your lab report, either as separate attachments to an e

mail

 

or paste into your document.

 

1.

 

Photo #1

 

Take a photo of the

celery after it has been sitting for at least 4 hours.

 

Get close enough to see the results

 

 

2.

 

Photo #2

 

Take a photo of the HORIZONTAL needle observation.

 

Be sure you are close enough to see

the needle and how it is relative to the water.

 

 

3.

 

Photo #

3

 

 

Take a photo of your test results

 

 

the layout of the commercial and homemade pH papers side by side

 

after dipping into each well.

It matches table #5

 

(This is the paper towel with the 12

numbers on it, with the papers beside the well #.

)

 

 

 

 

 

E

x

e

r

cise 1:

W

a

t

er and its Unique P

r

operties

 

P

art

 

I

 

 

 

D

a

t

a

T

able 1: Needle O

b

se

r

v

a

tions

 

V

erti

c

al:

 

Hori

z

o

nt

al:

 

 

 

 

 

 

 

P

art

 

ii

 

 

 

D

a

t

a

T

able 2:

P

aper Cli

p

s Needed

t

o B

r

eak Sur

f

ace

T

ension

 

Hypothesis:

 

R

esult:

 

 

 

 

 

 

 

 

P

aper

 

cli

p

s

 

 

 

 

 

 

 

 

P

aper

 

cli

p

s

 

Experiment

 

Water, ph, and Buffers

 

96 ©Hands-On Labs, Inc.

www.LabPaq.com

 

 

 

 

Water, pH, and Buffers

 

Hands-on labs, inc. Version 42-0136-00-01

 

Lab Report

 

PHOTOS – Include two digital photos with your lab report, either as separate attachments to an e-

mail or paste into your document.

1. Photo #1 – Take a photo of the celery after it has been sitting for at least 4 hours.

Get close enough to see the results

 

2. Photo #2 – Take a photo of the HORIZONTAL needle observation.

Be sure you are close enough to see the needle and how it is relative to the water.

 

3. Photo #3 – Take a photo of your test results –

the layout of the commercial and homemade pH papers side by side

after dipping into each well. –It matches table #5

(This is the paper towel with the 12 numbers on it, with the papers beside the well #.)

 

Exercise 1: Water and its Unique Properties

Part I

 

 

Data Table 1: Needle Observations

Vertical: Horizontal:

 

 

 

 

 

Part ii

 

 

Data Table 2: Paper Clips Needed to Break Surface Tension

Hypothesis: Result:

 

 

 

 

Paper clips

 

 

 

 

Paper clips