16 Jun How did the color of the bromthymol blue solution
Question
CARBON DIOXIDE PRODUCTION BY GERMINATING SEEDS
INTRODUCTION:
Living things need energy to carry on most of their processes. The cells of germinating seeds oxidize carbohydrates, in the process known as cellular respiration, to provide energy for growth. In this process, carbon dioxide is released as a byproduct. The balanced equation for cellular respiration (oxidation of glucose) is as follows:
C6H12O6 + 6 H2O + 6 O2 —> energy + 6 CO2 + 12 H2O
The increasing concentration of carbon dioxide, in a closed environment, can be observed using a pH indicator solution. As carbon dioxide dissolves in water, it produces carbonic acid. As the carbonic acid concentration increases, the pH lowers.
In this lab, you will observe the formation of carbon dioxide by germinating seeds using bromthymol blue solution as the indicator. As more carbon dioxide is absorbed, and the pH lowers, bromthymol blue turns from blue to green to yellow.
MATERIALS:
50 Pea seeds for sprouting
2 one-quart jars with airtight lids
Beaker or small jar to soak seeds
Paper towels
2 test tubes
Bromthymol blue solution
Water
PRE-LAB:
Soak the pea seeds for 24 hours before the lab.
PROCEDURE:
1. Obtain 2 one-quart jars with airtight lids and place several layers of moist paper towels in the bottom of each jar.
2. Place 50 presoaked peas in the first jar. Fill 2 test tubes half full of bromthymol blue solution, and stand 1 tube in each jar.
3. Place the lids on the jars tightly and keep the jars on a shelf or table, undisturbed, at room temperature. Figure 1 shows the test jar, and figure 2 shows the control.
4. Observe the jars each day, and record the color changes of the bromthymol blue on your DATA TABLE. Remember, the observation after the jars are set-up, is for day zero.
DATA TABLE: Carbon Dioxide Production by Germinating Seeds.
Date
Jar with Peas
(test jar)
Jar without Peas
(control)
Day zero
blue
blue
ANALYSIS:
Question 1. How did the color of the bromthymol blue solution in your test jar change over time?
Question 2. What can be inferred from the change observed in question 1?
Question 3. Was there a color change in the control jar (the jar with no seeds)?
Question 4. What can be inferred from the change observed in question 3?
Question 5. Why was it necessary to have a control for this experiment?
Our website has a team of professional writers who can help you write any of your homework. They will write your papers from scratch. We also have a team of editors just to make sure all papers are of HIGH QUALITY & PLAGIARISM FREE. To make an Order you only need to click Ask A Question and we will direct you to our Order Page at WriteDemy. Then fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Fill in all the assignment paper details that are required in the order form with the standard information being the page count, deadline, academic level and type of paper. It is advisable to have this information at hand so that you can quickly fill in the necessary information needed in the form for the essay writer to be immediately assigned to your writing project. Make payment for the custom essay order to enable us to assign a suitable writer to your order. Payments are made through Paypal on a secured billing page. Finally, sit back and relax.
About Writedemy
We are a professional paper writing website. If you have searched a question and bumped into our website just know you are in the right place to get help in your coursework. We offer HIGH QUALITY & PLAGIARISM FREE Papers.
How It Works
To make an Order you only need to click on “Order Now” and we will direct you to our Order Page. Fill Our Order Form with all your assignment instructions. Select your deadline and pay for your paper. You will get it few hours before your set deadline.
Are there Discounts?
All new clients are eligible for 20% off in their first Order. Our payment method is safe and secure.