BIOL 1201 : Week 3
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(Choose all that are correct) Which of these statement(s) is/are correct about pH?
| The pH of a neutral solution is 7, which means that the concentration of the H+ ions is equal to the concentration of the OH- ions. |
| If a solution has 10-5 M/L OH- ions, the pH of the solution is 5 |
| If a solution has a pH of 8, the H+ concentration is less than the OH- concentration |
| In a water solution, the exponents of the H+ concentration and the OH- concentration must add up to 10. |
| If you know the pH, you can calculate the Hydrogen ion concentration |
| pH is defined as the concentration of Hydrogen ions |
Part A
Which answer is a true statement about pH values?
Part A
Which answer is a true statement about pH values?
Which answer is a true statement about pH values?
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Part B
What conditions must be met in order for an aqueous solution to be called âneutralâ?
What conditions must be met in order for an aqueous solution to be called âneutralâ?
| Pure water has a pH of 0. |
| pH is important in life mainly because it affects the cohesion of water. |
| A high pH corresponds to a high H+ concentration. |
| Stomach juice has a high pH. |
| None of the above. |
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Part C
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
| The hydronium ion concentration is greater than the hydroxide ion concentration. |
| The concentrations of hydronium and hydroxide ions are equal. |
| There are no hydronium or hydroxide ions present in the solution. |
| The hydroxide ion concentration is greater than the hydronium ion concentration. |
| None of the above. |
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Incorrect; One attempt remaining; Try Again
No, there's a power-of-ten relationship between the pH and the concentration. Maybe you should review the lesson.
Part D
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
| log (5) M |
| 105 M |
| 10-5 M |
| 5% |
| 5.0 M |
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Part E
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
| Cut it in half. |
| Double it. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| Raise it to 200 times its present value. |
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Part F
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
| Reduce it to 1/200 times its present value. |
| Double it. |
| Cut it in half. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| 10-5 M |
| 10-9 M |
| 10-1 M |
| 5 M |
| Can't tell without more information. |
Part B
What conditions must be met in order for an aqueous solution to be called âneutralâ?
| Pure water has a pH of 0. |
| pH is important in life mainly because it affects the cohesion of water. |
| A high pH corresponds to a high H+ concentration. |
| Stomach juice has a high pH. |
| None of the above. |
Part C
Factory smoke has led to acid rain that lowered the pH of a lake to 5.0. What is the H+ concentration in the lake?
| The hydronium ion concentration is greater than the hydroxide ion concentration. |
| The concentrations of hydronium and hydroxide ions are equal. |
| There are no hydronium or hydroxide ions present in the solution. |
| The hydroxide ion concentration is greater than the hydronium ion concentration. |
| None of the above. |
Your tank of swamp fish needs a pH of 5, and the pH is 7 at present. What should you do to the H+ concentration?
| log (5) M |
| 105 M |
| 10-5 M |
| 5% |
| 5.0 M |
Part E
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
In a washing machine, the detergent raised the pH to 9.0. The concentration of OH- in the solution is ...
| Cut it in half. |
| Double it. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| Raise it to 200 times its present value. |
SubmitHintsMy AnswersGive UpReview Part
Part F
Your tank of alkali fish needs a pH of 8, and the pH is 6 at present. What should you do to the H+ concentration?
| Reduce it to 1/200 times its present value. |
| Double it. |
| Cut it in half. |
| Reduce it to 1/100 of its present value. |
| Raise it to 100 times its present value. |
| 10-5 M |
| 10-9 M |
| 10-1 M |
| 5 M |
| Can't tell without more information. |
Life Chemistry LabReport
- Elements of Living Organisms
- Name the five most abundant elements found in the humanbody.
- Cells organize into tissues which work together to form
- What is the difference between an atom and an element?
- Molecules
- Is glucose an atom or molecule? What are the atoms inglucose?
- How many bonds can oxygen form?
- Is C6H12O6 a molecular orstructural formula? What is the name of this molecule?
- Based on lab, Section II, draw and label a ball and stickrepresentation of a carbon dioxide, water and ethyl alcoholmolecule. Use circles to designate atoms and lines for bonds, thenindicate the chemical symbol for each atom. Sign, date and preparean image of your drawing and include it with this lab report.
- Molecular Make Up of Living Organisms
- Name the four groups of organic molecules.
- _______ are the most abundant organic molecules in livingorganisms.
- Name a polysaccharide, monosaccharide, protein and alipid.
- Go to the lab, Section 3, Exercises 2, 3, 4 and 5 to completethe following table:
Type of Organic Molecule | Reagent | Sample Tested | Positive Color | Negative Color |
Carbohydrate (starch) | Iodine | |||
Sugar | Benedictâs solution | |||
Lipid (fat) | Sudan IV | |||
Protein | Biuret |
- Go to the lab, Section 3, Exercise 6 to locate starch in potatocells. Describe the microscopic appearance of starch in terms ofcolor and location within the cells.
- Measurement of pH
- What substance has an equal number of hydrogen ions(H+) and hydroxide ions (OH-)?
- What is the pH of the above substance?
- How does the addition of hydroxide ions (OH-) affectthe pH of your stomach?
- Go to lab, Section 4, Exercise 7 to test the pH of commonsolutions. Which solution tested had a pH closest to neutral? Whichsolution was most acidic?
Summary Questions
- What is the smallest subunit of carbohydrates?
- Which reagent could be used to test for diabetes?
- A member of your family has a high blood cholesterol count. Yousee âfat freeâ crackers in the grocery store and decide to test theproduct for the presence of lipids. How would this testproceed?
- A family member has been cautioned about eating foods high insugar. Explain how a test could be run for the presence ofsugar.
- Explain how to test for the presence of protein in milk.
- A friend complains of stomach acidity. Which substance testedmight safely help relieve your friendâs symptoms?
- Explain how solutions are classified as acids or bases. Then,give an example of a weak acid.
