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29 Apr 2019

Which of these statements is CORRECT?

Question 4 options:

1)

 Acids are substances that dissociate and release hydroxide.

2)

 Basic solutions consist of high amounts of hydrogen atoms

3)

 pH is a measure of nitrogen ion concentration.

4)

 pH 12 is basic.

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Lelia Lubowitz
Lelia LubowitzLv2
30 Apr 2019

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Related questions

(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?

SubmitHintsMy AnswersGive UpReview Part

Part B

What conditions must be met in order for an aqueous solution to be called “neutral”?

What conditions must be met in order for an aqueous solution to be called “neutral”?

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.

SubmitHintsMy AnswersGive UpReview Part

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.

SubmitHintsMy AnswersGive UpReview Part

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

SubmitHintsMy AnswersGive UpReview Part

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?

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 “neutral”?

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.

1. A polypeptide chain has a large percentage of acidic and basic amino acids in it. The R groups of these amino acids form ionic interactions, which helps the protein to maintain it’s structure. This particular polypeptide works well under an optimum pH of 7. Ignoring effects of strong acids and bases on peptide bonds, what will happen to the tertiary structure of the protein if you move it stomach acid, which has a pH of 1-2. Why? Be specific regarding what influence the pH will have on the bonds maintaining tertiary structure in the molecule. Include the amino acid charges of the acidic and basic amino acids at the acidic pH, as well as the concept of pK in your answer. Assume that acidic amino acids have a pK of approximately 4.7 and basic amino acids have a pK of approximately 10.

2. Ignoring peptide length (or lack thereof) where would this portion of a polypeptide be most likely to be found: On the inside or on the outside surface of a protein floating around in the cytoplasm? Explain

3. A mutation occurs in the SRC kinase such that the tyrosine on the loop over the active site is changed to aspartic acid. This mutation mimics phosphorylation.
a. knowing what you know about the properties of phosphate groups and aspartic acid, why does aspartic acid mimic phosphorylation?
b. What would be the implication of this mutation on the function of the SRC kinase?

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