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8 May 2019

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 “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.

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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.

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.

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Irving HeathcoteLv2
8 May 2019

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