3. Water

pH Scale

3. Water

pH Scale

Guided videos.

Learn with Jason

Additional 3 creators.

Learn with other creators

The pH scale | Acids and bases | AP Chemistry | Khan Academy

04:15

The pH scale | Acids and bases | AP Chemistry | Khan Academy

Chemistry: What is pH ; How to Calculate pH (3 examples) | Homework Tutor

pH Scale - BrainPOP video

pH and pOH: Crash Course Chemistry #30

Acids And Bases Salts And pH Level - What Are Acids Bases And Salts - What Is The pH Scale Explained

What Are Acids & Bases? | Chemistry Basics

American Chemical Society

991

views

rank

Showing 4 of 6 videos

Practice this topic

Multiple Choice

In a neutral solution, the concentration of __________.

a) Hydrogen ions is less than the concentration of hydroxide ions.

b) Water molecules is less than the concentration of hydroxide ions.

c) Hydrogen ions is greater than the concentration of hydroxide ions.

d) Hydrogen ions is equal to the concentration of hydroxide ions.

A base _______:

a) Has a value of 7 on the pH scale.

b) Is a chemical that donates hydrogen ions to a solution.

c) Is a chemical that accepts hydrogen ions from a solution.

d) Has a value below 7 on the pH scale.

e) None of the above are correct.

Which of the following statements about buffers is true?

a) They maintain a consistent pH only when acids are added to them, but not bases.

b) They maintain a consistent pH of 7.

c) They fluctuate in pH when acids are added to them.

d) They maintain a consistent pH when acids or bases are added to them.

e) They fluctuate in pH when acids or bases are added to them.

A substance that minimizes changes in the concentration of H⁺ and OH^– in a solution is a __________.

1089

views

Multiple Choice

A glass of grapefruit juice, at pH 3, contains __________ H⁺ as a glass of tomato juice, at pH 4.

1048

views

Multiple Choice

A solution at pH 6 contains __________ than the same amount of solution at pH 8.

1449

views

Textbook Question

Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? a. 4.0 M b. 10−10 M c. 10−4 M d. 104 M

1298

views

Textbook Question

What is the hydroxide ion concentration of the lake described in question 3? a. 10−10 M b. 10−4 M c. 10−7 M d. 10.0 M

882

views

Textbook Question

A solution at pH 6 contains _________ H+ than the same amount of a solution at pH 8. a. 20 times more b. 100 times more c. 2 times less d. 100 times less

1058

views

Textbook Question

A can of cola consists mostly of sugar dissolved in water, with some carbon dioxide gas that makes it fizzy and makes the pH less than 7. In chemical terms, you could say that cola is an aqueous solution where water is the _________ , sugar is a _________ , and carbon dioxide makes the solution _________ . a. solvent . . . solute . . . basic b. solute . . . solvent . . . basic c. solvent . . . solute . . . acidic d. solute . . . solvent . . . acidic

1353

views

Textbook Question

If you were given a solution that has a pH of 8.5, what would be its concentration of protons? What is the difference in proton concentration between this solution and one that has a pH of 7?

1138

views

Textbook Question

A recent experimental study looked at the combined effects of ocean acidification and increased ocean temperatures, both aspects of climate change, on the growth of polyps, juvenile coral animals. Researchers reported the average polyp biomass (in μg/polyp) after 42 days of growth under four treatments: a control with pH and temperature maintained close to normal reef conditions, a pH lowered by 0.2 units, a temperature raised by 1°C, and a combined lower pH and higher temperature. The results showed that polyp biomass was reduced somewhat in both the low-pH and high-temperature treatments, but the combined treatment resulted in a reduction in growth by almost a third—a statistically significant result. Experiments often look at the effects of changing one variable at a time, while keeping all other variables constant. Explain why this experiment considered two variables—both a higher temperature and a lower pH—at the same time.

1004

views

Textbook Question

Consider the reaction between carbon dioxide and water to form carbonic acid (CH2O3):

CO2(𝑔)+H2O(𝑙)⇌CH2O3(𝑎𝑞)

In the ocean, carbonic acid immediately dissociates to form a proton and bicarbonate ion, as follows:

CH2O3(𝑎𝑞)⇌CHO3−(𝑎𝑞)+H+(𝑎𝑞)

As atmospheric CO2 increases, the ocean absorbs more of the gas. Would this sequence of reactions be driven to the left or the right? How would this affect the pH of the ocean?

views

Open Question

Stony corals secrete thin layers of calcium carbonate (CaCO3) to build the foundation of coral reefs. The relationship between calcium carbonate, carbonic acid, and calcium bicarbonate (Ca(HCO3)2) is shown below:

CH2O3(𝑎𝑞)+CaCO3(𝑠) ⇌ Ca(HCO3)2(𝑎𝑞)

Predict what will happen to the calcium carbonate foundation of reefs as CO2 levels rise in the oceans.

views

Open Question

The current average pH of our oceans is 8.1. What is the concentration of protons in the oceans? How has the proton concentration changed in our oceans when compared to before the industrial revolution, when the average pH was 8.2? Express this change as a percentage increase.

views

Showing 4 of 15 practice