3. Water

pH Scale

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

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

 No. The pH scale is a base-10 logarithmic scale. Each unit represents a tenfold increase or decrease in the hydrogen ion concentration. 

Consider the logarithmic nature of the pH scale.

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

Hydrogen ions is less than the concentration of hydroxide ions.

Water molecules is less than the concentration of hydroxide ions.

Hydrogen ions is greater than the concentration of hydroxide ions.

Hydrogen ions is equal to the concentration of hydroxide ions.

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.

Is a chemical that donates hydrogen ions to a solution.

Is a chemical that accepts hydrogen ions from a solution.

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.

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

They fluctuate in pH when acids are added to them.

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

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

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.

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

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

What Are Acids & Bases? | Chemistry Basics

pH Scale - BrainPOP video

Buffers

 No. Hydrophobic molecules are not soluble in aqueous solution, so they cannot donate or accept hydrogen ions or hydroxide ions from solution 

 No. NaCl (salt) dissociates in water, but the sodium cation and chloride anion cannot accept or donate hydrogen ions or hydroxide ions to the solution and, therefore, cannot maintain a relatively constant pH. 

No. Strong acids dissociate almost completely in water and increase the H+ concentration of the resulting solution; therefore, they reduce the pH.

How do organisms maintain pH levels?

A substance that minimizes changes in the concentration of H+ and OH&ndash; in a solution is a __________.

 No. Remember that the pH scale is logarithmic. 

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

Most mice living on the mainland of Florida are brown, but the mice that live on the sand dunes of the barrier islands have white fur. The differences in color are heritable, determined by genes such as MC1R. It is intuitive that the light color of beach-dwelling mice is an adaptation for blending into their environment—and thus evading predators.

Compare how evolution by inheritance of acquired characters and the theory of evolution by natural selection would explain the observation of white mice living primarily on light soil and brown mice living primarily on dark soil.

pH and pOH: Crash Course Chemistry #30

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

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Properties of Water- Density

Properties of Water- The Universal Solvent

Properties of Water- Cohesion and Adhesion

Introduction to Water

Acids and Bases

Properties of Water- Thermal

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