Hydrogen Ions and Acidity

When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

• increases by 1

• increases by 10

• decreases by 1

• decreases by 10

What is the pH of a solution that has a hydronium ion concentration 100 times greater than a solution with a pH of 4?

• 5

• 2

• 3

• 6

As an acidic solution is added to a basic solution, the pH of the basic solution

• decreases

• increases

• remains the same

Solution A has a pH of 3 and solution Z has a pH of 6. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution Z?

• 100

• 3

• 2

• 1000

Adding 0.1 M NaOH to a 0.1 M solution of HCl will cause the pH of the solution to

• decrease

• increase

• remain the same

When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the solution

• decreases by a factor of 10

• increases by a factor of 10

• decreases by a factor of 100

• increases by a factor of 100

. As the pH of a solution is changed from 3 to 6, the concentration of hydronium ions

• increases by a factor of 3

• increases by a factor of 1000

• decreases by a factor of 3

• decreases by a factor of 1000

What is the color of bromcresol green indicator in a solution with a pH value of 2.0?

• blue

• green

• red

• yellow

The acidity or alkalinity of an unknown aqueous solution is indicated by its

• pH value

• electronegativity value

• percent by mass concentration

• percent by volume concentration

As HCl(g) is added to water, the pH of the water solution

• decreases

• increases

• remains the same