Bellwork 2 Week 3 4th Nine Weeks

The pH scale is a range from:

• 1-7

• 0-14

• 1-5

• 1-20

Water has a neutral because

• it has more H+ ions than OH-

• it has more OH- ions than H+

• it does not produce any ions

• it has an equal amount of H+ and OH- in solution

Substances that taste sour like lemon juice tend to be classified as

• Acids

• Bases

• Salts

• All

A substance that is a base has more OH- ions than H+ ions.

• True

• False

Which of the following is the weakest acid?

• bananas (pH 5)

• tomatoes (pH 4)

• cheese (pH 6)

• orange juice (pH 3)

What is the pH of a solution that has a [H⁺] of 2.5 x 10^-5?

• pH= - log[H⁺]

• pH + pOH = 14

• [H⁺] =10^-pH

• K_w= [H⁺] [OH^-]

What is the [H⁺] if the pH is 4.0?

• pH= -log[H⁺]

• [H⁺] =10^-pH

• pH + pOH =14  

• K_w= [H⁺][OH^-]

What is the pOH of a solution that has a pH of 2?

• pH= -log[H⁺]

• [H⁺]= 10^-pH

• pH + pOH =14

• K_w= [H⁺][OH^-]

What does a pH scale do?

• Tells you if a substance is an acid.

• Tells you if a substance is a base.

• Measures the strength or weakness of an acid or base.

• All of these are true.

What is the molarity of 1 mole of Ba⁺ in 2 L of water?

• 1 M

• 2 M

• .5 M

• .25 M