Acids and Bases I: Definitions, pH and Neutralization

A hydrogen ion, H+, is the same as a(n):

• a.neutron
• b.electron
• c.proton
• d.hyrdoxide ion

Acidic foods can be identified by what taste?

• a.salty
• b.sour
• c.bitter
• d.sweet

OH- is called the:

• a.hydrate ion
• b.hydrogen ion
• c.hydronium ion
• d.hydroxide ion

Acids increase the concentration of what in water?

• a.H+ ions
• b.hydrate ions
• c.hydroxide ions
• d.OH- ions

According to the Brønsted-Lowry definition, bases are defined as:

• a.Molecules that dissociate to release OH- ions
• b.proton acceptors
• c.proton donors
• d.Molecules that dissociate to release protons

What is the concentration of H+ in pure water?

• a.1 x 10^-13 moles/liter
• b.1 x 10^-14 moles/liter
• c.1 x 10^-7 moles/liter
• d.1 x 10⁷ moles/liter

A solution with a pH of 11 has a H+ concentration of:

• a.1 x 10^-11 moles/liter
• b.1 x 10^-3 moles/liter
• c.1 x 10¹¹ moles/liter
• d.1 x 10³ moles/liter

Which substance has the lowest pH?

• a.milk
• b.NaOH
• c.pure water
• d.lemon juice

An unknown substance is added to a solution and the pH increases. The substance is:

• a.an acid
• b.a base
• c.a solvent
• d.sweet

You have a beaker containing 500 mL of a strong base, and you titrate it with 1M HCl until your pH 7 indicator just turns color, and then stop. The solution:

• a.Has become acidic
• b.Has been diluted
• c.Has been neutralized
• d.Will continue to change color

In the titration above, the color change happens after you’ve added 250 ml of the 1M HCl. What is the molarity of the strong base?

• a.1.00 M
• b..0500 M
• c.0.250 M
• d.0.125 M