Lecture 4: Acids and Bases Flashcards
The behavior of acids and bases are described by two theories
- Arrhenius Theory
- Bronsted Lowry Theory
substances that produce hydrogen ions (H+) in aqueous solution
ACIDS
substances that produce hydroxide ions (OH- ) in aqueous solutions
BASES
THEORY: acids are proton (H+ ) donors while bases are proton acceptors
BRONSTED LOWRY THEORY
are proton (H+ ) donors
Acids
are proton acceptors
Bases
Acid-base reactions possess
conjugate pairs
Conjugate pairs are ______ in strength
opposite
is the scale that indicates the acidity or basicity (alkalinity) of a solution
pH
pH is determined by the amount of
hydronium ions (H3O+ ) present
Basic solutions contain
hydroxide ions (OH-)
pH low
acidic
pH high
basic
is the process where bonds in molecules and in ionic compounds split into ions
Dissociation
Strong acids and bases dissociate _______
completely
Weak acids and bases dissociate
partially
Double arrows also indicate that a chemical reaction is in a state of
chemical equilibrium
There are different methods in determining the pH of a solution or substance
- pH paper
- pH indicators
- pH meter
Cannot fully determine the exact level or in between
pH paper
Cannot be used in highly colored liquids
pH indicators
Most accurate and most expensive
pH meter
The pH of blood and other body fluids is maintained by the body in a range between
7.35 to 7.45
imbalance in metabolic or respiratory processes
physiological pH
A drop in normal pH is referred to as
acidosis
a rise in normal pH is referred to as
alkalosis
Acidosis or alkalosis is further described as ________ if the pH change is caused by problems in the process of gas exchanges
respiratory
pH when dissolved in water:
Acid - Strong
Base - Strong
Salt - Neutral
7
pH when dissolved in water:
Acid - Strong
Base - Weak
Salt - Acidic
<7
pH when dissolved in water:
Acid - Weak
Base - Strong
Salt - Basic
> 7
THEORY: Describes ACIDS as substances that produce hydrogen ions (H+) in aqueous solution and BASES as substances that produce hydroxide ions (OH- ) in aqueous solutions
Arrhenius Theory