Acid-Base Flashcards
(31 cards)
comparison of ice and water
ice: ___ hydrogen bonds per water molecule
water: ___ hydrogen bonds per water molecule
ice: hydrogen lifetime is about _____
water: hydrogen lifetime -a bout _____
4
2.3
10 microsecs
10 psecs
Ionization of Water
1) O-H bonds are ____ and can dissociate heterolyrtically
2) products are a ______ and a ____
3) dissociation of water is a rapid ______ process
4) most water molecules remain ______, thus pure water has very low ________
5) the equilibrium is strongly to the ____
6) extent of dissociation depends on the ________
polar proton (H+) and a hydroxide ion (OH-) reversible un-ionized, electrical conductivity left temperature
in pure water, the chemical concentration of H+ and OH- are ____. because of the very small degree of _____ we can write the chemical concentration of water as _____, which is its non-dissociated concentration at 25 degrees C
equal
dissociation
55.5 M
the negative logarithm of the hydrogen ion concentration
pH
when the [H+] is > than [OH-] the solution is said to be _______
when [OH-] and [H+] are equal, the solution is said to be ______
when [H+] is
acidic
neutral
basic
the pH of our plasma is _____
the pH of our gastric juices is ____
7.4
1-2
_____ is a digestive enzyme secreted into gastric juice, which has a pH of ____, allowing it to act optimally
pepsin, 1.5
_____ a digestive enzyme that acts in the small intestine, has a pH optimum that matches the neutral pH in the lumen of the small intestine
trypsin
______ of bone tissue is a hydrolytic enzyme thought to aid in bone mineralization
alkaline phosphatase
a substance that contains hydrogen and dissociates in water to contain ____
acid
H+
substance that contains a hydroxyl group dissociates in water to yield ____
base
OH-
any species that donates an H+
bronsted lowry definition of acid
any species that accepts an H+ ion
bronsted lowry definition of a base
oxoacids where the number of oxygens ___ the number of hydrogens by ____,
ex: ____, _____
strong acid
exceeds
2 or more
HNO3, H2SO4
hadrohalic acids
strong acid
HCl, HBr, HI
(carbon-based) include at least one COOH group
weak acid
organic acids
oxoacids where the number of oxygens _____ or ______ the number of hydrogens
ex)
weak acid
equals, exceeds
HNO2, H3PO4
Ka is _____ over ______, the stronger acids will have at equilibrium, a _______ of the dissociation products compared to the undissociated acid
products, reactants
higher proportion
higher Ka means ______
stronger acid
larger the pKa, the _____ the acid
weaker
describes the dissociation of a weak acid in the presence of its conjugate base
Henderson-Hasselbalch equation
analytical method used to determine the amount of acid in a solution
titration
at incremental points along the titration process, the pH of the solution is determined and plotted against the OH- amount added
this is called the ______
titration curve
the dissociation of the weak acid is ________ to the molar equivalents of strong base added
proportional
