WorksheetsBuffers
Total questions: 38
Worksheet time: 41mins
An acid has a pH
higher than 7
lower than 7
7
greater than 14
the H in pH stands for
hood
happy
hydrogen
help
a base has a pH of
lower than 7
higher than 7
7
it only has a pOH
lemon juice is a
acid
base
the more H+ ions the
stronger the acid
weaker the acid
it neutralizes
bleach is
an acid
a base
what did we use to test the pH
litmus paper
licking paper
diabetic test strips
if you add an acid to a base what will happen?
BOOM
it will neutralize
it wont mix
What might happen if buffers did not exist within the human body?
Our blood and other bodily fluids might become too acidic or basic.
Our stomach acid would not be able to break down food.
We would not be able to process glucose within our cells.
We would not be able to inhale oxygen into our lungs.
Why would a potato have a buffering system?
To survive if its environment changes
To vary the pH according to the environment
To keep the pH of the potato low
To keep the pH very acidic
Why were the biological samples generally good buffers?
Water is a poor buffer
They need to maintain a pH of 8.0 at all times
All living organisms need to maintain homeostasis in terms of pH
The samples came in liquid form
If some process releases acid [H+] into the blood, this equilibrium responds by shifting to the left as long as there is HCO3-present for the H+ to react with, thus removing the excess H+ions. What happens after the release of H+?
pH never lowers
pH is lowered and then immediately restored
pH raises and then is restored
ph lowers and remains low
If a process releases base into the blood, which would react with and lower the concentration of the H+, the equilibrium shifts to the right as long as there is H2CO3, thus replacing the lost H+ions. To protect against added base, what needs to be in relatively high amounts?
HCO3-
OH-
H+
H2CO3
The alkaline diet is good for those who need to balance their pH. Do you need to balance your pH?
No. There is a natural buffer system already in my blood that balances my pH.
Yes. This will lead to a better mood.
Compare the food you should and should not eat on the alkaline diet. Why MIGHT somebody on the diet actually lose weight?
Adding more fruits and veggies
Reducing red meat
Reducing sugary sodas
All of the above
Two beakers have liquids in them. When you add a base such as ammonia to beaker 1, the pH did not change. But when you add ammonia to beaker 2, the pH changes drastically. Choose the best explanation.
Beaker 1 had only water and Beaker 2 contained a buffer.
Beaker 1 contained a buffer and Beaker 2 contained only water.
Beaker 2 contained an acid.
The beaker that changed pH contained a buffer.
Mixtures that would be considered buffers include which of the following?
I. 0.10 M HCl + 0.10 M NaCl
II. 0.10 M HF + 0.10 M NaF
III. 0.10 M HNO3 + 0.10 M NaNO3
I only
II only
III only
II and III
Which of the following reactions shows what happens when nitric acid is added to an ammonia /ammonium ion buffer?
H+ + NH3 ⇌ NH4+
H+ + NH4+ ⇌ NH52+
NO3- + NH3 ⇌ NH3NO3
NO3- + NH4 ⇌ NH4NO3
The buffer solution is able to maintain pH by some events, except . . .
The addition of a little acid
The addition of a little base
Dilution
Addition of water
The addition of excess acid
a buffer solution is made by mixing HA, a weak acid, with salts containing A- ions.
HA ↔ H+ + A-
a formula that can be used for the calculation of the pH of this buffer solution is
Equilibrium reaction of carbon dioxide (CO2) and hydrogencarbonate (HCO3-) ions in blood is one of the important buffer system that contribute to stabilise pH of the blood
CO2(aq) + H2O(l) ↔ H+(aq) + HCO3-
Which one take place on the buffer system when blood are slightly acidic than it would be normally ?
equilibrium of the buffer system shifts to the right
more hydrogencarbonate (HCO3-) ions are consumed in reaction with excess acid to produce more dissolved CO2
more dissolved CO2 are consumed from the blood to remove excess acid and produce more hydrogencarbonate (HCO3-) ions
No shift of the equilibrium take place on the buffer system
