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WorksheetsACIDS BASES_End Lecture
Total questions: 10
Worksheet time: 5mins
According to the Arrhenius concept, an acid is a substance that can accept a pair of electrons to form a coordinate covalent bond
TRUE
FALSE
When sodium acetate is dissolved in water, the acetate ion behaves as a base
TRUE
FALSE
The larger the atom, the more stable a negative charge will be
TRUE
FALSE
The weaker the acid, the more stable its conjugate base.
TRUE
FALSE
Aspirin must be deprotonated (basic form) to be physiologically active.
TRUE
FALSE
Hydrochloric acid (HCl) is known as a strong acid. Which statement describes a strong acid after dissolving in solution?
few H+ ions: many acid molecules
many H+ ions; few acid molecules
Which of the following statements ARE TRUE about buffer solution?
(you may choose more than one answer)
pH of buffer solution will never change despite addition of small amount of base or acid
Buffer can be made by mixing weak acid and salt of its conjugate base or by mixing weak base with salt of its conjugate acid
Buffer has acid and base components that can work specifically to resist pH change
the closer the ratio of concentration weak acid/base to the concentration of salt of its conjugate base/acid, the less effective the buffer to resist pH change
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 takes place in the buffer system when blood is slightly more 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
Which of the following is a conjugate acid/base pair?
HCl/OCl-
H2SO4/SO42-
HPO42-/PO43-
H3O+/OH-
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
