ACIDS AND BASES QUIZ. Click to start. A. It is concentrated. B. It does dissociate in water. C. It almost completely dissociate in water. It absorbs water from the air. D. Question 1. Which one of the followig descriptions defines a strong acid?. Wrong Answer!.
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A strong acid is almost completely dissociated.
HA(aq) H+(aq) + A-(aq)
Metals react with acids to form hydrogen and salt.
strong acid < weak acid < weak base < strong base
The conjugate acid is formed by protonation of the amino group
A conjugate acid-base pair differ by a proton (H+)
Hydrogen chloride does not form ions in water.
Ethanol accepts hydrogen ions (protons) and water does not.
Magnesium is very soluble in ethanol but insoluble in water.
Water is a hydrogen ion/proton acceptor
Hydrogen chloride dissolved in water reacts with magnesium. Hydrogen chloride dissolved in ethanol does not react with magnesium. Which statement accounts for this observation?
Acid behaviour is observed in water since the water molecule is a strong base (proton acceptor) and forms hydronium ions, H3O+.
Benzenecarboxylic acid solution has a high concentration of ions.
Benzenecarboxylic acid is only slightly dissociated in water.
Benzenecarboxylic acid is completely dissociated in water.
It is a strong acid.
A dilute aqueous solution of benzenecarboxylic acid (an organic acid) is a poor conductor of electricity. Which of the following statements accounts for this observation?
The low concentration of ions accounts for its low conductivity.
A decrease in the H+ concentration and an increase in the OH- concentration.
An increase in the OH- concentration and an increase in the H+ concentration.
A decrease in the H+ concentration with no change in the OH- concentration.
An increase in the H+ concentration and a decrease in the OH- concentration.
A decrease in the pH of an aqueous solution corresponds to:
A decrease in pH correlates to an increase in the hydrogen ion concentration.
An increase by a factor of 2.
An increase by a factor of 100.
A decrease by a factor of 2.
A decrease by a factor of 100.
Calcium oxide is added to a lake to neutralise the effects of acid rain. The pH value of the lake water rises from 4 to 6. What is the change in concentration of [H+(aq)] in the lake water?
pH and [H+] are inversely related. An increase in the pH by a value of 1 corresponds to x10 decrease in the H+
HSO4- SO4- + H+
HSO4- + H+ H2SO4
A change in pH of 1 unit corresponds to a change of x10 in the concentration of hydrogen ions.
The sulfuric acid molecule is deprotonated.
H2SO4 + Ba(OH)2 BaSO4 + 2H2O
0.1 mol of sulfuric acid reacts with 0.1 mol of barium hydroxide.
Carbonic acid is a weak acid
A monoprotic acid releases 1 hydrogen ion per molecule in water.
The ammonia molecule has an available lone pair of electrons and is able to accept a hydrogen ion and form the ammonium ion (via a dative bond form).
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