Cathy’s favorite salad dressing is a liquid with particles of salt, pepper, and garlic. When comparing a spoonful of salad dress
2 answers:
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Answer:
Explanation:
Kₐ and pKₐ are measures of the strength of an acid. For example,
HX + H₂O ⇌ H₃O⁺ + X⁻; Kₐ = 10¹⁰, pKₐ = -10
HA + H₂O ⇌ H₃O⁺ + A⁻; Kₐ = 10⁻¹⁰, pKₐ = 10
HX is a strong acid, because it has a larger Kₐ, that is, the position of equilibrium lies far to the right.
However, pKₐ is the negative logarithm of Kₐ, so HX has the smaller pKₐ.
Similarly, Ha is a weak acid, but it has the larger pKₐ.
Strong acid: Large Kₐ ⇔ Low pKₐ
Weak acid: Small Kₐ ⇔ High pKₐ
A is wrong. HA is a weak acid, so it produces only a few hydronium ions.
B is correct. The rate of corrosion depends on the concentration of hydronium ions. HA is a weak acid, so it is less corrosive than an acid with a small pKₐ.
C is wrong. HX is a strong acid, so there are more ions to carry the current. HX will be a good conductor of electricity.
D is wrong. HX is a strong acid, so it provides more hydronium ions and is more corrosive.
E is wrong. HX is a strong acid, so it provides more hydronium ions to stimulate the taste buds.
0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 but a 0.010 M solution of acetic acid, HCH₃COO, is 3.37 is because HCl dissociates more.
<h3>Dissociation</h3>This is the separation of ions of an ionic compound when it dissolves.
<h3>Hydrogen ion concentration of HCl</h3>Since 0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 its hydrogen ion concentration is gotten from
pH = -log[H⁺]
So,
So, [H⁺] = 10⁻²
<h3>Hydrogen ion concentration of HCH₃COO</h3>Also, since 0.010 M solution of acetic acid, HCH₃COO, has a pH of 3.37, its hydrogen ion concentration is gotten from
pH = -log[H⁺]
So,
So, [H⁺] = 10⁻³°³⁷ = 0.000427 = 4.27 × 10⁻⁴
Since the hydrogen ion concentration of HCl is 10⁻² and the hydrogen ion concentration of HCH₃COO is 4.27 × 10⁻⁴, we see that HCl dissociates more than HCH₃COO.
So, 0.010 M solution of hydrochloric acid, HCl has a pH of 2.00 but a 0.010 M solution of acetic acid, HCH₃COO, is 3.37 is because HCl dissociates more.
Learn more about dissociation here: