3 years ago

The name given to the Earth's climate when there was no ice at the poles

Chemistry

1 answer:

Citrus2011 [14]3 years ago

7 0

Answer:

i think snowball, it sounds weird but its true (i think im sorry if its wrong)

Explanation:

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Calculate the Ka for a 0.3 M solution of HA (unknown weak acid) if the pH = 3.65. The reaction can be modelled as HA (aq) + H2O

Levart [38]

The Ka : 1.671 x 10⁻⁷

<h3>Further explanation</h3>

Given

Reaction

HA (aq) + H2O (l) ←→ A- (aq) + H3O+ (aq).

0.3 M HA

pH = 3.65

Required

Solution

pH = - log [H3O+]

$\tt [H_3O^+]=10^{-3.65}=2.239\times 10^{-4}$

ICE method :

HA (aq) ←→ A- (aq) + H3O+ (aq).

0.3 0 0

2.239.10⁻⁴ 2.239.10⁻⁴ 2.239.10⁻⁴

0.3-2.239.10⁻⁴ 2.239.10⁻⁴ 2.239.10⁻⁴

$\tt Ka=\dfrac{[H_3O^+][A^-]}{[HA]}\\\\Ka=\dfrac{(2.239.10^{-4}){^2}}{0.3-2.239.10^{-4}}\\\\Ka=1.671\times 10^{-7}$

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