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Sliva [168]
3 years ago
12

Check all items common to bases:

Chemistry
2 answers:
amm18123 years ago
4 0

Answer:

The correct answer is "e= -OH"

Explanation:

Hello! Let's solve this!

A substance that is a base has -OH

According to Arrhenius, a base is a substance that gives -OH to the medium.

An acid, according to Arrehnius, is a substance that can accept protons (H +)

The correct answer is "e= -OH"

Leona [35]3 years ago
3 0
The common to bases is
<span>e-OH-
according to the characteristics of Arrhenius bases.

An Arrhenius base is a substance that produces OH- or hydroxide ions when dissolved in water. An Arrhenius acid, on the other hand, produces H+ ions when dissolved in water.</span>
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To understand the relation between the strength of an acid or a base and its pKa and pKb values. The degree to which a weak acid
elena-14-01-66 [18.8K]

Answer:

pKa = 3.675

Explanation:

  • pKa = - Log Ka

∴ <em>C</em> X-281 = 0.079 M

∴ pH = 2.40

let X-281 a weak acid ( HA ):

∴ HA ↔ H+ + A-

⇒ Ka = [H+] * [A-] / [HA]

mass balance:

⇒<em> C</em> HA = 0.079 M = [HA] + [A-]

⇒ [HA] = 0.079 - [A-]

charge balance:

⇒ [H+] = [A-] + [OH-]... [OH-] is negligible; it comes from to water

⇒ [H+] = [A-]

∴ pH = - log [H+] = 2.40

⇒ [H+] = 3.981 E-3 M

replacing in Ka:

⇒ Ka = [H+]² / ( 0.079 - [H+] )

⇒ Ka = ( 3.981 E-3 )² / ( 0.079 - 3.981 E-3 )

⇒ Ka = 2.113 E-4

⇒ pKa = - Log ( 2.113 E-4 )

⇒ pKa = 3.675

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Answer:

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