11. Covalent bonding (with an electronegativity difference below 0.5) results when fluorine bonds with A. iodine.
2 answers:
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The given question is incomplete. The complete question is:
An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.
>
M, pH < 7.00
<
, pH < 7.00
<
,, pH > 7.00
>
,, pH > 7.00
Answer: >
M, pH < 7.00
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.
As pH of acids is less than 7, the hydronium ion concentration is greater than
Thus the correct option is >
M, pH < 7.00
Answer:
The percentage of amine is protonated is 63,07%
Explanation:
The reaction of an amine RNH₃ (weak base) with water is:
RNH₃ + H₂O ⇄ RNH₄⁺ + OH⁻
The kb is defined as:
As kb = 4,004x10⁻⁵ and [OH⁻] is :
1,708 = [RNH₄⁺] / [RNH₃] <em>(1)</em>
As the total amine is a 100%:
[RNH₄⁺] + [RNH₃] = 100% <em>(2)</em>
Replacing (1) in (2):
1,708 [RNH₃]+ [RNH₃] = 100%
2,708 [RNH₃] = 100%
[RNH₃] = 36,93%
Thus,
<em> [RNH₄⁺] = 63,07%</em>
The percentage of amine protonated is 63,07%
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