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aliina [53]
3 years ago
12

Explain the difference between C18H27NO3, salad dressing and the air you are breathing.

Chemistry
1 answer:
Vika [28.1K]3 years ago
5 0

Answer:

C_{18}H_{27}NO_3 is a compound.

Salad dressing is a heterogeneous mixture.

Air is a gaseous homogeneous mixture.

Explanation:

Hello,

At first, C_{18}H_{27}NO_3 is named as Capsaicin and is the active component of the chili peppers. It is an organic molecule (compound) containing carbon, hydrogen, nitrogen and oxygen which produces a sensation of burning in any tissue with which it comes into contact.

Secondly, salad dressings are combinations of several ingredients that are available to be used with other types of foods. Those ingredients characterizes the salad dressing as a heterogeneous mixture composed by liquid and solid constituents.

Finally, the air we are breathing is a gaseous homogeneous mixture majorly composed by 79% of nitrogen and 21% oxygen.

Best regards.

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Phosphoric acid is a polyprotic acid, with p K values of 2.14, 6.86, and 12.38. Which ionic form predominates at pH 9.3
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HPO₄⁻² predominates at pH 9.3

Explanation:

These are the equilibriums of the phosphoric acid, a tryprotic acid where 3 protons (H⁺) are realesed.

H₃PO₄ + H₂O   ⇄   H₂PO₄⁻   +   H₃O⁺   pKa 2.14

H₂PO₄⁻  +  H₂O   ⇄   HPO₄⁻²  +  H₃O⁺  pKa 6.86

HPO₄⁻²  +  H₂O   ⇄   PO₄⁻³   +   H₃O⁺  pKa 12.38

The H₂PO₄⁻  works as amphoterous, it can be a base and acid, according to these equilibriums.

H₂PO₄⁻ +  H₂O   ⇄   HPO₄⁻²  +  H₃O⁺

H₂PO₄⁻ +  H₂O   ⇄   H₃PO₄  +  OH⁻

pH 9.3 is located between 6.86 and 12.38 where we have this buffer system HPO₄⁻² / PO₄⁻³, where the HPO₄⁻² is another amphoterous:

HPO₄⁻ +  H₂O   ⇄   H₂PO₄⁻  +  OH⁻

HPO₄⁻²  +  H₂O   ⇄   PO₄⁻³   +   H₃O⁺

The media from the two pKa, indicates the pH where the protonated form is in the same quantity as the unpronated form, so:

(6.86 + 12.38) /2 =  9.62

Above this pH, [PO₄⁻³] > [HPO₄⁻²].

In conclussion, at pH 9.3, [HPO₄⁻²] > [PO₄⁻³]

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