PL - Equilibria (acid–base) *01 *02 Flashcards

1
Q

carboxylic acids - functional group

A

contain the carboxyl group (-COOH)

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2
Q

dicarboxylic acid - functional groups

A

contain two carboxyl groups at either end of the molecule

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3
Q

carboxylic acids - strong or weak acids

A

weak acids

they partially dissociate into carboxylate ions (R-COO-) and H+

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4
Q

carboxylic acids - reaction with metals

A

react with more reactive metals in a redox reaction to form a salt and hydrogen gas

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5
Q

carboxylic acids - reaction with carbonates (CO3^2-)

A

reacts with carbonates to form a salt, carbon dioxide and water

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6
Q

carboxylic acids - reactions with aqueous alkalis

A

react with aqueous alkalis to form salts and water

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7
Q

PAG 7

A
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8
Q

what can amino acids exist as ?

A

zwitterions

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9
Q

what is a zwitterion?

A

an overall neutral molecule that has both a +ve and -ve charged in different parts of the molecule

can only exist as a zwitterion near its isoelectric point - the pH where the overall charge on the amino acid is zero, this depends on the R-group.

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10
Q

structure of zwitterions - in conditions more acidic than isoelectric point

A

H3N+ - CH(R) - COOH

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11
Q

structure of zwitterions - in conditions more basic than isoelectric point

A

H2N - CH(R) - COO-

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12
Q

structure of zwitterions - at isoelectric point

A

H3N+ - CH(R) - COO-

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13
Q

amino acids - amino (amine) group nature

A

basic because the lone pair on the nitrogen (NH2), can accept a H+ ion to give N+H3

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14
Q

how do amino acids react

A

the amino group of one amino acid reacts with the carboxyl group of another

forms a peptide link

condenstation reaction to make

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