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dybincka [34]
3 years ago
12

Some students have said that a buffer is like a proton (H ) sponge. Evaluate this statement and explain both how a buffer is lik

e a sponge and how it is not like a sponge. For your explanation, include chemical equations, data, and create and explain molecular-level drawings. (Question is taken from Orgill and Sutherland, 2008.) (Saloni)
Chemistry
1 answer:
alisha [4.7K]3 years ago
8 0

Answer:

i)  Buffer absorbs  H^+ and OH^- ions preventing large changes in pH when small amounts of acid or base is added but when large amounts of acid or base is added there will be a change in pH

ii) absorption of liquid is related to a chemical reaction for a buffer system but it is not related a chemical reaction for a proton( H ) sponge.

Explanation:

<u>i) Buffer like a proton ( H ) sponge </u>

Buffer absorbs  H^+ and OH^- ions preventing large changes in pH when small amounts of acid or base is added but when large amounts of acid or base is added there will be a change in pH

The pH of a Buffer follows the Henderson-Hasselbach model

pH = pKa + Log ([A-]/[HA])

when base is added

HA + OH^-   -------> A- + H2O

when acid is added

A^- + H^+   ---------> HA

<u>ii) Buffer not like a proton ( H ) sponge</u>

absorption of liquid is related to a chemical reaction for a buffer system but it is not related a chemical reaction for a proton( H ) sponge.

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Finally, we have to add 4 more carbons in such a way that we only have a single signal. In this case the <u>ter-butyl group</u>.

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