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Use the Henderson-Hasselbalch equation to perform the following calculations.

Annonn

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2 years ago

Use the Henderson-Hasselbalch equation to perform the following calculations.

Use the Henderson-Hasselbalch equation to perform the following calculations.
The Ka of acetic acid is: 1.8 × 10–5. FW for sodium acetate, trihydrate (NaC2H3O2•3H2O) is 136.08 g/mol.

• Buffer A: Calculate the mass of solid sodium acetate required to mix with 50.0 mL of
0.1 M acetic acid to prepare a pH 4 buffer.

• Buffer B: Calculate the mass of solid sodium acetate required to mix with 50.0 mL of
1.0 M acetic acid to prepare a pH 4 buffer.

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bio_man

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Annonn Author

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2 years ago

So, I tried replicating it for Buffer B, since there is 1.0 M of acetic acid, and all the numbers are the same, wouldn't the answer be 3.321 g?
I noticed Buffer B's answer is similar to Buffer A's answer, but with the decimal moving to the right, once.

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bio_man

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2 years ago

I've modified it

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Annonn Author

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2 years ago

Thank you, that's what I got except I added an extra sig fig Slight Smile

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bio_man

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2 years ago

Considering significant figures, it should only be 2 sf, thus 3.2 will suffice.

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