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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Annonn Annonn
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2 years ago
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_manbio_man
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#1
Educator
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2 years ago
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Annonn Author
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#2
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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#3
Educator
2 years ago
I've modified it
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Annonn Author
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#4
2 years ago
Thank you, that's what I got except I added an extra sig fig Slight Smile
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#5
Educator
2 years ago
Considering significant figures, it should only be 2 sf, thus 3.2 will suffice.
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