Question

You have the following reagents on hand:

Solids ( of Acid Form is Given)	Solutions
Benzoic acid (4.19)	5.0 M HCl
Sodium acetate (4.74)	1.0 M acetic acid (4.74)
Potassium fluoride (3.14)	2.6 M NaOH
Ammonium chloride (9.26)	1.0 M HOCl (7.46)

What combinations of reagents would you use to prepare buffers at the following pH values?

1. 3.0

   Choose two.

   benzoic acid
   sodium acetate
   potassium fluoride
   ammonium chloride
   5.0M HCl
   1.0M acetic acid
   2.6M NaOH
   1.0M HOCl

2. 4.0

   Choose two.

   benzoic acid
   sodium acetate
   potassium fluoride
   ammonium chloride
   5.0M HCl
   1.0M acetic acid
   2.6M NaOH
   1.0M HOCl

3. 5.0

   Choose two.

   benzoic acid
   sodium acetate
   potassium fluoride
   ammonium chloride
   5.0M HCl
   1.0M acetic acid
   2.6M NaOH
   1.0M HOCl

4. 7.0

   Choose four.

   benzoic acid
   sodium acetate
   potassium fluoride
   ammonium chloride
   5.0M HCl
   1.0M acetic acid
   2.6M NaOH
   1.0M HOCl

5. 9.0

   Choose two.

   benzoic acid
   sodium acetate
   potassium fluoride
   ammonium chloride
   5.0M HCl
   1.0M acetic acid
   2.6M NaOH
   1.0M HOCl

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