# Chemistry

posted by Nate

1). Calculate the initial and final pH when 5.0, 10.0, and 100mL of 0.100M HCL is added to
(a) 100mL of water
(b) 100mL of a buffer which is 1.50M acetic acid and 1.20M sodium acetate

2). Develop a recipe for making this buffer from acetic acid, sodium hydroxide, and water

1. DrBob222

(HCl) = 0.1M x 5 mL/105 mL = ?. Convert to pH.
10 mL and 100 mL are done the same way.

1b. millimols HCl added = 5 x 0.1 =0.5
mmols HAc = mL x M = about 150

.......Ac^- + H^+ ==> HAc
I......120....0........150
C.....-0.5..-0.5.......+0.5
E......119.5..0........150.5

Substitute the E line into the Henderson-Hasselbalch equation and solve for pH.
The 10 and 100 mL are done the same way.

2. Nate

Dr.Bob222, thank you for the assistance with 1a and 1b, however, I'm kind of confused with 2! What does recipe entail? A description? A series of calculations?

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