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April 18, 2014

Homework Help: Chemistry

Posted by Lorenzo on Saturday, December 8, 2012 at 2:54pm.

TRUE OR FALSE?

1) A solution that is made out of 1.00mol/L ammonia and 0.50mol/L of ammonium chloride is a basic buffer.

2) The pH at the equivalence point of a weak base with a strong acid is expected to be less than 7 because the acid that is added is very strong

3) The pH of a buffer solution made out of 0.20mol/L hydrofluoric acid and 0.30mol/L sodiumfluoride is the same as a buffer solution that is made out of 0.10mol/L of acetic acid and 0.15mol/L of sodium acetate.

4) One cannot prepare a buffer from a strong acid and its conjugated base, because a conjugated base of a strong acid cannot buffer; meaning cannot react in the reverse direction of the acid dissociation.

5) The pH at the equivalence point of a weak base with a strong acid is expected to be less than 7 because of the presentce of the conjugated acid in the water.

6) You cannot prepare a buffer from nitric acid and sodium nitrate, but you can make one from nitrous acid and potassium nitrite

7) A solution that is made out of 1.00mol/L ammonia and 0.05mol/L of ammonium chloide can act as a basic buffer.

8) You cannot prepare a buffer with a pH of 11.5 with trimethylamine and trimethylammonium chloride

9) The capacity of a buffer solution made out of 0.20mol/L hydrofluoric acid and 0.30mol/L sodiumfluoride is the higher than that of a buffer solution made out of 0.10mol/L of hydrofluoric acid and 0.15mol/L of sodiumfluoride. But the pH of the two buffers solutions is the same.

I thought it was: true, false, false, true, true true, true, false, false, but it was not the good answer. I've been stuck on this for a looong time, help please!

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