Posted by Anonymous on Sunday, March 4, 2012 at 7:24pm.
Don't get lazy in chemistry. You see what difference there is between a 1m and a 1M solution. By the same token, Hf means heat formation and not HF which I assume you mean hydrofluoric acid. hcl and Naf mean nothing. Start your sentences with a capital letter. To your credit I can tell where the sentences end because you used a period.
100 mL x 0.2M NaF = 20 millimoles.
100 mL x 0.2M HF = 20 mmoles.
4.0mL x 1.0M HCl = 4 mmoles.
.........F^- + H^+ ==> HF
initial..20.....0......20
add............4.0.........
change..-4.0..-4.0....+4.0
equil...16.0...0......4.0
Use the Henderson-Hasselbalch equation, Substitute the equilibrium line from the ICE chart above and solve for pH.
Post your work if you need additional help.
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