EASY CHEM QUESTION! WILL BEST ANSWER!

label Chemistry
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Apr 25th, 2015

1) milimoles of (H+) produced from HCl = volume*molarity = 40*0.1= 4 mili moles

2) ( OH-) added to reach equivalence point = 40 ml*0.1=4 milimoles

3) Total amount of (OH-) added after equivalence point to make 100ml solution = 100-(40+40) =20 ml

Thus milli moles of (OH-) added after equivalence = 20*0.1 = 2 milli moles

4) At equivalence point, [OH(-)] aq = 10^(-7) M

5) At 120 ml total volume, excess [OH(-)] aq (not neutralized) = 120-80 = 40 ml

Hence concentration [OH(-)] aq= moles/volume = 4/120 = 0.03 M

6) pH = 13(nearby)

7)It turns colorless in acidic solutions and pink in basic solutions. So, the titration is complete when a pink colour is observed. pH range for colour change of Phenolphthalein is 8-9.8.

Apr 25th, 2015

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