Monday
December 22, 2014

Posts by Angelyka


Total # Posts: 6

Chemistry
Consider the titration of 25.00 mL of 0.08364 M pyridine (see structure below) with 0.1067 M HCl. Find the pH at the following acid volumes (Va): 4.63 mL, Ve, and 25.0 mL. pKa = 11.3 I got 11.81, 6.63, and 1.74 respectively. Yet, the last two are incorrect and I am unsure what...
March 4, 2013

Chemistry
Glutamic acid is triprotic amino acid with pKa values of 2.23, 4.42, and 9.95. You are given a 0.100 M solution of it in its fully protonated form (H3A). How many moles of KOH must be added to 100 mL of this solution to make a solution with a pH of 5.00. I used 2.23 as the pka...
March 2, 2013

Chemistry
Thank you. I think I understand how to set it up.
January 24, 2013

Chemistry
Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to Ca10(PO4)6(OH)2(s) --> 10Ca2+(aq) + 6PO43-(aq) + 2OH-(aq) Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the ...
January 24, 2013

chemistry
Thank you so much. I went back to my notes where I was trying to work it out. I did mess up with the common ion. Ag2+. It was set up pretty much just as you had it. Thanks again.
January 24, 2013

chemistry
What is the silver ion concentration in a solution prepared by mixing 385 mL of 0.380 M silver nitrate with 467 mL of 0.409 M sodium chromate? The Ksp of silver chromate is 1.2 × 10-12 I ended up making Ag+ = 2x. = 1.3 x10^-4 Which is incorrect so I'm not sure how to...
January 24, 2013

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