Friday
March 27, 2015

Homework Help: chemistry

Posted by John on Wednesday, April 6, 2011 at 9:48pm.

The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL.

Part 2
Recalculate the pH of the buffer prepared in "a" above if 40.0 mL of 0.200 M NaOH is added. Print an equation that shows how the sodium hydroxide is consumed by the buffering agents; an appropiate arrow is expectd. Provide a statement why sodium ion is ignored. Show accountability ofthe conjugate weak acid and weak base. Use either the Ka or Henderson-Hasselbach equation.

NOTE: I Have already calculated the first part of this problem and calculated .2g of NaF are needed for that part.

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