hw8due031510 - of water in order to make the buffer pH =...

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Due Monday March 15 Prof. William Casey Name_________________________________________ Chemistry 2B, Winter 2010 Student ID Number______________________ Homework 8 Lab TA Name and Time______________________ Instructions: Show all of your work in addition to your answer to the following questions on a separate piece of paper. Put your name on this and all pages, staple your work to this page, and turn it in to your TA’s mailbox by 5 PM on Monday March 15, 2010 . (1) If 100 g of MgF 2 are added to 1 L of water, what mass of MgF 2 dissolves given that K sp = 3.7 x 10 8 for MgF 2 in water? Does MgF 2 dissolve or precipitate from this solution upon adding NaNO 3 to the solution? (2) Consider the sodium sulfate/sodium bisulfate (Na 2 SO 4 /NaHSO 4 ) buffer system where K a = 1.1 x 10 –2 for HSO4 . How many grams of each of these salts should you add to 1 L
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Unformatted text preview: of water in order to make the buffer pH = 2.5? (3) At what temperature does a chemical reaction with ∆ S = 69 J/(mol·K) and ∆ H = 270 kJ/mol become spontaneous? (4) If ∆ G = 98.5 kJ/mol for the chemical reaction in the previous problem at T = 25 ° C, what is the equilibrium constant K at this temperature? (5) Consider the normal freezing point of water. What are the signs (positive or negative) of ∆ S and ∆ H for the freezing of liquid water to form ice and what is the ratio of ∆ H/ ∆ S at standard pressure? Now, consider the normal boiling point of water. What are the signs (positive or negative) of ∆ S and ∆ H for the boiling of liquid water to form ice and what is the ratio of ∆ H/ ∆ S at standard pressure?...
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This note was uploaded on 06/13/2010 for the course CHEM 995940767 taught by Professor Topadakis during the Spring '10 term at UC Davis.

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