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Author Question: A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium ... (Read 114 times)

luminitza

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A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium hypochlorite in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of HCl to this buffer solution causes the pH to drop slightly.
 
  The pH does not decrease drastically because the HCl reacts with the ________ present in the buffer solution. The Ka of hypochlorous acid is 1.36  10-3. A) H2O
  B) H3O+
  C) hypochlorite ion
  D) hypochlorous acid
  E) This is a buffer solution: the pH does not change upon addition of acid or base.

Question 2

For the reaction 2 C4H10 (g) + 13 O2 (g)  8 CO2 (g) + 10 H2O (g)
 
  H is -125 kJ/mol and S is +253 J/K  mol. This reaction is ________.
  A) spontaneous at all temperatures
  B) spontaneous only at high temperature
  C) spontaneous only at low temperature
  D) nonspontaneous at all temperatures
  E) unable to determine without more information

Question 3

The angles between sp2 orbitals are ________.
 
  A) 45
  B) 180
  C) 90
  D) 109.5
  E) 120


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frogdreck123456

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luminitza

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Reply 2 on: Aug 27, 2018
Thanks for the timely response, appreciate it


tandmlomax84

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Reply 3 on: Yesterday
Wow, this really help

 

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