Author Question: A solution is prepared by dissolving 0.23 mol of hypochlorous acid and 0.27 mol of sodium ... (Read 72 times)

luminitza · **on:** Aug 27, 2018

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

frogdreck123456 · **Reply #1 on:** Aug 27, 2018

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