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April 16, 2014

Homework Help: chemistry

Posted by tt on Wednesday, August 3, 2011 at 5:41pm.

1. A solution of sodium oxalate has a pH of 7.82. The [OH-] in mol/L must be which of the following:
a) 6.18 b) 1.5 x 10-8 c) 6.6 x 10-7 d) 7.82 e) -7.82
2. When 0.93 mol of O2 and 0.56 mol of NH3 are mixed together and allowed to come to equilibrium according to the equation:
4NH3(g) + 5O2(g) 6H2O(g) + 4NO(g)
At equilibrium it is found that there are 0.77 mol of O2. Which substance has a change in number of mols of 0.192 as the system comes to equilibrium?
a) H2O b) NH3 c) O2 d) NO e) no substances change by 0.192 mol
3. At normal body temperature, Kw has a value of 2.42 x 10-14. What is the pH of a neutral solution at this temperature?
a) 7.2 b) 13.6 c) 6.8 d) 7.0 e) 6.2

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