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Unformatted text preview: 3.0 x 10-9 M 3. a. pH = 4.1202 b. pH = 11.27 [dont forget that there are 2 moles of -OH for every one mole of Ba(OH) 2 ] c. pH = 2.62 4. 0.398 M H 2 SO 4 5. Strange answer: It is a strong acid, so the solution should be acidic. However if you calculate pH as we normally do for strong acids, then it would seem that pH should equal 8 and the solution is basic. In reality, the solution is so dilute that the self-ionization of water makes more H 3 O + than the HClO 4 . So there must be slightly more acid in solution than that of a neutral solution. The solution should be slightly acidic (although really close to neutral.) 6. A Na 2 SO 4 solution is slightly basic. The Na + cation does not react with water, but the SO 4 2-anion can accept a proton from water to make the weak acid HSO 4-. The H 2 O that donated its proton is now the base OH and the solution is slightly basic....
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This note was uploaded on 03/08/2012 for the course CHEM 101 taught by Professor Anderson,w during the Fall '08 term at BYU.
- Fall '08