Homework Help: chemistry

Posted by Judy on Friday, June 4, 2010 at 6:52pm.

Enter the formula and state of the major species that result when a few grams (about 0.01 mol) of each substance is added to 100 mL of water. When appropriate use water to form species such as the hydronium ion. Separate multiple species by commas.

sulfur dioxide: S2-(aq), 2O-2 (aq)

silver sulfide: 2Ag+(aq), S-2 (aq)

nitrous acid: H+ (aq), NO2- (aq)

strontium fluoride: Sr+2(aq), 2F- (aq)

can you chem my answers..i don't think i did all of them correctly

chemistry - DrBob222, Friday, June 4, 2010 at 7:32pm
First, I criticize the question for it isn't too clear as to what is wanted. The SrF2 I picked is the easiest one to do. The others have problems. But I can help give qualified answers.
SO2 + H2O forms primarily H2SO3. That is a weak acid and doesn't ionize to a large extent. But it forms H3O^+ and HSO3^- with smaller amounts of SO3^-2. If you follow the directions closely, however, the MAJOR specie is H2SO3.
Ag2S doesn't dissolve in water to a large extent so the MAJOR specie is Ag2S(s).
HNO2 + water forms H3O^+ + NO2^-; however, not to a large extent and the MAJOR specie is HNO2(aq).
The trouble with questions of this type comes in knowing what the writer means by major. That isn't a good quantitative measure.

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