suppose you had an unknown solution that contained either dissolved NaOH, NaCl< or NaNO3. you add 4 drops of AgNO3 solution to 4drops of the unknown solution and observed that no solid formed. What can be concluded the unknown solution? why?
The unknown is NaNO3. If the unknown were NaOH, a ppt of AgOH would have formed. If the unknown were NaCl, a ppt of AgCl would have formed. NaNO3 is the ONLY one of the three listed that would have no reaction with AgNO3. Great stuff, this chemistry.
AgNO3 + NaCl produces AgCl + NaNo3 how much AgCl is produced when 3.10g of AgNO3 and .600g of NaCl react?
What can be concluded about the unknown solution?
Well, it seems like our unknown solution is quite the troublemaker! No solid formed when AgNO3 was added? Looks like AgNO3 just couldn't find a good match in there. So, based on this observation, we could conclude that the unknown solution does not contain chloride ions (Cl-), because if it did, good ol' AgNO3 would have thrown a solid party with those chloride ions and formed a beautiful white precipitate called AgCl. But alas, no precipitate means no Cl- in the unknown solution.
To determine the identity of the unknown solution based on the reaction with AgNO3, we need to understand the chemical reactions involved and the solubilities of different compounds. Here's how we can deduce the conclusion step by step:
1. Known Reactions:
In this situation, AgNO3 (silver nitrate) is used as a reagent, which reacts with certain compounds to form insoluble silver salts. The known reactions with AgNO3 are:
- AgNO3 + NaCl → AgCl (s) + NaNO3 (aq)
- AgNO3 + NaOH → AgOH (s) + NaNO3 (aq)
- AgNO3 + NaNO3 → No Reaction (both compounds are soluble)
2. Experimental Setup:
You added 4 drops of AgNO3 solution to 4 drops of the unknown solution. If any solid (precipitate) formed, it indicates that one of the above reactions occurred.
3. Observations:
Since no solid precipitate formed, we can conclude that none of the above reactions occurred. Therefore, the unknown solution does not contain NaCl or NaOH.
4. Conclusion:
The unknown solution must contain sodium nitrate (NaNO3) because when AgNO3 reacts with NaNO3, no precipitate forms. Sodium nitrate is a soluble compound and does not react with AgNO3 to form insoluble silver salts.
In summary, based on the observation that no solid formed, we can conclude that the unknown solution contains NaNO3 and does not contain NaOH or NaCl.