The addition of which nitrate salt will cause a decrease in the concentration of I-(aq)?
Pb(NO3)2
Ca(No3)2
LiNo3
KNo3
This is actually 10th grade chemistry and I can't figure it out either
To determine which nitrate salt will cause a decrease in the concentration of I-(aq), we need to consider the concept of solubility and the common ion effect. The common ion effect states that the solubility of a slightly soluble salt is reduced when a common ion is present in the solution.
In this case, we have four nitrate salts: Pb(NO3)2, Ca(NO3)2, LiNO3, and KNO3. We need to determine the effect of each of these salts on the concentration of I-(aq), which represents iodide ions in the solution.
To do this, we need to look at the solubility rules. According to the rules, most nitrate salts are soluble, meaning they dissociate into their constituent ions in solution. Therefore, all four nitrate salts will ionize and release their respective cations (Pb2+, Ca2+, Li+, and K+) and nitrate ions (NO3-) into the solution.
Now, let's consider the effect of each cation on the concentration of I-(aq):
1. Pb(NO3)2: When lead(II) nitrate (Pb(NO3)2) is added to the solution, it will release Pb2+ ions. Since these ions are not common with I-(aq), they will not affect the concentration of I-(aq).
2. Ca(NO3)2: Calcium nitrate (Ca(NO3)2) will dissociate to release Ca2+ ions. Similar to Pb2+ ions, Ca2+ ions are not common with I-(aq), so they will not have an effect on the concentration of I-(aq).
3. LiNO3: Lithium nitrate (LiNO3) will dissociate to release Li+ ions. Again, Li+ ions are not common with I-(aq), so they will not affect the concentration of I-(aq).
4. KNO3: Potassium nitrate (KNO3) will ionize to release K+ ions. These potassium ions are common with I-(aq), as both are ions that can be found in a solution of potassium iodide (KI). As a result, the addition of KNO3 will cause a decrease in the concentration of I-(aq) due to the common ion effect.
Therefore, the correct answer is KNO3. Adding potassium nitrate (KNO3) to the solution will cause a decrease in the concentration of I-(aq) due to the common ion effect.
The School Subject is NOT 10th grade. If you name your post correctly you will get the best help sooner.
Sra