If you analyzed each of the substances
NaBr, KOH, CrPO4, Pb(OH)2, RbCl, LiNO3
by mixing them with water in a beaker, which
substances would be most likely to fall to the
bottom of the beaker?
1. KOH and Pb(OH)2
2. CrPO4 and LiNO3
3. NaBr
4. RbCl and LiNO3
5. CrPO4 and Pb(OH)2
6. LiNO3 and NaBr
CrPO4 and Pb(OH)2
All nitrates are soluble, so LiNO3 would dissolve. Sodium & potassium salts are soluble, so NaBr and KOH are out. Chlorides in this case are soluble, so RbCl is out, leaving the other two.
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Well, if we're talking about substances falling to the bottom of a beaker, I can imagine them forming a competition for the "most likely to sink" title, just like in a water ballet. So let's analyze the contenders:
- KOH and Pb(OH)2: These two compounds both contain hydroxide ions (OH-) which have a tendency to form precipitates with many metal ions. So they might have a high chance of performing a graceful sink to the bottom.
- CrPO4 and LiNO3: CrPO4 is insoluble in water, meaning it doesn't like to dissolve. Meanwhile, LiNO3 is highly soluble, meaning it's the life of the party and loves to mingle with water molecules. So I don't think they'll participate in the sinking competition.
- NaBr: Sodium bromide is actually very soluble in water, so it won't feel the need to show off its sinking skills.
- RbCl and LiNO3: RbCl, like NaBr, is quite soluble in water, so it prefers to stay in the solution and not sink to the bottom. As for LiNO3, we already established that it loves water too much to sink.
- CrPO4 and Pb(OH)2 (again): Since CrPO4 doesn't like to dissolve and Pb(OH)2 wants to form a precipitate, they both seem like good contenders for the sinking competition.
- LiNO3 and NaBr (again): We've already established that these compounds are not big fans of sinking, so I wouldn't bet on them to take the plunge.
In light of all this, the substances that would most likely fall to the bottom of the beaker are:
1. KOH and Pb(OH)2 (two hydroxide lovers)
5. CrPO4 and Pb(OH)2 (because CrPO4 doesn't dissolve)
Now, let's find a stage for their water ballet competition!
To determine which substances are most likely to fall to the bottom of the beaker when mixed with water, you need to consider their solubilities.
Solubility refers to the ability of a substance to dissolve in a particular solvent, such as water. Substances that are more soluble in water tend to stay dissolved, while less soluble substances tend to form precipitates that fall to the bottom.
To find the solubility of each substance, you can consult a solubility table or reference book. However, I will provide the solubility information for the substances you mentioned:
- NaBr: NaBr is highly soluble in water. Therefore, it will remain dissolved and not fall to the bottom.
- KOH: KOH is also highly soluble in water. Like NaBr, it will not form a precipitate.
- CrPO4: CrPO4 is insoluble or only slightly soluble in water. It will likely form a precipitate and fall to the bottom.
- Pb(OH)2: Pb(OH)2 is sparingly soluble in water. It will also form a precipitate and settle at the bottom.
- RbCl: RbCl is highly soluble in water, so it will not precipitate.
- LiNO3: LiNO3 is highly soluble in water. It will remain dissolved and not form a precipitate.
Based on this information, the substances most likely to fall to the bottom of the beaker are CrPO4 and Pb(OH)2. Therefore, the correct answer is option 5: CrPO4 and Pb(OH)2.
You need to know the solubility rules. Here is a simplified set of rules.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html