Which of the following compounds is insoluble?
Question 4 options:
A)
Ca(NO3)2
B)
FePO4
C)
NH4OH
D)
Na2SO4
E)
NaCl
Here is a simplified list of solubility rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
A)
Ca(NO3)2
B)
FePO4
C)
NH4OH
D)
Na2SO4
E)
NaCl
NH4OH
To determine which compound is insoluble, we need to examine the solubility rules for each compound and identify any exceptions.
Let's analyze the solubility of each compound:
A) Ca(NO3)2: Calcium nitrate (Ca(NO3)2) is a soluble compound according to the solubility rules, as nitrates are generally soluble.
B) FePO4: Iron(III) phosphate (FePO4) is generally insoluble except when paired with Group 1 cations or ammonium (NH4+). In this case, FePO4 is insoluble.
C) NH4OH: Ammonium hydroxide (NH4OH) is generally soluble, except when paired with Group 1 cations or those in the first two columns of the periodic table. NH4OH is soluble in this case.
D) Na2SO4: Sodium sulfate (Na2SO4) is soluble because most sulfate salts, such as those with Group 1 cations or those in the first two columns of the periodic table, are soluble.
E) NaCl: Sodium chloride (NaCl) is soluble as it is a Group 1 salt, and all salts of Group 1 cations are soluble.
Based on the solubility rules, the compound FePO4 (option B) is insoluble.