On the basis of the given unbalanced equation, that is:
HBr (aq) + 2NaOH (aq) → 2NaBr (s) + H2O (l)
On the right side of the equation, there are 2 atoms of sodium (Na), 2 atoms of bromine (Br), 2 atoms of hydrogen (H), and 1 atom of oxygen (O₂).
After balancing the equation correctly we get:
HBr (aq) + NaOH (aq) → NaBr (s) + H2O (l)
On the right side, one atom of Na, 1 atom of Br, 1 atom of H and one atom of O₂.
Answer:
Explanation:
The name of the compound is:
Al(NO₃)₃ is Aluminium nitrate
Aluminium nitrate is an ionic compound formed when Al loses 3 valence electrons to the nitrate.
Formula of cation: A cation is a positive charged specie
Al³⁺
Formula of anion: Anion is a negatively charged specie;
NO₃⁻
We have to know the solubility of CaF₂.
The solubility of CaF₂ is: (c) 2.1 x 10-4 Molar
The general expression of solubility product of any sparingly soluble salt (having solubility S) with formula 
is: 
.
For the compound, CaF₂, x=1, y=2 So, 
=
=4S³= 3.9 x 10-11 (Given)
S³=
S³=9.75 X 
S= 2.1 X 
Molar
