pH of a saturated solution of is 9. The solubility product () of is:

Question

pH of a saturated solution of  is 9. The solubility product () of  is:

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🧠 The "Aha!" Moment
, , and  are all linked by the concentration of Hydroxide ions. Once we know the "basicity" of the solution (), we can work backwards to find the concentration of the dissolved salt.

🗺️ The Quantitative Route
1. Find :
   - .
   - .
2. The Dissociation:
   
   From the stoichiometry, .
3. Applying :

⚡ The 30-Second Calculation
.
For , .
. Done.

⚠️ Common Traps
The biggest mistake is forgetting to divide the  by  to get the ! If you treat  as equal to , you'll

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