Acid Base Equilibria

Step 1: Understanding the Question:
The question requires calculating the net acidity or basicity of three different mixtures of strong acids and strong bases to determine their relative pH order.
Step 2: Key Formula or Approach:
1. Calculate millimoles (mmol) of and for each case.
2. If , the solution is acidic ( ).
3. If , the solution is neutral ( ).
4. If , the solution is basic ( ).
Step 3: Detailed Explanation:
Mixture A:
mmol of .
mmol of (as provides 2 ions).
mmol of .
mmol of .
Net .
The solution is basic, so pH >7.
Mixture B:
mmol of .
mmol of .
mmol of .
mmol of .
Net .
The solution is neutral, so pH = 7.
Mixture C:
mmol of .
mmol of .
mmol of .
mmol of .
Net .
The solution is acidic, so pH <7.
Ordering by increasing pH: C (Acidic) Step 4: Final Answer:
The correct order is C