Arrange the following resultant mixtures in increasing order of their pH values A. 10 mL 0.2 M Ca(OH)_2 + 25 mL 0.1 M HCl B. 10 mL 0.01 M H_2SO_4 + 10 mL 0.01 M Ca(OH)_2 C. 10 mL 0.1 M H_2SO_4 + 10 mL 0.1 M KOH Choose the correct answer from the options given below:
C. C < B < A
For mixture A: Millimoles of OH^ - = 10 0.2 2 = 4 Millimoles of H^ + = 25 0.1 1 = 2.5 Remaining OH^ - = 4 - 2.5 = 1.5 mmol The solution is basic, so pH > 7. For mixture B: Millimoles of H^ + = 10 0.01 2 = 0.2 Millimoles of OH^ - = 10 0.01 2 = 0.2 The solution is completely neutralized, so pH = 7. For mixture C: Millimoles of H^ + = 10 0.1 2 = 2 Millimoles of OH^ - = 10 0.1 1 = 1 Remaining H^ + = 2 - 1 = 1 mmol The solution is acidic, so pH Therefore, the increasing order of pH values is C Answer: C < B < A
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