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QUESTION
Q4) Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : [NEET 2018]
a) 60 mL 0.1M HCl + 40 mL 0.1M NaOH
b) 55 mL 0.1M HCl + 45 mL 0.1M NaOH
c) 75 mL 0.2M HCl + 25 mL 0.2M NaOH
d) 100 mL 0.1M HCl + 100 mL 0.1M NaOH
pH of which one of them will be equal to 1?




SOLUTION

In option (c)
Meq of HCl = 15
• Meq of NaOH = 5
• Meq of HCl in resulting solution = 10
• Molarity of [H+] in resulting mixture= 10/100 = 1/10
pH = –log[H+] = = 1.0
Answer: (c)