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Question
Which of the following solution will have a pH value equal to 1.0?
Options
50 mL of 0.1 M HCl + 50 mL of 0.1 M NaOH
60 mL of 0.1 M HCl + 40 mL of 0.1 M NaOH
20 mL of 0.1 M HCl + 80 mL of 0.1 M NaOH
75 mL of 0.2 M HCl + 25 mL of 0.2 M NaOH
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Solution
75 mL of 0.2 M HCl + 25 mL of 0.2 M NaOH
Explanation:
75 mL of 0.2M HCl + 25 mL of 0.2M NaOH
HCl moles = `0.2 xx 75/1000 = 0.015` mol
NaOH molecules = `0.2 xx 25/1000 = 0.005` mol
Excess HCl = 0.01 mol
Total volume = 100 mL = 0.1 L
log(0.1) = 1
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