Multiple Choice
What is the Kw of pure water at 20.0°C, if the pH is 7.083?
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17. Acid and Base Equilibrium
The pH Scale
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the pH of 0.0200 M HCl?
A
0.70
B
1.70
C
7.00
D
12.30
E
13.30
Verified step by step guidance1
Understand that HCl is a strong acid, which means it dissociates completely in water. Therefore, the concentration of hydrogen ions [H⁺] is equal to the concentration of HCl.
Since the concentration of HCl is given as 0.0200 M, the concentration of hydrogen ions [H⁺] is also 0.0200 M.
Recall the formula for calculating pH: \( \text{pH} = -\log[\text{H}^+] \). This formula is used to find the pH from the concentration of hydrogen ions.
Substitute the concentration of hydrogen ions into the formula: \( \text{pH} = -\log(0.0200) \).
Use a calculator to find the logarithm and then multiply by -1 to determine the pH value.
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