The pH of solution is 4.38 with a concentration of 4.2 × 10⁻⁵ M H₃O⁺.
Hence, option B is correct answer.
pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14.
To calculate the pH of solution we need to know the concentration of the H₃O⁺ ion (hydronium ion )
It is expressed as:
pH = - log [H₃O⁺]
Here concentration of H₃O⁺ is given that is 4.2 × 10⁻⁵.
Now put the value in above formula we get
pH = - log [H₃O⁺]
pH = - log [4.2 × 10⁻⁵]
pH = - [log 4.2 + log 10⁻⁵] [log a × b = log a + b]
pH = -[log 4.2 - 5 log 10] [log aˣ = x log a]
pH = - [log 4.2 - 5 × 1] [log 10 = 1]
pH = - [0.623 - 5]
pH = - [-4.38]
pH = 4.38
Thus, from the above conclusion we can say that The pH of solution is 4.38 with a concentration of 4.2 × 10⁻⁵ M H₃O⁺.
Hence, option B is correct answer.
Learn more about the pH here: https://brainly.com/question/172153
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