Question

. A student measured the pH of four solutions. Which pH indicates the lowest hydronium ion concentration?

1.4

4.5

7.0

10.3

Answer 1

Higher the value of pH, lower is the value of acid dissociation constant. Hence lowest is the hydronium ion concentration. Hence pH = 10.3 indicates lowest hydronium ion concentration

Answer 2

Answer: The correct answer is 10.3

Step-by-step explanation:

pH is defined as the negative logarithm of hydrogen or hydronium ion concentration. It is represented by the chemical equation:

`pH=-\log[H^+]`

From the above equation, it is visible that hydrogen ion concentration and pH are inversely proportional. So, for more hydrogen ion concentration, the value of pH will be low and vice-versa.

pH scale ranges from 0 to 14. For acidic solution, the pH ranges from 0 to 6.9. for basic solutions, the pH ranges from 7.1 to 14. For neutral solution, the value of pH is 7.

We are asked the value of pH which indicates the lowest hydronium ion concentration. So, the solution having high pH value will have the lowest hydrogen or hydronium ion concentration.

Hence, the correct answer is 10.3