The table below shows the molar concentrations of hydronium ion, H3O+, in four different solutions.

January 2019 NY Regents Chemistry Exam

48 The table below shows the molar concentrations of hydronium ion, H3O+, in four different solutions.

Which solution has the highest pH?

(1) A

(2) B

(3) C

(4) D

Solution: The highest pH means the most basic solution. The less the concentration of hydronium ion (H3O+) is, the more basic the solution.

Answer: 4

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