If solution A has a pH of 2 and solution B has a pH of 8, which of the following statements is true? a. A has a greater [OH-] than B.
b. A is acidic and B is basic.
C. A is a base and B is an acid.
d. None of these
e. A is basic and B is acidic.

Considering the definition of pH, the correct statement is option b. A is acidic and B is basic.

You need to know that pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]

The scale has values ranging from 0 to 14, with pH 7 being the neutral solution. Solutions with pH less than 7 are acidic and alkaline (basic) those with pH greater than 7.

Then, being the pH of solution A equal to 2, being less than 7, the solution is acidic. On the other hand, the pH of solution B is 8. As the pH is higher than 7, solution B will be basic.

So, finally, the correct statement is option b. A is acidic and B is basic.

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b. A is acidic, B basic

Explanation: pH 7 is neutral, with equal H+ and OH-

pH is -log(H+ Molar Concentration) and at pH7, H+ and OH- are both at a concentration of 10^-7

A more acidic solution has more H+ than OH-, so it is a higher concentration than 10^-7 and therefore pH lower than 7. Conversely, a pH>7 means a higher concentration of OH- and lower concentration of H+

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