Chemists use a number denoted by pH to describe quantitatively the acidity or basicity of solutions. By definition, pH = −log[H+], where [H+] is the hydrogen ion concentration in moles per liter.

Question

Many solutions have a pH between 1 and 14. Find the range

Answer 1

I assume you mean range of hydrogen ion concentration (assuming there exist hydrogen ions in solution).
Low end: 1*10^-14 moles per liter
High end: 1*10^-1 (ie, 0.1) moles per liter