The pH of a solution, whose hydrogen ion concentration is 1×10^-5 mole per litre, will be ________.

pH is a measure of the concentration of hydrogen ions (H+) in a solution. It is defined as the negative logarithm (base 10) of the hydrogen ion concentration: pH = -log10[H+], where [H+] represents the hydrogen ion concentration in moles per liter (M). In this case, the hydrogen ion concentration is given as 1×10^-5 M. Substituting this value into the formula, we get: pH = -log10(1×10^-5) = 5. Therefore, the pH of the solution is approximately 5.