Question

$pH$ value of a solution signifies:
A.Power of hydrogen
B.$- \log [{H^ + }]$
C.14 – pOH
D.All of the above

Answer 1

$pH$ is unit or scale to measure the acidity or basicity of an aqueous solution or measure of concentration of H+ ions in the solution. pH scale is logarithmic and inversely gives the value of concentration of hydrogen ion in aqueous solution

Complete step by step answer:
pH is power of hydrogen as $pH$ is measure of concentration of hydrogen ion. $pH$ scale is logarithmic and inversely gives the value of concentration of hydrogen ions means $pH$ value increases when concentration of hydrogen ions decreases and vice-versa. And we can also say that $pH$ is the power of hydrogen.
So, $pH = - \log [{H^ + }]$
$pOH$ is a measure of concentration of hydroxide ions. For an aqueous solution, $pH + pOH = 14$then $pH = 14 - pOH$.
Hence, all three statements are true about the $pH$ of a solution.
So, the correct answer is option D.

Note:
$pH$ of a solution is used to measure its acidity or basicity. If $pH$ of a solution is less than 7 then it is acidic, if $pH$ is greater than 7 then it is basic or if $pH$ is equal to 7 then it is neutral (neither acidic nor basic). $pH$ of its solution is less than 0 if it is a very strong acid or $pH$ of solution can be greater than 14 if the solution has a very strong base.