GK
CHEMISTRY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
1
|
|
|
7
|
|
|
14
|
|
|
4
|
Detailed explanation-1: -The range goes from 0-14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Detailed explanation-2: -pH 7 is not always neutral The answer is no, since what defines a neutral solution is the presence of an equal number of moles of H+ and OH− ions, a situation that may occur at any pH value. For example, you could have a solution of just H+ ions at a concentration of 10−7 mol L−1 but this would clearly not be neutral.
Detailed explanation-3: -Ions are just atoms that have an electric charge on them, so H+ is a hydrogen atom with charge of 1. Even in pure water ions tend to form due to random processes (producing some H+ and OH-ions). The amount of H+ that is made in pure water is about equal to a pH of 7. That’s why 7 is neutral.