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# The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be:A. 7B. less than 7C. 0D. more than 7

Last updated date: 13th Jun 2024
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Hint: When measuring pH, the negative logarithm of the concentration of hydrogen is taken. It can be only done if the hydrogen ions are able to move about freely in the solution, it only happens in a specific type of solution.

At pH=7 the solution is said to be neutral, as it has equal amounts of ${{H}^{+}}$ and $O{{H}^{-}}$ ions.
So, on dipping a pH paper in a solution, we get a colour and by identifying the colour, we can get the respective pH values. Mathematically pH is represented by: $pH=-\log [{{H}^{+}}]$, so pH depends on the concentration of hydrogen ions present in the solution. However, for that to happen the solution must be aqueous. Only in aqueous solutions the ions get dissociated, and dissociation does not take place in non-aqueous solutions.
NOTE: As $pH=-\log [{{H}^{+}}]$, hence it is a decreasing function. A solution that has more ${{H}^{+}}$ in it will have more pH. Moreover, the pH of pure water at ${{25}^{0}}C$ is equal to 7. Temperature also plays a role in determining the pH.