Question

What are the indicators (litimus ,mythly orange ) acids ,base or neutral ?

Answer 1

It is none of them.

Explanation:

Because they are used to indicate if a substance is acid, base or neutral. But there is a neutral litmus paper too. But usually they are none of them.

Answer 2

Methyl orange itself is base. In general, an indicator which changes color in acid solution is base and one which changes color in base is acid.

Explanation:

What you should remember is that any indicator itself (`In`, not indium in this post) has its own equilibrium point.

`HIn ⇌ H^+ + In^-`

Thus, the acidity constant for the indicator of the indicator `K_(a(In))` is obtained as follows:

`K_(a(In))=([H^+][In^-])/([HIn])`

When the solution has more acidity. i.e. [`H^+`] goes higher,
[`In^-`] will decrease. On the other hand, when the solution become more basic [`In^-`] will increase.

Generally, unionized indicator `In` and ionized indicator `In^-` have diffrent color and this is how indicators works.

For example, Methyl orange changes its color from `color(red)(red)->color(orange)"orange"->color(gold)(yellow)` as `pH` changes from `3.1` to `4.4`.

Methyl orange itself is a base since it recieves `H^+` in low-`pH` (strongly acid) solution.

Similar things can be said about other indicators.