Methyl orange shows red color in acidic medium and yellow color in basic medium. Because it changes color at the pKa of a mid strength acid, it is usually used in titration for acids. Unlike a universal indicator, methyl orange does not have a full spectrum of color change, but it has a sharp end point.
n = m/M = 2/18 = 1/9 ~0,1 mol
Explanation:
it should be option number (D) Iron (III) oxide
... indicates that it also has a high concentration of Hydroxide (OH) and that it is more basic.
