Phenol red indicator changes from yellow to red in the pH range from 6.6 to $8.0 .$ Without making detailed calculations, state what color the indicator will assume in each of the following solutions: (a) $0.10 \mathrm{M} \mathrm{KOH}$
(b) $0.10 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH} ;$ (c) $0.10 \mathrm{M} \mathrm{NH}_{4} \mathrm{NO}_{3} ;$ (d) $0.10 \mathrm{M}$
HBr; (e) $0.10 \mathrm{M} \mathrm{NaCN} ;$ (f) $0.10 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}-0.10 \mathrm{M}$
$\mathrm{NaCH}_{3} \mathrm{COO}$.