<P> A universal indicator is a pH indicator composed of a solution of several compounds that exhibits several smooth colour changes over a pH value range from 0 to 14 to indicate the acidity or alkalinity of solutions , where 7 indicates neutral . Although there are several commercially available universal pH indicators , most are a variation of a formula patented by Yamada in 1933 . Details of this patent can be found in Chemical Abstracts . Experiments with Yamada 's universal indicator are also described in the Journal of Chemical Education . </P>
<P> A universal indicator is a pH indicator composed of a solution of several compounds that exhibits several smooth colour changes over a pH value range from 0 to 14 to indicate the acidity or alkalinity of solutions , where 7 indicates neutral . Although there are several commercially available universal pH indicators , most are a variation of a formula patented by Yamada in 1933 . Details of this patent can be found in Chemical Abstracts . Experiments with Yamada 's universal indicator are also described in the Journal of Chemical Education . </P>
what is the composition of a universal indicator
what is the composition of a universal indicator
a solution of several compounds that exhibits several smooth colour changes over a pH value range from 0 to 14
a solution of several compounds that exhibits several smooth colour changes over a pH value range from 0 to 14