水溶性pH指示剂;中性(红色)至酸性(黄色)值。;Water soluble pH indicator; neutral (red) to acidic (yellow) values.;Phenol Red sodium salt is a water soluble pH indicator used in the 6.8 (yellow) to 8.2 (red) range.;Phenol Red sodium salt is a water soluble pH indicator used in the 6.8 (yellow) to 8.2 (red) range.A small molecule pH indicator.