in case of acidosis the ph of the blood is
Acidosis Acidosis is said to occur when arterial pH falls below 7.35 (except in the fetus â€“ see below), while its counterpart (alkalosis) occurs at a pH over 7.45. Arterial blood gas analysis and other tests are required to separate the main causes.
Phenol red A solution of phenol red is used as a pH indicator, often in cell culture. Its color exhibits a gradual transition from yellow (λmax = 443 nm[2]) to red (λmax = 570 nm[3]) over the pH range 6.8 to 8.2. Above pH 8.2, phenol red turns a bright pink (fuchsia) color.[4][5]