A biology student uses 'Formalin' to preserve a specimen in the laboratory. What is the standard concentration of formaldehyde in this commercial solution?
Q1. A biology student uses 'Formalin' to preserve a specimen in the laboratory. What is the standard concentration of formaldehyde in this commercial solution?
Answer: 40% aqueous Formaldehyde
Explanation: Formalin is a 40% aqueous solution of formaldehyde used for biological preservation. 10% or 100% concentrations do not match the standard PTB definition.