A laboratory technician prepares 100 grams of Formalin solution. According to standard PTB definitions, how many grams of Formaldehyde gas are present in this solution?
Q1. A laboratory technician prepares 100 grams of Formalin solution. According to standard PTB definitions, how many grams of Formaldehyde gas are present in this solution?
Answer: 40 grams
Explanation: Formalin is a 40% aqueous solution of Formaldehyde. Option B describes the percentage of methanol often added as a stabilizer.