A technician needs to prepare a standard formalin solution using 200g of formaldehyde gas. What is the total mass of the resulting 40% solution?
Q1. A technician needs to prepare a standard formalin solution using 200g of formaldehyde gas. What is the total mass of the resulting 40% solution?
Answer: 500 g
Explanation: Formalin is a 40% formaldehyde solution; 200g divided by 0.4 equals 500g. 400g is a common mistake assuming 50% concentration.