What solution is used to detect chlorine leaks?

The solution used to detect chlorine leaks is a 10% solution of ammonia hydroxide. When ammonia comes into contact with chlorine gas, it creates a significant and visible reaction. This is a practical method used in various scenarios to ensure safety in environments where chlorine is present, such as water treatment facilities. The presence of chlorine can indicate a leak in systems that utilize chlorine for disinfection or treatment processes.

The other options do not produce the same clear indicators of chlorine presence. Sodium hydroxide, hydrochloric acid, and bleach can react with chlorine in ways that do not offer the same clarity for leak detection or may even produce hazardous fumes. Therefore, the effectiveness of ammonia hydroxide in this context makes it the preferred choice for detecting chlorine leaks in water treatment operations.