You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Estimation of free chlorine of water is done by: March 2012, March 2013 (c, g) and explain in detail?
Ans: A i.e. Ohotolidine test Test/instruments and their use Ohotolidine test enables both free and combined chlorine in water to be determined with speed and accuracy Horrock's water testing apparatus is designed to find out the dose of bleaching powder required for disinfection of water Paterson's chloronome is one such device for measuring, regulating and administering gaseous chlorine to water supplies Kata thermometer was originally devised for measuring the "cooling power" of the air. The Kata thermometer is now largely used as an anemometer for recording low air velocities rather than the cooling power of the air