The percentage of chlorine in sodium hypochlorite solution depends on the concentration of the solution. Sodium hypochlorite is commonly used as a disinfectant and bleaching agent, and its concentration is often expressed in terms of available chlorine.

A typical household bleach solution contains around 5.25% sodium hypochlorite by weight. This means that in a 100-gram solution, 5.25 grams are sodium hypochlorite, and the remaining 94.75 grams are water and other impurities.

The percentage of chlorine in a sodium hypochlorite solution can be calculated using the following formula:

% Chlorine = (Concentration of sodium hypochlorite in ppm) / 35,450 X 100

For example, if the concentration of sodium hypochlorite in a solution is 10,000 ppm, the percentage of chlorine in the solution can be calculated as:

% Chlorine = (10,000 ppm) / 35,450 X 100 = 0.282%

Therefore, a 10,000 ppm sodium hypochlorite solution contains approximately 0.282% chlorine.