Some literature data gives 31~34% (w/w) at 25oC, some give ~470g NH3 gas/kg water.
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The saturation level of ammonia in water depends on temperature and pH. At 20°C and pH 7, the saturation level of ammonia in water is around 37 ppm. At higher temperatures or pH levels, the saturation level can increase.
To determine the saturation level in a substance, you can conduct a saturation test by adding the substance to a solvent until no more can dissolve. The point at which no more can dissolve is the saturation level.
The pH level of ammonia (NH3) is around 11-12, indicating that it is a weak base. It can react with water to form ammonium hydroxide (NH4OH), which further contributes to the basic pH.
The pH of ammonia solution is about 11. In a 1M ammonia solution (my guess is 17g/L), about 0.42% of the ammonia is converted to ammonium (my guess is 0.07 g/L), equivalent to a pH of 11.63.
Ammonia (NH3) is the solute, and water (H2O) is the solvent in ammonia water.
Ammonia cleaning fluid is considered alkaline because it has a pH level greater than 7. When dissolved in water, ammonia produces hydroxide ions, making it an alkali.