On the morning of February 20, 2009, because the water source of Chengxi Waterworks was polluted by phenolic compounds, there was a large-scale water cut in Yancheng City, Jiangsu Province, which caus

On the morning of February 20, 2009, because the water source of Chengxi Waterworks was polluted by phenolic compounds, there was a large-scale water cut in Yancheng City, Jiangsu Province, which caused at least 200,000 residents' health damage. (1) The pH value of the solution can be determined by pH test paper or acidity meter, so the answer to this question is: pH test paper or acidity meter;

(2) The water obtained after purification treatment such as precipitation and filtration contains soluble solids, not pure water, so the answer to this question is: No;

(3) According to the reaction between calcium hydroxide and chlorine, it can be inferred that sodium hydroxide can react with chlorine to produce sodium chloride, sodium hypochlorite and water, so the answer to this question is: Cl2+2 NaOH ═ NaCl+NaClO+H2O;

(4) Soapy water can be used to test hard water and soft water, so the answer to this question is: Soapy water;

(5) Adding substances such as ethylene glycol and glycerol to water can reduce the freezing point of water, so the answer to this question is: reduce;

(6) Saving water can start with small things, such as watering flowers with Taomi water, so the answer to this question is: Watering flowers with Taomi water.