The table below lists some of the liquid PH liquid rainwater distilled water kitchen cleaners in lif

(Toilet cleaner), (Kitchen cleaner) (Carbon dioxide dissolved in water) (Decreased) (Acid-base neutralization failure).

Analysis: (1) When the pH of the solution is less than 7, it is acidic, and with the decrease of PH, the acidity increases, and the alkaline substance can make the phenolphthalein test solution red;

2) Normal rainwater is acidic because it dissolves carbon dioxide in the air;

3) When diluting the alkaline solution, the alkalinity weakens and the PH decreases;

4) Acid-base neutralization reaction can occur between acid and base

1) Among the above-mentioned liquids, the most acidic is the toilet cleaner, and the kitchen cleaner that can make the phenolphthalein test solution red. The kitchen is clean with detergent

2) The PH of normal rainwater is about, and the reason is that water can react with carbon dioxide in the air to form carbonic acid, and carbonic acid is acidic

3) Add distilled water to the kitchen cleaner, the PH of the kitchen cleaner will become smaller

4) Kitchen cleaner and toilet cleaner can not be mixed, the reason is that the neutralization reaction can occur between acid and alkali, which leads to the failure of the reagent