Three test tubes contain solutions of substances: hydrochloric acid, sulfuric acid, sodium hydroxide. Suggest a way to distinguish between these solutions.
1) Add phenolphthalein. One of the solutions will be colored with raspberry-sodium hydroxide NaOH.
2) Silver (I) nitrate is added to the remaining solutions. In a test tube with hydrochloric acid HCl, a white precipitate – AgCl – precipitates.
3) The remaining solution, with which there were no changes, is sulfuric acid H2SO4
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.