Three test tubes contain hydrochloric acid, sodium hydroxide and sulfuric acid solutions.
| June 24, 2021 | education
Three test tubes contain hydrochloric acid, sodium hydroxide and sulfuric acid solutions. How to determine the contents of each of the tubes?
The test tubes contain acids – hydrochloric and sulfuric – and alkali – sodium hydroxide.
Acids and alkalis tend to discolor the indicators.
We put a litmus paper into each test tube. In a test tube with acid, it will turn red, and in a test tube with alkali NaOH, it will turn blue.
To distinguish in which test tube sulfuric and hydrochloric acids, we add barium chloride.
In a test tube with sulfuric acid, a white precipitate will form – barium sulfate; in a test tube with hydrochloric acid, the reaction will not occur.
H2SO4 + BaCl2 = BaSO4 + 2HCl.
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