酸碱盐反应探究(外国英语资料).docVIP

酸碱盐反应探究(国外英文资料) Acid base salt reaction research First, about the acid of inquiry 1, analysis: concentrated sulfuric acid and concentrated hydrochloric acid after mixing phenomenon? And analyze the causes of these phenomena 2, formic acid (HCOOH) is a colorless, pungent smell of liquid, there is a strong corrosive. Some students want to know whether the acid has the same nature of dilute hydrochloric acid, dilute sulfuric acid, the following two experimental design: Experiment 1: to test tube containing formic acid solution with a few drops of litmus test solution, the solution was red, and then to the red solution drop by drop into the sodium hydroxide solution, the solution changed from red to blue. Experiment 2: adding proper amount of formic acid to the test tube containing proper amount of sodium carbonate solution to see the bubbles in the solution. (1) to prove that the gas experiment is composed of sodium carbonate and formic acid generated double decomposition reaction, write the experiment operation should be added:. (2) according to the purpose of this experiment, we design an experiment program. Experimental operation Experimental phenomena conclusion Formic acid is acid (3) the chemical equation of reaction in Experiment 1 is HCOOH+NaOH=HCOONa+H2O, and the chemical equation in Experiment 2 is written: Three, about the alkali of inquiry 3. Prove the wastewater of a paper mill is alkaline by different methods 4, Xiao Gang found in the chemical laboratory, the white powder filled with sodium hydroxide solution and reagent bottle rubber plug. Xiao Gang called the small army and red, together to explore this white powder composition. They look through the data to know: barium hydroxide [Ba (OH) 2] is soluble alkali, barium chloride is soluble salt, and water solution is neutral, barium carbonate is insoluble salt. [make] I conjecture: white powder is sodium hydroxide; Small army: white powder is sodium carbonate; Small red: white powder is a mixture of sodiu