Identify a chemical reagent used in this experiment that can be used to distingu

Question

Identify a chemical reagent used in this experiment that can be used to distinguish solid CaCl_2 (Soluble) from solid CaCO_3 (insoluble). What is the distinguishing observation? What text reagent used in this experiment will distinguish a soluble Cl^- salt from a soluble SO_4^2- salt? What is the distinguishing observation? Predict what would be observed (and why) from an aqueous mixture for each of the following (all substances are water soluble). a. potassium carbonate and hydrochloric acid b. zinc chloride and silver nitrate c. magnesium chloride and sodium hydroxide d. ammonium nitrate and sodium hydroxide Three colorless solutions in tea tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside the tests tubes are three labels: 0.10 M Na_2CO_3, 0.10 M HCl, and 0.10 M KOH. You are to place the labels on the test tubes using only the three solutions present. Here are your tests: A few drops of the solution from test tube 1 added to a similar volume of the solution in test tube 2 produces no visible reaction but the solution becomes warm. A few drops of the solution from test tube 1 added to a similar volume of the solution in test tube 3 produces carbon dioxide gas. Identify the labels for test lubes 1, 2, and 3. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside the test tubes are three labels: silver nitrate, AgNO_3; hydrochloric acid, HCl; and sodium carbonate, Na_2CO_3. You are to place the labels on the test tubes using only the three solutions present. Here is your analysis procedure: A portion of test tube 1 added to a portion of test tube 2 produces carbon dioxide gas, CO_2. A portion of test tube 2 added to a portion of test tube 3 produces a white silver carbonate precipitate. a. On the basis of your observations how would you label the three test tubes? b. What would you expect to happen if a portion of test tube 1 is added to a portion of test tube 3? For individual solutions of the cations Ag^+, Ba^2+, Mg^2+, and Cu^2+, the following experimental observations were collected: From these experimental observations. a. identify a reagent that distinguishes the chemical properties of Ag^+ and Mg^2+. What is the distinguishing observation? b. identify a reagent that distinguishes the chemical properties of HCl and H_2SO_4. What is the distinguishing observation? c. identify a reagent that distinguishes the chemical properties of Ba^2+ and Cu^2+. What is the distinguishing observation? d. identify a reagent that distinguishes the chemical properties of Cu^2+ and Mg^2+. What is the distinguishing observation?

Explanation / Answer

Test tube 1 = 0.1M Na2CO3

Test tube 2 = 0.1M KOH

Test tube 3 = 0.1M HCl

Na2CO3 + KOH , simple compounds are miscible and dissoving of KOH is an exothermic reaction.

Na2CO3 + HCl -----> NaCl + CO2 + H2O, reaction gives CO2 gas.

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