Numbers 3, 4, 6 Link to lab: https://www.dropbox.com/s/qzdg5w1x19cr79k/document%

Question

Numbers 3, 4, 6

Link to lab: https://www.dropbox.com/s/qzdg5w1x19cr79k/document%20%283%29.pdf?dl=0

Circle the questions that have been assigned. 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 test 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 test 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 tubes 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_CO_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 H2SO4. 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? Identification of a Compound: Chemical Properties

Explanation / Answer

Q1.

CaCl2 and CaCO3 ---> any acid will react vigorously with CaCO3, since it may act as a base

for CaCl2, expect no reaction, sinc eit remains all in ions

Q2.

Addition of Ag+ ions in AgNO3 reagent will precipitate selectively the Cl- ions in solution

For SO4-2, you could add Ba+2 ions to form BaSO4

Q3.

a)

K2CO3 + HCl --> gas formation (CO2) and neutralization

b)

ZnCl2 + AgNO3 --> AgCl precipitation (solid)

c)

MgCl2 + NaOH --> formation of Mg(OH)2 whch is white solid

d)

NH4NO4 + NaOH --> NH3 formation as gas

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