Laboratory Questions Circle the questions that have been assigned. (soluble) fro

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Laboratory Questions Circle the questions that have been assigned. (soluble) from solid reagent used experiment that can be used to distinguish solid CaCI Caco, insoluble), the distinguishing observation? 2. What test reagent used in this experiment will distinguish a soluble cr salt from a soluble soi salt? what is the what would be ned (and why) frota an aqueous mixture for each of the following (all substances are water 3. Predict 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 4. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside th tests tubes are three labels: 0.10 M Na co 0.10 M HC. and 0.10 M KOH. You are to place the labels on the te 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 v ible reaction but the solution becomes warm. A few drops of the solution from test tube l added to a similar volume of the solution in test tube 3 produces carb dioxide gas. Identify the labels for test tubes 1,2, and 3. 5. Three colorless solutions in test tubes, with no labels, are in a test tube rack on the laboratory bench. Lying beside test tubes are three labels: silver nitrate, AgNObi hydrochloric acid, HCi: and sodium carbonate, Nazco, You ar 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, A portion of test tube 2 added to aportion 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 aportion of test tube 1 is added to a portion of test tube 3? 6. For individual solutions of the cations Ag Baz M and Cu the following ex observations NH,aq) HCI(aq) H2Sodaq) No change White ppt" No change. No change No change White ppt White ppt No change No change Blue ppt/deep blue soln with excess No change No change Example: When an aqueous iolution of hydrochloric acid is added to a solution coetainsg Ar

Explanation / Answer

3 )

a )   K2CO3 (aq) + HCl (aq) ----------------------> 2KCl (aq) + H2O(aq)   + CO2 (g)

CO2 gas will be releases

b)   ZnCl2 (aq) + AgNO3(aq) ----------------> AgCl (s) + Zn (NO3)2(aq)

a white precipitate AgCl is formed

c) MgCl2 (aq)   +   2 NaOH (aq) -----------------> Mg(OH)2 (aq) + 2NaCl (aq)

double dispalcement takes place

d) NH4NO3 (aq) + NaOH (aq)   ----------------------> NH4OH (aq) + NaNO3 (aq)

here also double dispalcement takes place

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