Circle the that have ansiered. i. ldcarity a chealical reagent used in esprimrer

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Circle the that have ansiered. i. ldcarity a chealical reagent used in esprimrer that 2. What Best and from an aqueous mixture for each orahe follewing all substances are water Potassium carbonate and hydrochloric acid chloride silver nirate magnesium chloride and sodium hydroxide ammonium nirale and sodium hydroxide Lying besile the 4. Three colorless solutions he racks on la oratory bench are three in lest tubes, with labels, in to place labela o 10 M Natco o HCI, and o vo M xoH You are Eubes using only the three solutions presenu. Here are your tests: A few drops of solution from lest tube I added a ible reaction but the solution bewomes warm. solution in tes whe 3 poduces cartee A few drops of the solution from lest tube lassed to a similar volume of the dioxide gas. Identify the labels for test tubes I, 2, and 3 he laboratory bench Lying beside the Naico You are no in test tubes, with ao labels, are in a test tube rack on 5. Three colorless solutions test Dubes are three labels: silver nitrale, AENO,: hydrochloric acid, HCI and sodiam carbonate. only Here is your analysis precedure: A portion oftest oube I added to apertion oftest tube 2 produces carbon dioxide gas co. to a portion of test tube 3 produces a white silver eartonale Precipitate a. On the basis of your observations bow would you label the three test tubes? b. What would you expect to happen ifa portion oftest tube l is added to a portion of test tube 3? 6 Fr individual solutioos of the cations Ag', Ba?.. Mr. and cu.. the following experimental observations were HSOM White ppe No change No change No change No change White ppt Blue ppudeep blue soln with excess No change No change From these experimental observations, a. identify a reagent that distinguishes the chemical properties of Ag and Mg". What is the distinguishing observation? properties of HCI and H,so. What is the distinguishing identify a reagent that distinguishes the chemical observation? of Ba and cu What is the distinguishing observa- identify a reagent that distinguishes the chemical properties .d. identify a reagent that distinguishes the chemical propertiesofcu and Mg What is the distinguishing obser 66 Identification of a Compound: Chemical Properties

Explanation / Answer

1) Silver nitrate can be used to distinguish CaCl2 from CaCO3 as AgNO3 will give white ppt of AgCl on reaction with CaCl2.

2) Again we can use silver nitrate to distinguish Cl- and SO4-2

Ag+ will give white ppt of AgCl on reaction with Cl-

3) K2CO3 + 2HCl --> CO2 + 2KCl + H2O

So this will give brisk effervescence of CO2

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

It will give white ppt of AgCl

c) MgCl2(aq) + 2NaOH(aq) 2NaCl(aq) + Mg(OH)2(s)

ppt of Mg(OH)2 will be obtained

d) NH4+(aq) + OH-(aq) ----> NH3(g) + H2O(l)

So a distinct ammonical smell will be observed

4) Tube 1 and tube 2 contains the base (KOH and Na2CO3) while tube 3 contains acid as it will get neutralized with base and evolve heat of neutralization

Tube 1 to tube 3 produced CO2

so the reaction will be

Na2CO3 + 2HCl --> CO2(g) + 2NaCl + H2O

Tube 1 : Na2CO3

Tube2: KOH

Tube 3 :HCl

6) the CO2 is produced when Na2CO3 reacts with HCl (tube 1 and tube 2 either Na2CO3 or Hcl)

2AgNO3 + Na2CO3 --> Ag2CO3(s) + 2NaNO3

So tube 3 : AgNO3

Tube 2 : Na2CO3

Tube 1 : HCl

A white ppt of AgCl will be formed

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