CHEMICAL ANION ADDITION OF AgNO3 ADDITION OF HCl NaBr BROMIDCARBONATEE CLOUDY NO

Question

CHEMICAL

ANION

ADDITION OF AgNO3

ADDITION OF HCl

NaBr

BROMIDCARBONATEE

CLOUDY

NOTHING

Na2CO3

CHLORIDE

CLOUDY

BUBBLES

NaCl

IODIDE

CLOUDY

THIN CLOUD

Nal

SULFATE

CLOUDY

THICK WHITE COLOR

Na2SO4

SULFIDE

NOTHING

THIN WHITE

Na2S

YELLOW CLOUD

BROWN CLUMPS

UNKNOWN 103

WHITE CLOUD

THICK WHITE

UNKNOWN 104

BLACK CLOUD

BROWN CLOUD

What was the identity of the anion in Unknown #103? Explain how you used the observations recorded in Data Table 1 to reach this conclusion.

What was the identity of the anion in Unknown #104? Explain how you used the observations recorded in Data Table 1 to reach this conclusion.

Write the chemical equation for ionic reaction between Na2 S and AgNO3 .

Write the chemical equation for ionic reaction between NaBr and AgNO3 .

Use your results and observations in Data Table 1 to create a flow chart for identification of unknown anions, using the AgNO3 and HCl confirmation tests. Insert the flow chart below

CHEMICAL

CATION

FLAME OBSERVATIONS

Kl

POTASSIUM

YELLOW

CaCl2

CALCIUM

RED

LiOH

LITHIUM

PURPLE

NaCl

SODIUM

ORANGE

Cu(NO3)2

COPPER

PURPLE RED AND GREEN

UNKNOWN 105

GREEN

UNKNOWN 106

ORANGE

UNKNOWN 107

NO CHANGE

CHEMICAL

CATION

ANION TEST OBESERVATIONS

ANION

COMPLETE CHEMICAL NAME

105

106

107

A. What was the identity of the cation in Unknown #105? Explain how you used the observations

recorded in Data Table 1 to reach this conclusion.

B. Use your results and observations in Data Tables 1, 2, and 3, to create a flow chart for the

identification of an unknown (both an unknown anion and cation), using the AgNO3

and HCl

confirmation tests and the cation flame tests.

C. If you were asked to confirm the identity of an unknown chemical as lithium sulfide (Li2

S),

describe the tests that you would use to confirm the identity. Use your results in both Exercise

1 and Exercise 2 to describe the observations in both the cation and anion tests that would

allow the unknown to be confirmed as lithium sulfide.

CHEMICAL

ANION

ADDITION OF AgNO3

ADDITION OF HCl

NaBr

BROMIDCARBONATEE

CLOUDY

NOTHING

Na2CO3

CHLORIDE

CLOUDY

BUBBLES

NaCl

IODIDE

CLOUDY

THIN CLOUD

Nal

SULFATE

CLOUDY

THICK WHITE COLOR

Na2SO4

SULFIDE

NOTHING

THIN WHITE

Na2S

YELLOW CLOUD

BROWN CLUMPS

UNKNOWN 103

WHITE CLOUD

THICK WHITE

UNKNOWN 104

BLACK CLOUD

BROWN CLOUD

Explanation / Answer

Unknown-103:

Addition of AgNO3 to this solution gives white cloudy and then turns into thick white on addition of HCl.

From table: NaI solution gives a white cloudy on addition of AgNO3 solution and turns into thick white on addition of HCl.

So, the anion in the unknown-103 solution is iodide (I- ).

Unknown-104:

This solution gives black cloud on addition of AgNO3 and Brown cloud on addition of HCl.

From table: Na2S can only gives yellow cloud on addition of AgNO3 and brown cloud on addition of HCl and no anion gives black cloud.

So, the anion in unknown-104 solution is sulfide (S2- ).

The net ionic equation between Na2S and AgNO3 is,

S2- (aq) + 2Ag+ (aq) -------> Ag2S(s)

The net ionic equation between NaBr and AgNO3 is,

Br- (aq) + Ag+ (aq) ------> AgBr(s)

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