Chemical Reactions Discovery Experiment

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Chemistry

School

University of San Diego

Course

CHEM 151

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Homework

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CHEMICAL REACTIONS DISCOVERY EXPERIMENT

1. At the beginning of the semester, you performed two different qualitative analysis tests

on a set of solutions: a) 0.1 M AgNO

(aq), and b) 1 M HCl (aq). Use your data/ results

from Experiments #1 to complete this table.

Table 3

Which chemicals

Reacted with

AgNO

(aq)?

(a “positive” test)

Which chemicals did

not react with

AgNO

(aq)?

(a “negative” test)

Which chemicals did

not react with

HCl (aq)?

(a “negative” test)

Which chemicals did

not react with

HCl (aq)?

(a “negative” test)

NaCl, LiCl, BaCl

KBr

The observation was

White precipitates

apart from KBr

which produced

yellow precipitates.

Ca(NO

)

The solution

remained clear

Formation of bubbles.

NaCl, LiCl, BaCl

Ca(NO

)

, KBr

Ba(NO

)

No bubbles were

formed.

2. In the context of that experiment, what was each testing for?

AgNO

(aq) is used to test halides.

HCl (aq) is used to test presence of carbonates.

Table 4

Test Reagent

Observation (i.e. bubbles,

solid formed, color change,

etc.)

From this observation I

can infer the presence of :

( i.e. name a specific

element or ion, or category

of elements or ions)

AgNO

(aq)

White precipitates

Presence of halides

HCl (aq)

Effervescence

Presence of CO

ions

4. Based on the equations you have written and on the solubility rules, explain whether or

not the positive and negative results seem reasonable for AgNO

test. Do you have any

results that do not seem consistent with the reactivity guidelines and solubility rules?

The results are reasonable. The presence of white precipitates indicates there is

halides. Absence of white precipitates signifies absence of halides. All the results were

consistent as per the reactivity rules.

5. Explain whether or not the positive and negative results seem reasonable for HCl test. Do

you have any results that do not seem consistent with the reactivity guidelines and

solubility rules?

Both positive and negative results were reasonable. All carbonates produced bubbles

when they were reacted with HCl while the rest did not.

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CHEMICAL REACTIONS DISCOVERY EXPERIMENT 1. At the beginning of the semester, you performed two different qualitative analysis tests on a set of solutions: a) 0.1 M AgNO3 (aq), and b) 1 M HCl (aq). Use your data/ results from Experiments #1 to complete this table. Table 3 Which chemicals Which chemicals did Which chemicals did Which chemicals did Reacted with not react with not react with not react with AgNO3 (aq)? AgNO3 (aq)? HCl (aq)? HCl (aq)? (a “negative” test) (a “negative” test) (a “negative” test) (a “positive” test) NaCl, LiCl, BaCl2, Ca(NO3 )2 K2CO3, Na2CO3, K2CO3, Na2CO3, Li2CO3 KBr NaCl, LiCl, BaCl2 Ca(NO3)2 , KBr Ba(NO3)2, The observation was White precipitates apart from KBr The solution which produced remained clear Formation of bubbles. yellow precipitates. 2. In the context of that experiment, what was each testing for? AgNO3 (a ...
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