An Introduction to Qualitative Research

 An Introduction to Qualitative Evaluation Research Newspaper

п»їAn Summary of Qualitative Analysis

Purpose: В

Assessments the ions of Mg2+, Ca2+, Sr2+, and Ba2+, В

and identify all of them separately. By making use of theseВ

findings, identify the unknown ion. Then testsВ

the ions of SO42-, CO32-, Cl-, and I-, identify these people separately, and use the remark to identify the unknown. В

Procedure

Part I -В QualitativeВ Analysis of Group two ElementsВ

Combine 0. 02M K2CrO4 with each Mg(NO3)2, Ca(NO3)2, Sr(NO3)2 andВ Ba(NO3)2 together. Subsequently, mix zero. 1M (NH4)2C2O4 instead of zero. 02M K2CrO4В together with the same reactants used before. Third, mix 0. 1M Na2SO4В with those reactants. Then, mix 0. 1M NaOH with the same reactants used prior to again. A lot of precipitates will need to forms, record the findings in Stand 1 . Now, identifyВ those two unknown answer.

Component II- Qualitative Analysis of Selected AnionsВ

First blend 1M HNO3 with every single Na2CO3, Na2SO4, NaCl and NaI jointly. В Do it again these steps byВ placingВ 0. 1M Ba(NO3)2 instead of 1M HNO3. ThenВ mix 1M HNO3 to get the reactants that shaped precipitates. Replicate the firstВ step by simply placing 0. 1M AgNO3 instead of 1M HNO3. Then add 6M NH3 to the people mixtures which has precipitates in, and 1M HNO3 the mixtures contains precipitates. Applying these remark, identify a mysterious union. Saving all the findings inВ Table 2 . В

Data and Observations: В

Part I -Qualitative Examination of Group 2 ElementsВ

Table 1В

REAGENTS

0. 1M ALTERNATIVES OF GROUP 2 CATIONS (AS NITRATES)В

Mg2+

Ca2+В

Sr2+В

Ba2+В

UnknownВ D

0. 02M K2CrO4

no

not any

Light ppt

Light ppt(yellow)

No

0. 1M (NH4)2C2O4В

no

Large ppt(white)

Heavy ppt(white)

Lumination ppt(white)

Heavy ppt(white)

0. 1M Na2SO4

no

no

Light ppt

Light ppt(white)

no

zero. 1M NaOH

Light ppt

Light ppt

no

Mild ppt(white)

Lumination ppt(white)

Component II- Qualitative Analysis of Selected AnionsВ

Table 2В

REAGENTS

0. 1M SOLUTIONS OF GROUP 2 CATIONS (AS Mhh SALTS)

CO32-В

SO42-В

Cl-В

I-В

UnknownВ Z

1M HNO3

Bubble

Zero

Zero

Zero

Not any

zero. 1M Ba(NO3)2В

heavy pptВ

immediatelyВ

weighty pptВ

immediatelyВ

No

No

heavy pptВ

immediatelyВ

zero. 1M HNO3 added to aboveВ

ppt disappearsВ

immediatelyВ

ppt disappearsВ

immediatelyВ

No

No

ppt disappearsВ

immediatelyВ

zero. 1M AgNO3

heavy pptВ (light yellow)immediatelyВ

Simply no

hefty pptВ (light yellow)immediately

heavy pptВ (light yellow)immediately

no

1M HNO3 added to aboveВ

ppt disappearsВ

immediatelyВ

No

ppt partially disappearsВ

immediatelyВ

ppt partially disappearsВ

(yellow)В

right away

No

6M NH3 added to precipitates from AgNO3В

light pptВ

(yellow)В

immediately

light pptВ

(yellow)В

quickly

light pptВ

(yellow)В

immediatelyВ

light pptВ

(yellow)В

immediatelyВ

light ppt (yellow)В

immediatelyВ

Questions: В

Part one particular: В

1 . Write net ionic equations for each combination in which aВ precipitate took place. В

Sr2+(aq)+ CrO42-(aq) пјќ SrCrO4(s)В

Ba2+(aq)+CrO42-(aq) пјќ BaCrO4(s)В

Ca2+(aq)+ C2O42-(aq) пјќ CaC2O4(s)В

Sr2+(aq)+ C2O42-(aq) пјќ SrC2O4(s)В

Ba2+(aq)+C2O42- (aq) пјќ BaC2O4(s)В

Sr2+(aq)+SO42-(aq) пјќ SrSO4(s)В

Ba2+(aq)+ SO42-(aq) пјќ BaSO4(s)В

Mg2+(aq)+ 2OH-(aq) пјќMg(OH)2(s)В

Ca2+(aq)+ 2OH-(aq) пјќ Ca(OH)2(s)В

Ba2+(aq)+SO42-(aq) пјќ BaSO4(s)В

installment payments on your State the identity of the unknown (along with its sampleВ number). Give the reasoning you used to reach this conclusion. В

From your observation, Unknown D needs to be Ca2+ as it has a sameВ property while Ca2+ truly does. By the statement in table 1, we know that Ca2+В varieties ppt with C2O42- and OH-. The unknown anions forms ppt with C2O42-В and OH- as well, as a result we determine that the unidentified cation shouldВ be Ca2+. В

Portion 2: В

1 . Publish net ionic equations for every single combination through which aВ medicine formed yet another reaction occurred. В

Ba2+(aq)+ CO32-(aq)пјќBaCO3(s)В

Ba2+(aq)+ SO42-(aq) пјќBaSO4(s)В

2Ag+(aq)+ CO32-(aq) пјќ Ag2CO3(s)В

Ag+(aq)+ Cl-(aq) пјќ AgCl(s)В

Ag+(aq)+ I-(aq) пјќAgI(s)В

installment payments on your Write net ionic equations for each condition in...

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