SPOT TEST OBSERVATION MATRIX Reagent K.Cro, KSCN NH,OH DMG HCI H,SO, Yellow Clear Clear precipitate No precipitate precipitate No precipitate No reaction precipitate Clear White White Pb(NO,), Orange Dark red Faint orange Clear Clear Clear Fe(NO,), precipitate No precipitate precipitate No reaction No precipitate No precipitate Clear precipitate No precipitate No reaction Yellow no Clear Pink solution Cream White Ni(NO,), solution precipitate No reaction Reddish White Faintly milky white precipitate Clear White No precipitate precipitate precipitate Clear AGNO brownish precipitate precipitate • Clear light yellow No precipitate No precipitate No reaction No precipitate solution Opaque Clear Clear Clear White Ba(NO,), precipitate Undereach reagentindicate whathappened (if anything) when mixed with the metal ion shown on the left. Write balanced reactions to representwhat happenedineach spottest.

SPOT TEST OBSERVATION MATRIX Reagent K.Cro, KSCN NH,OH DMG HCI H,SO, Yellow Clear Clear precipitate No precipitate precipitate No precipitate No reaction precipitate Clear White White Pb(NO,), Orange Dark red Faint orange Clear Clear Clear Fe(NO,), precipitate No precipitate precipitate No reaction No precipitate No precipitate Clear precipitate No precipitate No reaction Yellow no Clear Pink solution Cream White Ni(NO,), solution precipitate No reaction Reddish White Faintly milky white precipitate Clear White No precipitate precipitate precipitate Clear AGNO brownish precipitate precipitate • Clear light yellow No precipitate No precipitate No reaction No precipitate solution Opaque Clear Clear Clear White Ba(NO,), precipitate Undereach reagentindicate whathappened (if anything) when mixed with the metal ion shown on the left. Write balanced reactions to representwhat happenedineach spottest.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

SPOT TEST OBSERVATION MATRIX
Reagent
K.Cro,
KSCN
NH,OH
DMG
HCI
H,SO,
Yellow
Clear
Clear
precipitate No precipitate precipitate No precipitate No reaction precipitate
Clear
White
White
Pb(NO,),
Orange
Dark red
Faint orange
Clear
Clear
Clear
Fe(NO,),
precipitate No precipitate precipitate No reaction No precipitate No precipitate
Clear
precipitate No precipitate No reaction
Yellow no
Clear
Pink solution
Cream
White
Ni(NO,),
solution
precipitate
No reaction
Reddish
White
Faintly milky
white
precipitate
Clear
White
No precipitate precipitate precipitate
Clear
AGNO
brownish
precipitate
precipitate
• Clear
light yellow No precipitate No precipitate No reaction No precipitate solution
Opaque
Clear
Clear
Clear
White
Ba(NO,),
precipitate
Undereach reagentindicate whathappened (if anything) when mixed with the metal
ion shown on the left.
Write balanced reactions to representwhat happenedineach spottest.

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= A 0.5099 g mixture of KCN (MW 65.116 g/mol) and NaCN (MW = 49.005 g/mol) was dissolved in water. AgNO, was added to the solution, precipitating all of the CN in solution as AgCN (MW : 133.886 g/mol). The dried precipitate weighed 1.184 g. Calculate the weight percent of KCN and NaCN in the original sample. KCN wt% = NaCN wt% = = % %
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suppose you have a solution that might contain any or all of the following cations: Cu2+, Ag+, Ba2+, and Mn2+. The addition of HBr cuases a precipitate to from. After the precipitate is separated by filtration, H2SO4 is added to the supernatant liquid, and another precipitate forms. Thsi precipitate is separated bu filtration and a solution of NaOH is added to the supernatant liquid until it si strongly alkaline. No precipitate is fromed.Which ions are present in each of the precipitates? Which cations are not present in the original solution?