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# Hi, I just want someone to check my work and to explain further. We did the experiment about the spectral analysis

III. Data Analysis: Absorbance of Standard Cuz+(aq) Solutions
A Find a notes
B.
In part L.D you speculated on what reaction occurs when copper (IT) sulfate reacts with potassium
hydroxide. How can the data on page 37 be used to confirm or deny this reaction? Below, show
calculations for your two reaction solutions. Do the data from other students fit this logic as well?
Briefly explain your reasoning using numbers.
The data collected can be used to confirm this reaction because the amount
of moles for the reactants side and products side are equivalent; therefore
the reaction is balanced and can be used to confirm this reaction.
Cus04 (ag) + KOH (ag) - Cu (OH) 2 +K 2804
0.016 9 mol
0. 0169 mol
0.0128 mol
0. 0128 mol
( 0 . 016 9 Mol KOH ) ( 1
1 mol K2soy
I mol KOH
= 0. 0169 mol K280 4
I mol K280y
( 0.0128 mol KOH ) ( I mol KOH
0.0128 mol KOH
The data from other students do fit this logic as well because their
balanced equation is the same as the balanced equation that I observed;
therefore, their data too can be used to confirmed this reaction.
V. Conclusions
Summarize the data for and against the chemical equation you wrote for copper (II) sulfate reacting with
potassium hydroxide. In particular, explain how spectroscopic data can be used as evidence for a given
reaction idea. Finally, do you feel your equation reflects what nature is really doing? Briefly explain.
In the chemical reaction between copper ( II ) sulfate and potassium
hydroxide, a double-replacement reaction occurred, thus producing copper ( II) hydroxide
and potassium sulfate. spectroscopic data can be used to identify pure substances
or compounds and the elements in them because each
natural element has a
characteristic light spectrum that assists in the identification of unknown substances.
My equation does reflect what nature is really doing because a
double replacement reaction occurred where
A B
In this case, copper (II) sulfate became copper ( II) hydroxide and potassium
hydroxide became potassium sulfate.
40

Find a patter
solutions. It may be helpful to graph the data. Find an algebraic equation that expresses this
) Gust (ag)
work below.
pattern, evaluate all constants. in your equation and determine their units, Show and explain your
Concentration VS. absomakes
( . 12 , . 211 ) + (.45,. 422)
of
m = = 412 - . 7-11 = 64
concentration
400-
( -45 ,- 42.2)
.45 - -12
bzy, - (m) (x, )
curt ( m )
(36 ,-351 )
30 0-
b = . 211 - (.64 ) (- 12 )
( 23, - 751)
b = - 134
-12 )
200
y =. 64 x +. 134
- 2
absorbernce
- 4
1. 5x
@ 620 nm
(unitless )
This graph represents a positive relationship between the
Concentration of cult (M) and the absonance at 620 rim.
The eaviation that represents this raationship is y=. 64 x +6134.
B.
Mental Model-Draw pictures showing what happens when light of 620 nm is passed through a Cut
solution. Show a contrast between low- and high-concentration solutions to explain the pattern you
found in part III.A.
Fine
. 42 2m curt
stage after
. 4 2 .
cubsonance
122
38

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