Question
In: Chemistry
A student performed the Separation by Fractional Crystallization experiment described with the following results: Initial mass...
A student performed the Separation by Fractional Crystallization experiment described with the following results: Initial mass of sample mixture: 5.692 g, mass of salicylic acid recovered, 1.09 g; mass of CuSO4•5H2O recovered, 3.78 g. The recovered CuSO4•5H2O was then heated for 20 minutes at 120 °C. The mass of the new hydrate was 2.55 g. (The molar mass of H2O = 18.015 g/mol, and the molar mass of CuSO4= 159.61 g/mol) Calculate the moles of water in the new hydrate (CuSO4•XH2O).
Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
A student performed the experiment described in this module. The 5.00-mL mass of the 2.15% percent...
A student performed the experiment described in this module. The
5.00-mL mass of the 2.15% percent by mass H2O2 solution used was
5.03 g. The water temperature was 23 C, and the barometric pressure
was 31.2 in. Hg. After the student immersed the yeast in the
peroxide solution, she observed a 38.60-mL volume change in system
volume.
(h) Calculate the mass of 5.00 mL of the H2O2 solution.
(i) Calculate the mass of H2O2 in 5.00 mL of the solution....
An experiment about the gender success in Math courses is performed and the following results are...
An experiment about the gender success in Math courses is
performed and the following results are obtained. 150 out of 270
male participants could get a grade above 50. On the other hand 135
out of 228 female participants obtained a score above 50. Design
and perform a test to see if the difference is statistically
significant.
A student researcher performed a chromatographic separation of caffeine and aspartame with methanol as the mobile...
A student researcher performed a chromatographic separation of
caffeine and aspartame with methanol as the mobile phase using a
C–18 column. The retention times for methanol ( t m ) , caffeine (
t c ) , and aspartame ( t a ) were 35.9 s , 103.5 s , and 179.6 s ,
respectively.
What is the selectivity factor (relative retention), α , for
this column?
Calculate the hypothetical retention times for caffeine and
aspartame if their retention factors...
A student researcher performed a chromatographic separation of caffeine and aspartame with methanol as the mobile...
A student researcher performed a chromatographic separation of
caffeine and aspartame with methanol as the mobile phase using a
C–18 column. The retention times for methanol (tm) , caffeine (tc)
, and aspartame (ta) were 41.8 s , 96.3 s , and 143.8 s ,
respectively.
What is the selectivity factor (relative retention), α , for
this column?
α=
Calculate the hypothetical retention times for caffeine and
aspartame if their retention factors were reduced by 28.0% . Assume
the mobile...
A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine,...
A student researcher performed a chromatographic separation of
caffeine and aspartame. The retention time for caffeine, t c , was
found to be 201.4 s with a baseline peak width, w c , of 13.8 s.
The retention time for aspartame, t a , was 265.0 s with a baseline
peak width, w a , of 21.4 s. The retention time for the unretained
solvent methanol was 40.9 s.
Calculate the average plate height, H , in micrometers for this...
Separation techniques were performed on a sample containing only sand and salt. The mass of the...
Separation techniques were performed on a sample containing only
sand and salt. The mass of the initial sample was 10.50 g. After
the separation, 3.10 g of sand and 4.00 g of salt were recovered.
What is the percent recovery of sand and salt?
1.Following the general procedure described in this experiment , a student synthesized 6.895 g of barium...
1.Following the general procedure described in this experiment ,
a student synthesized 6.895 g of barium idoate monhydrate, Ba(IO3)2
. H2), by adding 30.00 mL of 5.912x10^(-1) M barium nitrate,
Ba(NO3)2, to 50.00 mL of 9.004x10^(-1) M sodium idoate, NaIO3.
(A) Write the chemical equation for the reaction of solutions of
barium nitrate and sodium iodate.
(B) Calculate the precent yield of barium iodate monohydrate the
student obtaned in this experiment.
When reviewing the procedure and calculations, the student
discovered...
A student performed an experiment similar to the one that you will perform, but using different...
A student performed an experiment similar to the one that you
will perform, but using different solutions from the ones that you
will use. The student's data are presented in Table 4 below.
1.) Is a 0.1 M solution of NaNO2 acidic or basic?
2.) What experimental evidence supports your answer?
3.) List the solutions studied by the student that are
basic.
4.) What experimental evidence supports your answer?
Table 4 Student data for estimating the PH of
solutins
...
In a similar experiment to the one you have performed a student is measuring the equilibrium...
In a similar experiment to the one you have performed a student
is measuring the equilibrium for an organic acid that is soluble in
water and in cyclohexane, a nonpolar organic solvent. When shaken
with the solution of water and cyclohexane, it distributes between
the organic and aqueous phase. The two phases are separated and
titrated with 0.12 M NaOH. Calculate the equilibrium constant for
an acid where the titration of the aqueous phase requires 9.9 mL of
the base...
1) The results you predict as a result of a controlled experiment can be described as...
1) The results you predict as a result of a controlled
experiment can be described as an hypothesis, such as “selection of
Wisconsin Fast Plants with the most trichomes in the first (parent)
generation will result in an increase in trichome number in the
plants of the second generation.” You are making a prediction based
on scientific knowledge of selection, and are able to quantify the
number of trichomes. This is your experimental hypothesis. A null
hypothesis for your experiment...
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