Question

Create a lab precedure for the determination of iron in apple juice, and orange juice using the spectrophotometric technique

Answer #1

Experiment to determine Fe in apple/orange juice

Prepare standard solutions of Fe standard by mixing solutions of Fe3+ and NaSCN. The complex formed FeSCN2+ is analyzed specrophotometrically by observing the absorbance readings.

Plot a calibration curve. Find molar absorptivity of FeSCN2+.

Now take apple juiceorange juice and add known concentration f NaSCN to it. Complex formed is measured by absorbance readings.

Using, calibration curve, calculate the Fe concetration in the juice.

2. Suppose apple juice is a substitute good for orange
juice.
a. Graph a Supply and Demand curve for orange
juice. Label the equilibrium as P* and Q*.
b. Now suppose the price of apple juice decreases. In the above
graph, show the resulting shift that would occur in the market for
orange juice.
c. At the original price P*, would there now be excess demand or
excess supply?
d. Would this cause the price of orange juice to increase...

This is about a chemistry lab for finding Na+ in apple juice.
The claim apple juice for Na+ is 30g. mg Na per serving should be
around 30 g.
Do calulation to fill out this table. sample mL will have to be
convert to g.
The standard solution equation is 0.503*x+0.0914. Find x not
y.
Sample
Sample use (mL)
Absorbance
[Na+] (ppm)
Na weight in sample (g)
mg Na per serving
Juice 1
2mL
0.324
Juice 2
2mL
0.391
Juice...

Determining vitamin c lab
For two samples which were apple juice and lime juice. Did not
extract because foods were liquids. Titrated with DCIP.
Titration for apple juice was total amount of DCIP
10.33ml.
How do I set up this problem to get vitamin c per ml
solution???
Also standard titration of DCIP was 2.5 mg vitamin c / 13.38
ml DCIP= 0.187 mg vit c/ ml DCIP

An ice chess contains four cans of apple juice, eight cans of
grape juice, six cans of orange juice, and five cans of pineapple
juice. Suppose that you reach into the container and randomly
select three cans in succession. Find the probability of selecting
no orange juice.

An ice chest contains 8 cans of apple juice, 7 cans of grape
juice, 6 cans of orange juice, and 2 cans of pineapple juice.
Suppose that you reach into the container and randomly select three
cans in succession. Find the probability of selecting no grape
juice.

Orange juice concentrate is made by concentrating
single-strength juice to 65% solids followed by dilution of the
concentrate to 45% solids using single-strength juice. Draw a
diagram for the system and set up mass balances for the whole
system and for as many subsystems as possible.

In one hand you hold a 0.13-kg apple, in the other hand a
0.25-kg orange. The apple and orange are separated by 0.88 m.
A. What is the magnitude of the force of gravity that the orange
exerts on the apple? Express your answer using two significant
figures.
B. What is the magnitude of the force of gravity that the apple
exerts on the orange? Express your answer using two significant
figures.

what is the purpose of the fermentation lab in yeast using fruit
juice? what would be the hypothesis, the dependent variable, and
the independent variable?

A 125 mL sample of orange juice was titrated using a redox
reaction to the equivalence point with the addition of 7.6 mL of a
0.0025M iodine (I2) solution. What is the concentration of vitamin
C (C6H8O6) in this sample? C6H8O6(aq) + I2(aq) ® C6H6O6(aq) +
2I–(aq) + 2H+(aq)

An employee at an orange juice factory is concerned that the
machine is under-filling bottles that are supposed to contain
500mL. A random sample of 15 containers is therefore taken and the
volume in each recorded in the file file below. In researching the
problem the employee sees a statement in the machine’s manual that
“juice machine follows a normal distribution”.
(a) Write down the null and alternate hypothesis.
(b) Say why the statement in the manual is important to...

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