Question

How do I find the concentration of diluted unknown when the y=0.2025x+0.001 and the r2 value is 0.9998

Answer #1

Suppose Y-axis represents the absorbance of known compound and X-axis represents the concentration of the known compound.

Now take the unknown sample and find out the absorbance using photometer and then see the respective concentration that is the concentration of your unknown solution.

For example, suppose the absorbance of unknown compound come to 0.811 so the corresponding concentration from the graph is 4 and hence 4 is the concentration of the unknown solution.

The concentration of HCl when released to the stomach cavity is
diluted to between 0.01 and 0.001 M.
How many grams of NaHCO3 are required to neutralize 14.0 mL of a
solution having a pH of 1.8? (Express your answer with the
appropriate units.)

How do I show that a set inequality in R2 containing both x and
y is open?
Ex: 3 < x^2 + y^2 < 9

How do I find the weight precent iron (II)?
We measured 1.0014 g of unknown iron sample and added 100.0 mL
water. Then pipetted 10.00 mL of the first solution into a beaker
and added 90.00 mL of water. Then added 1,000 microliters of the
second solution to a plastic container along with the reagents
needed to analyze it with a spectrophotmeter. This solutions total
volume was 10.00 mL. I then measured the absorbance of this
solution and got .019...

How do you calculate the molecular weight of an unknown salt
given the concentration and known mass?
Unknown starting mass: 0.0484g
Unknown concentration: 0.00552 mM

During the spectrophotometric analysis of an unknown, the
absorbance of a solution of unknown concentration is measured, and
the value is higher than the highest standard used to make the
standard curve. What should be done to make sure that the standard
curve can be used to determine the concentration of the
unknown?
A) Dilute the unknown so that it will have an absorbance within
the standard curve. Once the diluted unknown concentration is
determined, the full strength concentration can...

y = 505.51x - 995806
r2 = 0.9964
Find and state the value of r2, the
coefficient of determination, and r, the correlation coefficient.
Discuss your findings in a few sentences. Is r positive or
negative? Why? Is a line a good curve to fit to this data? Why or
why not? Is the linear relationship very strong, moderately strong,
weak, or nonexistent?
Choose a value of interest and use the line of best fit to make
an estimate or...

How do I find the slope and the y-intercept. The only
information I have is the plot and table.

Let d be the usual metric on R2. (a) Find d(x,y) when x = (3,−2)
and y = (−3,1). (b) Let x = (5,−1) and y = (−3,−5). Find a point z
in R2 such that d(x,y) = d(y,z) = d(x,z). (c) Sketch Br(a) when a =
(0,0) and r = 1. The Euclidean metric is by no means the only
metric on Rn which is useful. Two more examples follow (9.2.10 and
9.2.12).

How do I find the level of confidence when not given one?

How do I find a decay rate constant(K) and ultimate
BOD if all I am given are the temperature, ml of solution, initial
and the final DO of two samples after 7 days. (One diluted one
not).

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