When performing a REAGENT BLANK in chemistry, do you add
or subtract the volume of the blank determination from the volume
of titrant to get the corrected volume of titrant used? In this
particular experiment we are determining Ca2+ and Mg2+ in natural
water samples. And, do you always add or subtract the blank reagent
or does it change with reactions? Probably simple questions but
they have me completely stumped. Thanks!
Which reagent is the limiting reactant when 2.22 mol NaOH and
1.20 mol CO2 are allowed to react?
Which reagent is the limiting reactant when
2.22 and 1.20 are allowed to
react?
NaOH
CO2
Part B. How many moles of Na2CO3 can be produced?
Part C. How many moles of the excess reactant remain after the
completion of the reaction?
the synthesis of FeC2O4*2H2O, Which reagent would be the
limiting reagent? (NH4)2[Fe(H2O)6](SO4)2 IS 3.42g H2C2O4*2H2O is
1.98g 2. using your answers above, calculate the theoretical yield
(in grams) of potassium trioxalatofer-rate(iii) trihydrate,
K3[Fe(C2O4)3]*3H2O
What is the limiting reagent in esterification using isopentyl
alcohol and acetyl chloride to make isopentyl acetate? Prove your
answer with limiting reagent calculations.
Used 200 uL of isopentyl alcohol, 800 uL of acetyl chloride in
the experiment.
22 Pre-Lab Study Questions
What happens to glucose or galactose when the Cu2+ in
Benedict’s reagent is reduced?
Would you expect fructose or glucose to form a red color rapidly
with Seliwanoff’s reagent? Explain your answer.
Why don’t all the disaccharides undergo fermentation with
yeast?
How can the iodine test be used to distinguish between amylose
and glycogen?
A group of students, performing the same Uniformly Accelerated
Motion experiment that you did in lab, dropped a picket fence
through a photogate and obtained the following data from the
computer.
Blocking Times (s)
0.05206
0.08969
0.12076
0.14763
0.17203
0.19438
0.21502
The band spacing is 0.06 m.
(a) Use Excel to do the following. (You will not submit this
spreadsheet. However, the results will be needed later in this
problem.)
(i) Calculate the accelerations.
(ii) Calculate the average of the...
Calculate the theoretical and percent yield. What is the
limiting reagent?
Reaction: 4-bromoacetanilide from acetanilide in Br2 and
AcOH
4.27 g acetanilide
4.78 mL bromine solution
15.93 mL glacial acetic acid
product: 0.24 g 4-bromoacetanilide
In an experiment, why would the concentration of a sample
decrease when changing the wavelength for a spectrophotometer from
235 nm to 280 nm?
This is just a general question, I would like to know why the
absorbance peak would be higher at a wavelength of 235nm rather
than at 280nm. Is this normal? or could it an experimetnal
error?
What is meant by acceptable audit risk when performing the work
of attestation, and what would be some of the characteristics of
this risk?
What type of evidence is collected when substantiating this
type of audit risk, and why can this risk be material when
reviewing the financial statements of a company?