Sometimes a person will read the percent transmittance scale of a colorimeter rather than the absorbance...
Sometimes a person will read the percent transmittance scale of a colorimeter rather than the absorbance scale and then convert %T into "A." What value of "A" corresponds to each of the following: 10% T, 50% T, 90% T ?
Homework Answers
Add Answer to:
Sometimes a person will read the percent transmittance scale of
a colorimeter rather than the absorbance...
4. A colorimeter (or spectrophotometer) actually measures percent transmittance (%T), as described in the appendix, and...
4. A colorimeter (or spectrophotometer) actually measures percent transmittance (%T), as described in the appendix, and the LabQuest automatically converts that to absorbance. The relationship is logarithmic: Abs = 2 -log(%T) Imagine you have four solutions, and use the LabQuest to measure the absorbance of each one. You then convert to %T as below: Solution Absorbance % Transmittance W 0.250 56.23% 0.750 17.78% 2.250 0.562% Z 2.750 0.178% х Y Consider the sensitivity of the instrument. Do you think all...
If you use a Spec-20 with an analog scale you must read percent transmittance, and convert...
If you use a Spec-20 with an analog scale you must read percent transmittance, and convert your transmittance reading to absorbance. What is the absorbance of a solution that transmits 100% of the light shining on it? What is the absorbance of a solution that transmits 5.0% of the light? What is the absorbance of a solution that transmits 0% of the light shining on it?
What absorbance value corresponds to 47.3% T'? A = A 0.0150 M solution of a certain...
What absorbance value corresponds to 47.3% T'? A = A 0.0150 M solution of a certain analyte exhibits 47.3% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0250 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
What absorbance value corresponds to 47.1% T? A 0.0188 M solution of a certain analyte exhibits...
What absorbance value corresponds to 47.1% T? A 0.0188 M solution of a certain analyte exhibits 47.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0281 M solution of the same analyte? Assume the pathlengths for each measurement are equal.
What absorbance value corresponds to 41.1% T? .386 A 0.0142 M solution of a certain analyte...
What absorbance value corresponds to 41.1% T? .386 A 0.0142 M solution of a certain analyte exhibits 41.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0284 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T
What absorbance value corresponds to 41.8% T? A = A 0.0110 M solution of a certain analyte exhibits 41.8% T at a wavele...
What absorbance value corresponds to 41.8% T? A = A 0.0110 M solution of a certain analyte exhibits 41.8% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0299 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
answers for this pre/post lab Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species...
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1?...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1? How fast would a country have to be growing in order to double its output in nine years? You should aswer this question using the rule of 72, not a calculator. 3. Suppose that in a particular country, GDP per capita was $1,000 in 1900 and $4,000 in 1948. Using the rule of 72 (not a calculator), approximate the annual growth rate of GDP...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1?...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1? 2. How fast would a country have to be growing in order to double its output in nine years? You should answer this question using the rule of 72, not calculator 3. Suppose that in a particular country, GDP per capita was $1,000 in 1900 and $4,000 in 1948. Using the rule of 72 (not a calculator), approximate the annual growth rate of GDP...
question 4 1. A distribution has a standard deviation of a = 12 points. Find the...
question 4
1. A distribution has a standard deviation of a = 12 points. Find the 2-score for each of the following locations in a distribution by sketching a distribution (do not use an equation). (4 points) a. Above the mean by 4 points b. Below the mean by 6 points c. Below the mean by 18 points 2. A distribution has a standard deviation of a = 5 and u = 30. Find the score for each of the...
4. A colorimeter (or spectrophotometer) actually measures percent transmittance (%T), as described in the appendix, and the LabQuest automatically converts that to absorbance. The relationship is logarithmic: Abs = 2 -log(%T) Imagine you have four solutions, and use the LabQuest to measure the absorbance of each one. You then convert to %T as below: Solution Absorbance % Transmittance W 0.250 56.23% 0.750 17.78% 2.250 0.562% Z 2.750 0.178% х Y Consider the sensitivity of the instrument. Do you think all...
What absorbance value corresponds to 47.3% T'? A = A 0.0150 M solution of a certain analyte exhibits 47.3% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0250 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
What absorbance value corresponds to 47.1% T? A 0.0188 M solution of a certain analyte exhibits 47.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0281 M solution of the same analyte? Assume the pathlengths for each measurement are equal.
What absorbance value corresponds to 41.1% T? .386 A 0.0142 M solution of a certain analyte exhibits 41.1% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0284 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T
What absorbance value corresponds to 41.8% T? A = A 0.0110 M solution of a certain analyte exhibits 41.8% T at a wavelength of 280 nm. What will the percent transmittance be for a 0.0299 M solution of the same analyte? Assume the pathlengths for each measurement are equal. %T =
answers for this pre/post lab
Name: Date: Lab Section Colorimetric Pre/Postlab Questions 1. What iron species give rise to the orange color upon addition of 1,10-phenanthroline to an iron(II) solution? 2. How are percent transmittance and absorbance related algebraically? (Be able to convert %T to 4 and 4 to %7:) 3. What are the five fundamental components of a spectrophotometer? 4. State and define all terms (including units) in the Beer-Lambert law. 5. What is the purpose of preparing a...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1? How fast would a country have to be growing in order to double its output in nine years? You should aswer this question using the rule of 72, not a calculator. 3. Suppose that in a particular country, GDP per capita was $1,000 in 1900 and $4,000 in 1948. Using the rule of 72 (not a calculator), approximate the annual growth rate of GDP...
PROBLEMS 1. How would using a ratio scale (rather than a linear scale) affect Figure 1.1? 2. How fast would a country have to be growing in order to double its output in nine years? You should answer this question using the rule of 72, not calculator 3. Suppose that in a particular country, GDP per capita was $1,000 in 1900 and $4,000 in 1948. Using the rule of 72 (not a calculator), approximate the annual growth rate of GDP...
question 4
1. A distribution has a standard deviation of a = 12 points. Find the 2-score for each of the following locations in a distribution by sketching a distribution (do not use an equation). (4 points) a. Above the mean by 4 points b. Below the mean by 6 points c. Below the mean by 18 points 2. A distribution has a standard deviation of a = 5 and u = 30. Find the score for each of the...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago