Macmillan LearningThe selenium content in soil can be determined fluorometrically upon conversion ofthe selenium to the fluorescent product shown, followed by extraction in cyclohexane.Emission from the fluorescent product is observed at 518 nm.aThe selenium content in a 0.147 g soil sample was converted to the fluorescent productand extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in thesoil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several smalladditions of a 2.66 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in thecuvette. The fluorescence was measured at 518 nm. The results are shown in the table.Total added Se standardvolume (µl)0.0020.040.060.080.0Se wt% =50625Fluorescence intensity(arbitrary units)Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent ofselenium. Report the weight percent and absolute uncertainty with three significant figures.Incorrect54.3164.576.791.1108.3.0021SeIncorrect88

Given: To Calculate: weight percent Se in the soil and the absolute uncertainty in the weight…

Answered: The selenium content in soil can be…

Science

Chemistry

The selenium content in soil can be determined fluora

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Q: Why would a shortage of a reactant cause MORE production of the product?

A: Le Chatelier's principle explains how chemical systems at equilibrium respond to changes in factors…

Q: Consider the unbalanced chemical equation for the reaction which is used to determine blood alcohol…

A: Balancing of chemical equation follows the law of conservation of atoms. Balancing of chemical…

Q: The oxidation number of Cl in HClO₂ is

Q: Imagine you were working as a laboratory technician and your principal investigator asked you to…

Q: Balance the equation for the reaction of aluminum metal with solid iodine to form solid aluminum…

A: According to the law of conservation of mass, It can never be created neither be destroyed.

Q: The oxidation state of chlorine in manganese(III) chlorite is:

A: The oxidation state of chlorine in manganese(III) chlorite is calculated as follows:

Q: Determine the oxidation state for each of the elements below. The oxidation state of manganese in…

A: Answer:Formal charge on an atom present in a specie is called its oxidation number in that specie.

Q: balance this chemical reaction _____ C2H6O → ______ C2H4O + ______ H

A: Thus the cofficients are 1, 1, 1.

Q: An acid spill in a pond needs to be cleaned up with a base. a) Which chemical should be considered…

A: Given: An acid spill in a pond needs to be cleaned up with a base.

Q: copper (II) sulfate + zinc metal ----------> Reaction Type: Observations: Balanced Equation:

Q: What is the balanced chemical equation for the hydration of Iron(III) oxide to form rust?

A: Formation of rust is besically the hydration of Iron(III)oxide in the presence of moisture in the…

Q: 2) Iron corrodes in air. The reaction is represented by the chemical equation below: _Fe + Fe,O, a)…

Q: Aqueous osmium (II) chloride reacts with aqueous cesium carbonate to produce cesium chloride and…

Q: How many grams of product will be formed by completely burning 7.80 g of aluminum on excess oxygen?

Q: Nickel is more reactive than hydrogen, so it replaces hydrogen from hydrochloric acid when mixed…

A: Nickel is a metal and its symbol is NiThe formula of hydrochloric acid is →HClNickel is more…

Q: Consider the reaction when aqueous solutions of lead(II) nitrate and copper(II) sulfate are…

A: The objective of this question is to write the net ionic equation for the reaction between aqueous…

Q: Adipic acid is used in the production of nylon, so it is manufactured in large quantities. The most…

Q: 96. Aluminum is produced comi AlO, in the presence of a m tinuous capacity of 1.00 mil can be…

A: The reaction which is taking place here Al2O3+6e-+6H+→2Al+3H2O Given i =1 million Ampere Time= 2…

Q: 1.034g 5.2mL 6.5159 3,8479 24.7819 20.4989 Weight of Watch Glass, Filter Paper and CuCl Precipitate…

A: Given data : 1. Weight of Copper = 1.034 g 2. Weight of Watch Glass and Filter Paper = 24.781 g…

Q: After having performed a "collecting gas over water" experiment to determine the molar mass of zinc,…

A: Metals are considered as the most reactive elements of the periodic table. They are part of s, p, d…

Q: The oxidation number of the chlorine atom in ClO₂ is

A: The oxidation number of the chlorine atom in ClO₂ = +4.Explanation:Step 1:Let x be the oxidation…

Q: Balance the following reaction by choosing the correct coefficient that goes with each compound Y, →…

A: Unbalanced chemical reaction is, X8 + Y2 -------------> XY3 Inorder to balance this, first we…

Q: 9. Cu20 + O2 -----> CuO

A: Ans The given chemical equation Cu2O + O2 -------------------> CuO

Q: Balance the chemical reaction. ____MgCl2 + ____AgC2H3O2 ---> _____ Mg(C2H3O2)2 + _____…

A: MgCl2 + 2AgC2H3O2 ---> Mg(C2H3O2)2 + 2AgCl The coefficient for magnesium…

Question

Macmillan Learning
The selenium content in soil can be determined fluorometrically upon conversion of
the selenium to the fluorescent product shown, followed by extraction in cyclohexane.
Emission from the fluorescent product is observed at 518 nm.
a
The selenium content in a 0.147 g soil sample was converted to the fluorescent product
and extracted in 50.0 mL of cyclohexane. The method of standard additions was used to determine the selenium content in the
soil sample. Initially, 3.00 mL of the cyclohexane solution were placed in a cuvette for fluorescence determination. Several small
additions of a 2.66 µg Se/mL standard solution containing the fluorescent product were added to the 3.00 mL solution in the
cuvette. The fluorescence was measured at 518 nm. The results are shown in the table.
Total added Se standard
volume (µl)
0.00
20.0
40.0
60.0
80.0
Se wt% =
50625
Fluorescence intensity
(arbitrary units)
Determine the weight percent (wt%) of selenium in the soil sample and find the absolute uncertainty in the weight percent of
selenium. Report the weight percent and absolute uncertainty with three significant figures.
Incorrect
54.31
64.5
76.7
91.1
108.3
.0021
Se
Incorrect
88

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Step 7

Step 8

Step 9

Step 10

Trending now

This is a popular solution!

Step by step

Solved in 10 steps with 11 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

Imagine you were working as a laboratory technician and your principal investigator asked you to develop Benedict’s test into a quantitative measure of the concentration of reducing sugar in a solution. To do this, you would first need to decide what to measure and then establish the relationship between your measurements and different concentrations of reducing sugars. Explain generally what you would decide to measure and how you would go about determining the relationship of your measurements to the concentration of reducing sugar.
Complete and balance the following reactions - assume they all go a. hydrogen gas plus nitrogen gasb. potassium metal plus sulfur powderc. solid magnesium oxide plus water
Write a balance chemical equation for a test on generating gases of the following: Testing hydrogen gas and testing oxygen gas.
What changes occur when a coefficient is added to a set of molecules?
3. A student mixes 100.0 mL of a 0.100 M solution of potassium phosphate with 100.0 mL of a 0.125 M solution of copper (II) sulfate and obtains a blue solid. (a) Write the balanced chemical equation for the reaction including physical states. (b) Determine the limiting reagent. (c) Calculate the number of moles of the excess reagent after the reaction is completed. Record servation
A solution of zinc acetate and a piece of aluminum metal are mixed together in a test tube. For the following reaction, a) Determine the type of reaction, and bi) if the reaction occurs, write the balanced reaction, including all states of matter, or bii) if the reaction does not occur, explain why the reaction does not occur.
balance this chemical reaction _____- C2H4O + _____ O → ______C2H4O2
what is the balanced equation for Phosphorus triiodide is formed from elements?