How to eliminate chloride interference up to the COD test?

12,903 results
  1. CHM 152

    At 20oC, a 2.32 M aqueous solution of Ammonium Chloride has a density of 1.0344g/ml. WHat is the molality of Ammonium Chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol?? I am not sure how to incorporate the density into the problem to

  2. geometry

    find the value value of X m

  3. mathematics

    Jake correctly answered 15 out of 25 questions in Test 1 and 18 out of 25 questions on test 2. On Test 3 he missed 5 out of 27 questions. Which test had the best score? A) Test 2 and Test 3 B) Test 2 C) Test 3 D) Test 1 ??

  4. chemistry

    What is the number of unpaired electrons for the following compounds: Cobalt (II) chloride Copper (II) chloride Iron (II) chloride Manganese (II) chloride Nickel (II) chloride Zinc chloride I don't know how to do this

  5. geometry

    The angle of depression from the top of a lighthouse to a boat in the water is 30°. If the lighthouse is 89 feet tall how far is the boat from the lighthouse to the nearest foot? Answers available in ... 10Take this time to do your best on this question.

  6. physics

    Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between

  7. English

    1) The tea was cold, the fire was dead; What figurative language is this? A)assonance Eliminate B)onomatopoeia C)alliteration D)internal rhyme 2) Which stylistic or literary device is used in the line: ‘Sick with a fear that had no form? A)simile and

  8. chem

    If 50.0 mL of a 0.10M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar concentration of chloride in the resulting solution?

  9. chemistry

    Aluminum nitrate and ammonium chloride react to form alluminum chloride, nitrogen, and water. what mass of aluminum chloride is present after 43.0 g of aluminum nitrate and 43.0 g ammonium chloride have reacted completely? Please Help

  10. chem

    if ferric chloride was added to an unknown which happened to be benzophenone to identify if it has the phenol functional grp...will the sol'n turn purple (it contains the phenol) or yellow(does not contain phenol)? Benzophenone is a ketone and ketones

  11. Chemistry

    24. Identify a source of error for the experimental design of the cobalt(II)chloride system In the experiment, there were three test tubes. All of them contained cobalt(II)chloride. Test tube 1 was the constant, therefore, did not change throughout the

  12. Physics. URGENT Help Please

    What is the separation of colors in a rainbow produced by? (Points : 1) different diffraction for different wavelengths different interference for different wavelengths

  13. college physics 2

    A double-slit diffraction pattern is formed on a distant screen. If the separation between the slits decreases, what happens to the distance between interference fringes? Assume the angles involved remain small. A double-slit diffraction pattern is formed

  14. math

    Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. a.-(n+4) to eliminate the parentheses b. 6(-s) to eliminate the parentheses c. 8(24-n) to eliminate the parentheses

  15. Chemistry

    25.0 mL of a NaCl solution (concentration unknown) was found to react with 20 drops of the chloride test solution from the PU Chloride Test Kit. Calculate the mass of NaCl (in grams) in this solution. Calculate the mass of NaCl required to prepare 0.250 L

  16. chemistry

    Cobalt Chloride forms pink crystals.When they are heated,water is evolved and they turn blue. .Explain how we could use Cobalt Chloride as a test for water??

  17. biochemistry

    for each of these qualitative test,barfoed test,benedict test,seliwanoff test,bial test,molisch test,and iodine test, describe the class and give aspecific example of a carbohydrate that would yield a posiyive result?

  18. Pre-Calculus Help?

    A class is to eliminate t from the parametric equations x = t^2 + 3 and y = 4t. Beth says that she can write t = sqrt (x-3) to eliminate the parameter. Why is this wrong? A) She should have added 3 to x, not subtracted B) She should always solve for t as a

  19. Help with Psychology Homework

    Your professor asks you to take a personality test. After taking the test, you read your description of your personality type, and are disappointed that the results do not seem to capture your personality at all. In fact, you think the test probably

  20. College Chemistry

    In this lab: we demonstrated the method of evaporation of a saturated sodium chloride solution. The following question ask: 1) why is sodium chloride chosen for the solute? 2)Suggest reasons why the following were not chosen for the solute? a)Calcium

  21. Math

    Lower and upper confidence interval estimate ahead of two months for cod catch (no trend in cod catch but it is changing slowly) for smoothing constant á=0.225 was found 300 and 477.12 tons. If the estimate of ó2 from the monthly catch of two years is

  22. Maths

    In a sector COD of a circle, centre O , in which angle COD =4/3 radians. The points A and B lie on the OD and OC respectively, and AB is an arc of a circle, centre O, of radius 7cm. Given that the area of the shaded region ABCD is 48cm^2. Find the

  23. year 7 science

    what gas is made from hydrochloride and zinc? Is it zinc chloride? how to test for zinc chloride what experiment to do . thanks i`m stuck on these questions . not very good at science!

  24. Chemistry

    An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537 cm-1. (a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer (refractive index of 1.34)? (b) What

  25. statistics

    In a local cellular phone area, company A accounts for 70% of the cellular phone market, while company B accounts for the remaining 30% of the market. Of the cellular calls made with company A 2% of the calls will have some sort of interference, while 3%

  26. English

    prepositional phrase? Appositive phrase? Participial phrase? Gerund phrase? infinitive phrase? Absolute phrase? Cape Code, a heavily settled peninsula southeast of Boston, has an interesting history. What is “a heavily settled peninsula southeast of

  27. Physics

    Hi guys hope someone here can maybe help me out. Two loudspeakers are placed at either end of a gymnasium, both pointing toward the center of the gym and equidistant from it. The speakers emit 286 Hz sound that is in phase. An observer at the center of the

  28. Chemistry

    What happens if ammonium chloride is heated in a test-tube with a long neck?

  29. chemistry

    Iron forms two chlorides.One gram of the first chloride produces 2.26g of silver chloride and one gram of the second chloride produces 2.65g of silver chloride.Prove that these data illustrate the law of multiple proportions

  30. Math

    Alyssa has 4.5 eliminate to pour into preachers he's pictures hold 0.9 eliminate if it is important that you come out eliminate into each picture how many pieces does she fill

  31. physics

    Fill in blank: Two slits can produce an interference pattern with visible light but this maximal point of constructive interference can be made more pronounced by using many fine lines in a __________

  32. math

    Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. a. –(n + 4), to eliminate the parentheses b. 6(-s), to eliminate the parentheses c. 8(24 – n), to eliminate the

  33. math

    Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. a. –(n + 4), to eliminate the parentheses b. 6(-s), to eliminate the parentheses c. 8(24 – n), to eliminate the

  34. Chemistry

    How can I rank these substrates from fastest to slowest reacting? In an SN2 reaction with NaI-Acetone? Based on theory alone? benzyl chloride n-butyl bromide n-butyl chloride sec-butyl chloride tert-butyl chloride

  35. chemistry

    Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen

  36. chemistry

    Write and balance each of the following equations, and then identify each by type. a) copper+chlorine-->copper(ll)chloride b) calcium chlorate--->calcium chloride+oxygen c)lithium+water--->lithium hydroxide+hydrogen

  37. chemistry.

    How many grams of sodium chloride are there in 55.00 Ml of a 1.90 M aqueous solution of sodium chloride? any idea. 2. What is the concentration of chloride ions in a 0.193 M solution of potassium chloride?..heeeeeeeeeeeelp.

  38. Chemistry

    In the test for chloride ion why is it necessary to acidify with hno3

  39. Physics - Hydrogen Emission spectrum

    a) Describe the emission spectrum of a hydrogen discharge tube b) Explain why different color lines appeared in different position in the spectrum. Use a suitable atomic model to help construct your answer. c) Explain how do you decide if the lines

  40. physics

    Radio waves of frequency 30 kHz are received at a location 1500 km from a transmitter. The radio reception temporarily “fades” due to destructive interference between the waves travelling parallel to the ground and the waves reflected from a layer

  41. science

    How to eliminate chloride interference up to the COD test?

  42. Global Studies

    Although fish is the Atlantic provinces' most abundant natural resource, what caused cod fishing to be banned throughout Canada in 2003? a. A disease killed all the cod b. People stopped eating cod c. Gas-powdered fishing boats were outlawed first d.

  43. math

    About 310 000 t of Alantic cod were caught in 1991. In 2001, the mass of cod caught was 87 percent less. How much cod was caught in 2001 ? and how do you find the answer?

  44. PRE ALGEBRA

    THE AVERAGE WEIGHT W (IN POUNDS) OF AN ATLANTIC COD AGED t YEARS CAN BE MODELED BY THE EGUATION W=1.16(1.44)^t. FIND THE RATIO OF THE WEIGHT OF A 5 YEAR OLD COD TO THE WEIGHT OF A 2 YEAR OLD COD. EXPRESS THIS RATIO AS A POWER OF 1.44!!!!!! HOW WOULD I DO

  45. reagents

    Do these reagents fit with the substance being testd for? First is Biuret reagent protein Second is BACL^2 starch Third is AgNO^3 chloride ion Final is albustix protein. I can help with two of these. BaCl2 is used to test for sulfates, not starch. AgNO3 is

  46. chem

    Kw = KaKb. With this equation you can convert any Ka to Kb and the reverse. Codeine (Cod), a powerful and addictive painkiller, is a weak base. a) Write a reaction to show its basic nature in water. Represent the codeine molecule with Cod. b) The Ka for

  47. physics

    I need help with this question. Would you be able to explain it please? Double slit interference patterns exhibit mλ path difference for constructive interference. Single slit diffraction patterns exhibit (m+1/2)λ path difference for constructive

  48. Physics- check answer please

    light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the

  49. physics

    light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above Would the

  50. physics

    light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above

  51. physics

    light travelling in air is incident on a soap bubble. If the path difference through the soap bubble is 2.5λ: a) constructive interference will occur b) destructive interference will occur c) partial interference will occur d) none of the above

  52. physics

    A student investigates the interference of light in a Young’s double slit experiment. i). Explain why there is no interference pattern if the two slits are 5.0 cm apart. ii). Explain why it is better for the student to observe the interference patterns

  53. English

    Can you please check these few sentencens, please? I went to John yestarday. OR I went to John's house yesterday. Leave the school and cross the street. OR Go out of the school and cross the street? I'd like cod (not a cod) with carrots. The bus trip lasts

  54. AP Physics B

    I'm unsure how to even start this problem or how I'm suppose to find out the distance at which destructive interference would occur... Two loudspeakers are 1.8 m apart. A person stands 3.0 m from one speaker and 3.5 m from the other. (a) What is the lowest

  55. physics

    Laser light is commonly used to demonstrate double-slit interference. Explain why laser light is preferable to light from other sources for observing interference. Doesn't double slit interference work best on monochromatic light? yea

  56. Chemistry

    An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537 cm-1. (a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer (refractive index of 1.34)? (b) What

  57. Chemistry

    When you placed transition metals on a scale to find their mass, why are the values negative or positive. For example these compounds Cobalt (II) chloride Copper (II) chloride Iron (II) chloride Manganese (II) chloride Nickel (II) chloride Zinc chloride

  58. maths

    What is mode n average for 2 students test scores our of 25 for maths. A Test 1: =21 Test 2: =24 Test 3:=19 Test 4: =21 K Test 1:= 18 Test 2:= 19 Test 3:= 19 Test 4:= 17 Test 2:= 19 Test 3:= 19 Test 4:= 17. N Test 1:= 16 Test 2:= 15 Test 3:=19..

  59. chemistry

    cobalt chloride forms pink crystals. when they are heated water is evolved an they turn blue. can you please explain how you could ue cobalt chloride as a test of water.

  60. Physics - Please Help!

    I really need help on these questions because I have a test tomorrow and don't understand how to do them. 1) A wire of diameter 0.6mm is placed in the path of light coming from a laser. Light diffracts around both sides of the wire; the diffracted waves

  61. geometry

    ok, so i don't understand this question. : which postulate justifies the following statement? "exactly one plane contains

  62. Chemistry

    Which of the following are true about the use of aluminum chloride in the Friedel-Crafts acylation reaction? Note that there may be more than one correct answer. Aluminum chloride removes chloride from acetyl chloride to generate a nucleophile that can

  63. biology

    You want to design an experiment to test if a bacteria affects a transmembrane protein. What types of controls should you use to eliminate effects of confounding variables?

  64. Medical coding and Billing

    Paternalism is best defined by which of the following? A. Interference with a person’s independence in order to benefit that person B. Interference with a person’s independence in order to reduce health care costs C. Interference with a person’s

  65. chem

    A 0.774 g mixture containing only sodium chloride and potassium chloride was dissolved in water. It required 29.6 mL of 0.416 M AgNO3 to completely precipitate all of the chloride present. What is percent composition by mass of sodium chloride and

  66. Chemistry

    How would I calculate these? I have the answers because there from a previous test. 1) How much heat is required to raise the temperature of a 5.52-g sample of iron ( specific heat = 0.450 J/g C) from 25.0 degrees C to 79.8 degrees C? 2) You mix 60. mL of

  67. Physics

    Why do ocean waves break as they approach the shore? Is it because of the principle of superposition. Would it be described as constructive or destructive interference? I believe it's constructive interference as the two waves combine the amplitude is

  68. Physics

    I'm having a difficult time understanding the formulas for maximum constructive interference and perfect destructive interference. I know that MCI there's the biggest amplitude? and for PDI it's 0. The forumlas are delta phi = 2pi(deltax/lambda)+delta phi

  69. Science

    Could I get some help please and thank you?! How could a city reduce its air pollution? A improve its public transportation system B eliminate the dumping of all solid waste C eliminate runoff from chemicals used at the airport D require all cars use

  70. Physics

    A double-slit interference experiment is performed with light from a laser. The separation between the slits is 0.58 mm, and the first-order maximum of the interference pattern is at an angle of 0.060 ◦ from the center of the pattern. What is the

  71. Chemistry

    How to separate the substances of sodium chloride, ammonium chloride, lead chloride and iron fillings from a mixture.

  72. Physics

    Determination of the boiling point of 0.01m solution of aluminum chloride and barium chloride and sodium chloride?

  73. physics

    Speakers A and B are vibrating in phase. They are directly facing each other, are 7.4 m apart, and are each playing a 72.0 Hz tone. The speed of sound is 343 m/s. On the line between the speakers there are three points where constructive interference

  74. Chemistry

    Determine the boiling points of 1 m solution of suger, glucose, urea, sodium chloride, barium chloride, aluminium chloride.

  75. Science

    A metal M forms 2 different chloride. if 12.7g of chloride A and 16.5g of chloride B show that the figures agree with the law of multiple proportion and write their formular

  76. Math

    I need some advice with this problem. Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. A. -(n+4), to eliminate the parentheses. B. 6(-s), to eliminate the parentheses. C.

  77. Chemistry

    A Metal X forms two different chloride. If 12.7g of chloride A and 16.3g of chloride B contains 7.1g and 10.7g of chlorine respectively, show that the figure agree with the law of multiple proportion. Write their formulae

  78. Chem AS

    When either chlorine or hydrogen chloride is passed over a heated metal M, the same chloride is produced. An aqueous solution of this chloride is acidic. Which one of the following could be M? A: Al B: Ba C: Cu D: Fe E: Na Ans: A Help w explanation please!

  79. Chemistry [Science]

    Oh gosh... I need help, with like everything... [Show all work] Aluminum nitrite & ammonium chloride react to form aluminum chloride, nitrogen gas and water. What amount of aluminum chloride is present after 43g of ammonium chloride have reacted

  80. CHEMISTRY

    chlorine is precipitated as silver chloride by reaction of silver nitrate with sodium chloride in an acid solution .how much sodium chloride in grams is required to produce 0.25g of silver chloride a)0.102g b)0.613 c)1.019 d)1.631g

  81. physics

    1)A wave created when two different waves meet will have an amplitude greater than the individual waves because of. A)destructive interference B)constructive interference C)antinodes D)a change in boundary I got B 2)If a wave has a period of .02 seconds

  82. Reposting chemistry help!!!

    A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the working.....

  83. Science (Chemistry)

    Iron forms two chlorides.One gram of the first chloride produces 2.26g of silver chloride and one gram of the second chloride produces 2.65g of silver chloride.Prove that these data illustrate the law of multiple proportions Please provide detailed answer

  84. Physics

    Does anybody know the answer to this question? According to the equation for the diffraction pattern, the angles of constructive interference (and thus the angles of destructive interference), would be... larger or smaller. My answer is smaller but I need

  85. chemistry

    A student added some bromine (reddish orange) in some carbon tertra chloride ro a sample of butane in a test tube and placed it in a dark cupboard. When the student removed the test tube it still had the reddish orange colour. When the test tube was left

  86. Physics - Hydrogen discharge tube

    a) Describe the emission spectrum of a hydrogen discharge tube b) Explain why different color lines appeared in different position in the spectrum. Use a suitable atomic model to help construct your answer. c) Explain how do you decide if the lines

  87. Chemistry

    A method to determine the chloride ion content of water involves precipitate the chloride ion as silver chloride using silver nitrate. Assuming that all the chloride ions in solution can be precipitated using silver nitrate, explain how this process might

  88. Physics

    Observing electron interference through an ordinary macroscopic two-slit experiment would be extremely difficult and would require very slowly moving electrons. (Slow for an electron means < 10^3 m/s.) How slowly would electrons have to move through slits

  89. Science

    So in science we are doing cold packs, So we have to use water and the following.... Please help me choose one(have to get from 0 degrees to 5 degrees no higher no less or you will fail) 1. Urea 2. Potassium Chloride 3. Ammonium Chloride 4. Sodium Chloride

  90. chemistry

    a solution of an unknown metal chloride (0.8870 g) was treated with silver nitrate to yield (1.9132 g). calculate the percentage by mass of chloride in the unknown chloride

  91. chemistry

    a solution of an unknown metal chloride (0.8870 g) was treated with silver nitrate to yield (1.9132 g). calculate the percentage by mass of chloride in the unknown chloride

  92. PHySICS

    2a) Explain polarization in your own words and list three applications. 2b) Explain why a film of thickness ë/4 produces constructive interference and a film of thickness ë/2 produces destructive interference.

  93. Chemistry chlorine plz help

    A metal x forms two different chloride.if 12.g of chloride A and 16.3g of chloride B contain 7.1g and 10.7g of chlorine respectively,show that the figure agree with the laws of multiple proportions.write there formulea plz i need the work....no hint plz

  94. AP physics help

    Two identical waves undergo pure constructive interference. How is the resultant intensity related to that of the individual waves? A. resultant intensity is half of wave intensity B. resultant intensity is same as individual wave intensity C. resultant

  95. chemistry hw question

    Magnesium hydroxide + hydrogen chloride-----> magnesium chloride + water How many grams of magnesium chloride can be produced from 14.60 mL of a 0.546M hydrogen chloride solution?

  96. Chemistry

    10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

  97. Chemistry

    10.0g of sodium chloride is dissoved in 300ml of 0.75mol/L magnesium chloride solution. Find the new concentration of chloride ions f the solution.

  98. Chemistry

    What Will be the effect of these salts using either blue or red litmus paper on hydrolysis? Copper chloride (CUCl2) Copper sulphate (CUSO4) Barium chloride (Bacl2) Ammonium chloride (NH4Cl)

  99. Chemistry

    What will be the effect of these salts using either blue or red litmus paper on hydrolysis? (1) copper chloride (CUCl2) (2) copper sulphate (CUSO4) (3) Barium chloride (BaCl2) (4) Ammonium chloride (NH4Cl)

  100. tax income

    To be a qualifying child, the taxpayer must meet three general tests and five specific tests. What are the three general tests? A. Relationship test, residency test and gross income test B. Support test, age test and relationship test C. Dependent taxpayer

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