1. Chemistry

    An unknown amount of water is mixed with 310 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 58.2 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. Answer in units of M

    asked by ag on March 19, 2012
  2. chemistry

    10.0 mL of a Cu2+ solution of unknown concentration was placed in a 250 mL Erlenmeyer flask. An excess of KI solution was added. Indicator was added and the solution was diluted with H2O to a total volume of 75 mL. The solution was titrated with 0.20 M

    asked by Samantha on November 19, 2014
  3. Math

    I am stumped and confused can someone help? The following data set gives the difference between the winning and losing scores in 50 randomly observed high school basketball games: 2, 12, 1, 2, 12, 5, 14, 2, 45, 9, 1, 8, 18, 28, 9, 4, 30, 16, 4, 12, 8, 13,

    asked by B.B. on July 31, 2009
  4. Math

    the directions for lemonade say to put 2 cups of liquid concentrate into one gallon of water. if olivia only wants to make one pint of lemonade, how many fluid ounces of concentrate should she put?

    asked by Jess on March 23, 2014
  5. English - Native speakers

    Helo :) Can you tell me if the following explanation of mine concerning possessive s is correct? We put 's with every noun in singular (my mother's house)and when we have irregular plurals (this is my children's school) We put just the apostrophe when we

    asked by Mark on April 6, 2011
  6. APA writing

    I a working on a APA document that has to be correctly formated. My question to you is, when I am citing, "where do I", or "do I" put the chapter number in the cite ? ..example, this was taken from chapter 7.... varicocele: enlarged veins of the spermatic

    asked by terry on May 18, 2010
  7. citing on a research paper

    Hi, I am a bit confused on how and when to cite sources on my research paper. For example, I have a small paragraph where I got the statistics from a website but I put it into my own words. So do I put a ( ) after each sentence or after the whole

    asked by bkue on May 21, 2012
  8. chemistry

    Consider 18.0 M H2SO4, if you need to make 250.0 mL of a 3.0 M solution of H2SO4, how would you do this? 18.0 M H2SO4 has a density of 1.84g/mL what is the molality of solution? Mass % of H2SO4 in the solution and the mol fraction of H2SO4 and water in the

    asked by Marie on April 29, 2013
  9. Chemistry

    Consider 18.0 M H2SO4, if you need to make 250.0 mL of a 3.0 M solution of H2SO4, how would you do this? 18.0 M H2SO4 has a density of 1.84g/mL what is the molality of solution? Mass % of H2SO4 in the solution and the mol fraction of H2SO4 and water in the

    asked by Marie on April 30, 2013
  10. Math

    Sam measured the out side of his vegetable garden.The sides measured 6 feet, 3feet, 6feet, and 3 feet.How much fencing does sam need to put a fence around the whole garden?Show two different methods of finding the solution.

    asked by Rashida on July 25, 2012
  11. To "WOK..."

    Please put your School Subject in the School Subject box (Examples: math, science, algebra, geography). When all you put is one letter, most tutors are not inclined to open your post since you are not following instructions.

    asked by Writeacher on March 2, 2015
  12. Math

    My english teacher gave us 8 possible essay questions that might show up on are exam. She said she will put three of those essays on the test for us to do. She said that we could figure out the ones that she was going to put on there. If there is 8

    asked by Unknown on October 27, 2009
  13. English

    Hello. Please help me with the phrases: 1) is it possible to use "proclaim" in the context: "the president proclaimed that he was ready to sign an agreement"? 2) is it possible to use "put into practice" with sanctions (the UN put sanctions into practice

    asked by Ilma on May 13, 2011
  14. algebra

    a chemist mixes an 11% alchohol solution with an 8% alchohol solutoins. How many milliliters of each solution should he use to make a 600ml solution that is 8% alchohol solution? Why wouldn't we just use 600ml of the 8% solution to begin with? So 0ml of

    asked by nicole on September 12, 2006
  15. chemistry

    a chemist has a supply of cuso4 solution that contains 230 gram per litre of water. she wishes to make a copper sulphate solution that has a solution of 200.0 grams per litre gow ,uch of her copper sulphate solution should she use and how much water should

    asked by Cassie on May 18, 2014
  16. general chemistry II

    a solution of a metal ion has a molar absorptivity (E) of 75M^-1 at 450 nm. a 10mL sample of this solution was withdrawn and diluted to 250mL. from this diluted solution, a 5 mL sample was withdrawn and diluted to 100 mL. the absorbance of the final

    asked by libby on June 6, 2018
  17. college algebra--need help please!!

    solve the following exponential equation. use exact answers only. not sure how to put it into the equation but it is 2 then 1-9x where the 1-9x is above the 2=e2x where the 2x is above the 2. Can someone tell me or explain to me how to put this equation

    asked by Heather on November 24, 2012
  18. Normality headache

    I do not fully grasp the idea of Normality. What are the normality and the molarity of a sulfuric acid solution if 30mL of it are required to completely neutralize 24mL of 0.02N NaOH? (one of them, N or M, is never equation dependent because...??) HCl(aq)

    asked by Kizner (chem) on June 16, 2006
  19. Flash back in language

    Let me get this straight.............................. is the flashback in language ( Jeremiah's story this) Before she went off to college she used to put cocoa butter on her arms and face and it would smell real nice. When she come back from college she

    asked by Mary Jones on October 23, 2018
  20. physics

    An athlete thtrew a short put of mass7.52kg through a distance of 24m when we projected a short put at angle of 30. Assuming there is no air resistance, what is the initial kinetic energy of the athlete.

    asked by John on April 15, 2012
  21. health, safety, and nutrittion

    the children in your class are working on an art project thar requires them to use a standard hair dryer to produce a particular effect. of the following locations, which one would be the safest place to put the hair dryer while the children are working on

    asked by Alana on November 9, 2011
  22. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go

    asked by Sam on October 22, 2012
  23. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go

    asked by Sam on October 22, 2012
  24. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go

    asked by Sam on October 22, 2012
  25. Chemistry

    Can someone check to see if my answers look ok. For the following crystals, explain how their melting points are related to the bonding forces and the crystal structure: a)Copper,Cu Copper has metallic bonds between atoms. It can occur as isometric cubic

    asked by Nancy on January 21, 2008
  26. chemistry 1st year, for midterm help

    Hi, Can any1 help with theses questions. I need to solve these because there will be similar questions on the midterm for me, coming week. Btw I have tried few. 1. How many milliliters of a 15.0%, by mass solution of KOH (Aq) ( d= 1.14g/mL ) are required

    asked by ur class fella on February 11, 2009
  27. Chemistry

    a potassium dichromate is prepared by 0.3525grams of K2Cr2O7 is enough water to yield 250.0mL of solution. a student then measures 10.00mL of an unknown solution of Fe2+ into an erlenmeyer flask and dilutes with 90mL of 1.0M hydrochloric acid. she then

    asked by Anonymous on April 1, 2014
  28. algebra 2

    How much of an 18% solution of sulfuric acid should be added to 360 ml of a 10% solution to obtain a 15% solution?

    asked by Derron on June 22, 2010
  29. Chemistry

    Pure water is added to 25.0 mL of a 1.00 M HCL solution. The new solution has a volume of 2.00 L. What is the pH of the new solution.

    asked by Derrick on May 1, 2012
  30. chemistry

    require 400 mL of a 0.4 M NaOH solution and you have a 1.2 M stock solution. How would you make up the solution?

    asked by roshan on September 13, 2011
  31. chemistry

    You have a 10 M acidic solution. However, you need that solution to be 0.25 M. How many ml of 10 M should be diluted to obtain 300 ml of 0.25 M acid solution?

    asked by markees on January 3, 2011
  32. Chemistry

    0.75 L of a 48.5 %V/V methanol solution is diluted to make 5.60 L of solution. What is the final concentration of this solution?

    asked by JavaCompiler on May 7, 2016
  33. chemistry

    How many grams of are present in a solution if 38.60 of 0.145 solution is needed to titrate the solution?

    asked by LaKeisha on October 2, 2012
  34. Algebra 1 Honors

    2x+4=5(x+1) -2(x+2) Would this be identity (all numbers are the solution), No solution (no real number solution), or can it be solved?

    asked by Stefanie on October 9, 2011
  35. Math

    What amount of a 60% acid solution must be mixed with a 30% solution to produce 300 mL of a 45% solution?

    asked by Anonymous on September 15, 2016
  36. Chemistry

    To what volume must a solution of 86.1 g H2SO4 in 494.0 mL of solution be diluted to give a 0.18 M solution?

    asked by Sam on May 11, 2011
  37. college

    what quantity x of a 65% acid solution must be mixed with a 20% solution to produce 300 mL of a 45% solution

    asked by Claire on September 2, 2010
  38. math

    Identify the solution of the system of equations if any -2x-4y=1 , 12y=-6x-3 is this no solution or (o,-1) (-1,0) or infinitelt many solution

    asked by ann on October 28, 2014
  39. Chemistry

    20.0 mL of a 0.18 M HCl solution are combined with 50.0 mL of a 0.085 M NaOH solution. What is the pH of the resulting solution?

    asked by Molly on April 27, 2015
  40. Math (Calc) (Differential Equation Solution)

    Some of the curves corresponding to different values of C in the general solution of the differential equation are shown in the graph. Find the particular solution that passes through the point (0, 2). y(x^2+y) = C 2xy + (x^2+2y)y' = 0 How would I start

    asked by Ray on May 30, 2017
  41. Chemistry

    Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq). I know the most acidic solution has the lowest pH and the most basic solution has the highest pH. But how am i supposed to know the pH if i don't

    asked by Nia on October 17, 2011
  42. urgent chem help ( dr bob plz)

    A particular household ammonia solution (d= 0.97g/mL) is 6.8% NH3 by mass. How many milliliters of this solution should be diluted with water to produce 650 mL of a solution with pH = 11.55? ------------------------- i am gettig 5.3 x 10^-10 is that rite

    asked by javeya on February 17, 2009
  43. More Civics

    What happens to an amendment that is not ratified? A) it goes back to the senate for a vote B) it is not put in the constitution, but remains a law C) it is sent to the president D) it is not put in the constitution and it is not a law pls help :3

    asked by Moo on November 12, 2015
  44. Biology ?

    Use an example to describe the relationship among cells, tissues, organs, and organ systems Do you mean analogy rather than example? If so: Picture a living organism as a city. The houses are cells, city blocks are tissues, residential areas could be

    asked by marco on December 2, 2006
  45. Biology

    Use an example to describe the relationship among cells, tissues, organs, and organ systems. Do you mean analogy rather than example? If so: Picture a living organism as a city. The houses are cells, city blocks are tissues, residential areas could be

    asked by marco on December 2, 2006
  46. analytical chemisty

    Consider the standardization of a solution of K2Cr2O7 with iron metal according to the following: Reaction: Fe + Cr2O7-2 → Fe +3 + Cr+3a. How many grams of K2Cr2O7 are required to prepare 500 ml of a 0.13 N solution? What is the exact normality of the

    asked by Anonymous on February 2, 2013
  47. Chemistry

    1.06g of Na2CO3 is dissolved in water to make 250cm^3 solution. 10.0 cm^3 of this solution was further diluted to make 500cm^3 of 2nd solution. 25.0cm^3 of 2nd solution reacted with 28.5cm^3 of HCl. Find the concentration of HCl in mol/dm^3

    asked by Gary on July 14, 2016
  48. Chemistry 2

    You have a stock solution of 15.0 M NH3 . How many milliliters of this solution should you dilute to make 1200ml of 0.280 M NH3? If you take a 15.0ml- portion of the stock solution and dilute it to a total volume of 0.600 L , what will be the concentration

    asked by Melissa on December 3, 2009
  49. Chemistry

    You have a stock solution of 14.4 M NH3. how many mililiters of this solution should you dilute to make 1050mL of .220 M NH3 answer 16.o mL Question if you take a 10.5mL portion of the stock solution and dilute it to a total volume of .600L, what will be

    asked by Natalie on February 21, 2011
  50. Chemistry

    A solution of 0.211 M NaOH is used to titrate 24.0 mL of a H2SO4 solution. If 19.0 mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)→2H2O(l)+NaSO4(aq)

    asked by Ava on July 22, 2016
  51. Chemistry

    determine the approximate molarity of a solution of NaOH prepared by diluting 10ml of 6M NaOH to a volume of 400 ml. using the solution in the first part, 24.5ml of NaOH solution was required to neutralize 26.4ml of a .150M HCl solution. find the molarity

    asked by Chuck on February 28, 2008
  52. CHEMISTRY

    Ion Concentrations 1.) A solution is prepared by dissolving 5.00 g of stannic nitrate in enough water to make 250.0 mL of stock solution. A 15.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the

    asked by Anonymous on October 25, 2013
  53. Math, Can someone check my answers?

    Can someone please check my answers? Tell whether the given equation has the ordered pair as a solution. 11. y = 6x;(3,16) 13. y = -4x; (-2,8) 15. y = x - 3/4; (2,1 1/4) Answers: 11. Not a solution 13. Has a solution 15. Has a solution

    asked by Phoebe on October 31, 2014
  54. College Algebra

    A mixture of 20% disinfectant solution is to be made from 13% and 23% disinfectant solution. How much of each solution should be used if 40 gallons of the 20% solution are needed?

    asked by Anonymous on September 21, 2017
  55. Algebra

    what is two ways to simplify the two problems? problem 1: (-4m^2 n^2)^3 * (2m^3 n)^-1 solution 1: -(32n^5/m^9) Solution 2: ? problem 2: (x^-(1/2) y^3)^-2/ xy^(1/3) * x^2 y^-4 solution 1: 1/x^2y^(7/2) solution 2: ?

    asked by anonymous on August 30, 2018
  56. science

    I have several questions regarding essential oils. Please answer as many questions as you can that is within your expertise. For each of the following naturally occurring oils: Citronella ,eucalyptus,cinnamon leaf,nutmeg,clove,rose,jasmine,lavender a.how

    asked by khairul on May 6, 2007
  57. biology

    1. Owls sleep during the day and are awake at night because of their kind of estivation habituation* circadian rhythm conditioning 2. When a bird sings to signal others of the same species to keep away, it is showing signs of cheerfulness courtship

    asked by Jesicca on April 8, 2011
  58. Biology

    A person with AB blood type is transfused with type O blood. What happens and why? ---- The textbook says there will be no immune reaction. I understand that the transfused type O red blood cells have no antigens and the recipient type AB plasma has no

    asked by Jessie on December 14, 2012
  59. Chemistry 130

    Can someone please help me and let me know if these questions and answers are correct? I just need a second opinion…and if there not correct can you help me…please?!? 1.(3). In the Arrhenius definition, an acid is a substance that a. turns litmus paper

    asked by Jess on October 6, 2009
  60. chemistry

    A solution is prepared by placing 23.9 g of KCl in a 0.500 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 27.9 mL of the KCl solution react exactly with 45.0 mL of

    asked by john on October 1, 2014
  61. Chemistry

    A solution is prepared by placing 27.8 g of KCl in a 0.700 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 22.1 mL of the KCl solution react exactly with 43.0 mL of

    asked by Ali on March 2, 2014
  62. chemistry

    You want to measure the oxalic acid contents in 20 ml of a solution. To this end, you add 100 mmol sodium dichromate to the solution. Then you titrate the remainder of the dichromate with a Fe2+ solution of 1 mM, of which you need 11 ml. What was the

    asked by Anonymous on November 26, 2010
  63. Science

    A potassium permanganate solution containing 1.58g of KMnO4 per liter is added into 5 mL of an acidified iron (||) sulfate solution . Decolorizing of KMnO4 solution has been added . Calculate the mass of FeSO4 . 7H2O which has been dissolved in one liter

    asked by Hasan on February 11, 2019
  64. chemistry help plz

    A potassium permanganate solution containing 1.58g of KMnO4 per liter is added into 5 ml of an acidified iron (||) sulfate solution. Decolorizing of KMnO4 solution has been added .Calculate the mass of FeSo4.7H2O which has been dissolved in one liter of

    asked by cynthia on January 17, 2016
  65. Chemistry

    1. What is the molar of a sodium bicarbonate solution prepared from 150 g of NaHCO3 in 150 mL solution? 2. What mass of glucose (C6H12O6) is needed to prepare a solution of 10 M, 5 L solution? 3. What volume in liters of a 4.0 M Ca(NO3)2 is needed to

    asked by Anonymous on May 4, 2015
  66. Differential Equations

    For the following initial value problem: dy/dt=1/((y+1)(t-2)), y(0)=0 a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why

    asked by Erica on January 31, 2013
  67. Speech

    I have to give a problem-solution speech on "Global Warming" what would i put into this? I need to point out some good solutions to the problem. It has to be a really interesting speech for the audience any pointers would be good. I also need a power point

    asked by Rina on February 21, 2009
  68. CHEM

    If NO3- has 3 resonance structures, but only one has to be written, where does the extra electron, making there then be 24 electrons, go if you cannot put brackets around the structure you are drawing? Do you put -1 on both of the singly bonded

    asked by K on November 26, 2007
  69. computer

    name the four major types of components that makeup a computer. C__ P__ UNIT (CPU) R___ or M __ memory (RAM) Auxiliary S____ ____ put Units ____ put Units

    asked by pam on November 3, 2010
  70. Grammar

    Instructions: Add commas where needed in the following sentences. Some sentences may not require commas. (Rule 2a) Work: 1. Students parents teachers and visitors attended the school play. -So i put the commas between students and parents, and i put it

    asked by Losa on June 25, 2012
  71. Science

    How has the study of cells affected science today?

    asked by Pamela on January 23, 2007
  72. science

    do plant cells have chloroplasts or mitochondria? Please help...im so confused!

    asked by baby girl on April 13, 2009
  73. bio

    during what process does the cell divide into two daughter cells?

    asked by kristyn on May 14, 2008
  74. science

    how do cells use food using big idea of energy

    asked by bob on October 16, 2011
  75. 5th grade Science

    Why does a multicellular organism need specialized cells and why their apperances are different?

    asked by Mark on June 6, 2009
  76. Science

    Imagine you are a plant. How are you and your cells different than animals. 1/2 - 3/4 page

    asked by Bob on August 23, 2012
  77. science

    Briefly explain why it is important to know how cells function

    asked by Jiang on January 18, 2012
  78. chemistry

    how do you draw a calomel electrode. Does it require two or one cells?

    asked by Sam on June 3, 2008
  79. biology

    Give examples of animal and plant cells.

    asked by kim on October 30, 2009
  80. Biology

    If all of our cells have the same DNA, how come all 23 of our chromosomes are shaped differently?

    asked by Jamitre on December 10, 2014
  81. biology

    Pls how can i itemize the blood cells in litres

    asked by diana on March 2, 2015
  82. CELL BIOLOGY

    As cells in an organism become more specilized, what ability do they lose?

    asked by Ishmael on May 18, 2008
  83. Human Anatomy

    ___________ are multinucleated cells that destroy bone?

    asked by Will on September 20, 2009
  84. Lien

    Why is polymerization such a useful process for cells to make macromolecules?

    asked by biology on August 21, 2008
  85. science

    how do you determine which direction cells will move toward membrane?

    asked by hazeleyedgirl on October 30, 2007
  86. Easy Biology

    why cells within the same organism have the same ADN, but look and function differently?

    asked by Biology on October 16, 2010
  87. science

    with the exception of some green algae, all plants are that contain many cells

    asked by Anonymous on January 8, 2018
  88. science

    information on sicled cells disease how they work,how do you get it etc

    asked by Anonymous on March 2, 2013
  89. Science

    What is a four-cell battery with the cells connected in series with each other? How would it look like?

    asked by Thi on March 16, 2015
  90. 7th grade science

    how does the dna of prokaryotic and eukaryotic cells differ?

    asked by jace on October 18, 2012
  91. physics

    when it is desired to connect cells in series? in parallel?

    asked by rhia on May 16, 2011
  92. biology

    hey does prokaryotes cells have cell walls

    asked by angelica on December 12, 2009
  93. biology

    What would happen to your cells if they made a poisonous chemical?

    asked by Cyn on January 4, 2010
  94. biology

    what is the hollow ball of cells formed during cleavage?

    asked by jack on October 11, 2007
  95. Biology

    The most abundant molecule found in all types of cells is?

    asked by Jenna on October 6, 2007
  96. chem

    the gap between two brain cells is 0.0020 nm. how many meters is this

    asked by jen on January 15, 2011
  97. science

    how do cells use food using big idea of energy

    asked by bob on October 16, 2011
  98. bio

    do skeletal muscle cells have cilia or flagellum

    asked by julie on February 12, 2008
  99. science

    ocompare and contrast an house with the parts of cells

    asked by elizabeth on February 28, 2008
  100. 7th grade science

    a group of similar cells that work together to do one job

    asked by bobby on September 9, 2008