1. Chemistry

    List the following compounds in order of increasing electrical conductivity: 0.1 M formic acid (HCOOH), 0.1 M (NH4)3PO4, 0.1 KCl, and 0.1 M glucose solution (C6H12O6). Why are they in that order?

    asked by Sam on November 6, 2013
  2. CHEM please HELP

    The boiling point elevation of a solution consisting of 2.12 g of a nonvolatile solute in 97.4 g of benzene is 0.6602 oC. What is the molecular weight of the unknown solute? i have no idea how to solve this question

    asked by jerry on February 13, 2009
  3. Chemistry

    The freezing point of a 0.10m solution of mercury(I) nitrate is approximately -0.27 degrees celsius. Show that these data suggest that the formula of the mercury(I) ion is Hg2 2+

    asked by Amy on March 6, 2011
  4. child development

    If a child is unable to connect to others because her parents do not show her love and acceptance what would be the appropriate solution for this situation? A. Change adult expectations. B. Help the child get her needs met. C. Get outside help. D. Use

    asked by bev on August 25, 2015
  5. chemistry

    Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

    asked by sarah on November 4, 2012
  6. chemistry

    Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

    asked by sarah on November 4, 2012
  7. Calculus

    let d2y/dx2= 6x. Find a solution to the differential equation that is continuous for negative infinity to positive infinity and whose graph passes through the point (0,1) and has a horizontal tangent there.

    asked by Anastasia on February 26, 2011
  8. chemistry

    A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

    asked by ram on February 24, 2017
  9. Chemistry

    Find the pH and pOH of a solution that is 1.04x10^-4 M HCl. Do i have to use an ice table to solve this? or is there a short cut? please help No. HCl is a strong acid (100% ionized), so the H^+ concentration is 1.04 x 10^-4 M.

    asked by T on July 4, 2007
  10. Chemistry

    When a pair of copper wires are connected to the (+) and (–) terminals of a 9–V battery and immersed in a solution containing I- ions, one of the wires becomes coated with I2. Besides simply wiping off the wire, how else could you remove the I2

    asked by Anonymous on October 23, 2013
  11. Chemistry

    A 30.00ml sample of 0.1234 M hypobromous acid (HBrO) is titrated with a 0.2555 M KOH solution. The Ka for HBrO is 2.5*10^-9 Calculate the pH of the titration mixture at the equivalence point.

    asked by Anonymous on April 17, 2010
  12. Math

    Hi. So we had a long test with this question.. I was wondering how to solve it? Coz our teacher didn't discuss the answers.. and most probably we'll have the same type of question during midterms.. Find the Solution Set 9/|2-5x| - 4/y^2-3y = 5 2/|2-5x| +

    asked by Jen on August 17, 2011
  13. Math clarification Reiny

    This is the problem you helped me with. I was curious, do I write the solution set as (1 + i3ã3)/2, (1-i3ã3)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } ã(1 - 4(1)(7))/2 = (1 } ã-27)/2 Your answer is an

    asked by Sabrina on September 25, 2010
  14. Chemistry

    A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.

    asked by BEE on August 1, 2011
  15. Chemistry

    A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.

    asked by BEE on July 31, 2011
  16. Chemistry

    A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant of Co(NH3)62 is 5.0× 10^31.

    asked by HELP. PLEASE!! on May 9, 2012
  17. Chemistry

    A 1.516 M solution is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.

    asked by Anonymous on November 4, 2014
  18. Chemistry

    What is the concentration of chloride ions (in) in a solution prepared by adding 0.075 moles of calcium chloride to 425 mL water,assuming no volume change up on mixing? Thanks!

    asked by Wendy on April 23, 2012
  19. physics

    a tennis ball is served horizontally from 2.4 above the ground at 30 m/s the net is 12 m away and 0.9m high will be clear the net? a. 0.64m b. 1.62m c.2.72m d.none ans is option B .... but how? wanna solution..

    asked by MCAT student on May 7, 2018
  20. Chemistry

    What's is the concentration of silver ions in a saturated solution of silver carbonate? The k^sp of Ag2CO3 is 8.1x10^ -12. Is the answer 5.88x10^-8? I have a test tomorrow and I really need to make sure I'm doing these problems right, but I feel like I am

    asked by Catherine on May 9, 2013
  21. biology

    Most automobiles have water-cooled engines. What must be true about a solution that can replace water in the cooling system, such as antifreeze? I know this is the second time I'm posting this question, but it's been hours and still no one's responding.

    asked by lamiya on September 12, 2009
  22. AP Chemistry

    When 0.055 moles of lead(II) nitrate are dissolved in enough water to make 803 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

    asked by Lacey on September 19, 2012
  23. math

    A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

    asked by Anonymous on July 29, 2017
  24. Chemistry

    Does anyone know how to do this problem, i can't seem to solve it. If 39.25 g of a substance is dissolved in 155.5 g of benzene solvent, the freezing point of the solution is 0.08 oC. Calculate the apparent molar mass (g/mol) of substance.

    asked by SuSu on February 2, 2010
  25. pre calc

    Find the values of b such that the system has one solution. x^2 + y^2 = 36 y= x+b and then they give me an answer box b=_________ (smaller value) b=_________ (larger value) i have absolutely no idea how to even begin this and what they are asking. could

    asked by gabs on June 7, 2011
  26. chemistry

    What is the molar concentration of 2000. mL of aqueous solution containing 125 g of glucose, C6 H12O6? Molar mass 180.15 g/mol. Report your answer to three significant figures.

    asked by Mely on September 5, 2010
  27. science-chem

    If I'm given 0.025 molar solution of Li2SO4(aq) and I have to find the concentration of each ion, how would I go about doing it? THANKS! My work (just li): 0.025M Li2SO4*(2MolLi/1MolLi2SO4)=.....Would that be right? I feel like there has to be one more

    asked by Ally on September 17, 2009
  28. pre cal

    Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

    asked by megan on September 17, 2010
  29. Chemistry

    A solution is prepared by adding 300 mL of 0.500 M NH3 and 100 mL of 0.500 M HCl. Assuming that the volumes are additive, what is the pH of the resulting mixture? Kb for ammonia is 1.8 x10 -5

    asked by Taylor on October 4, 2010
  30. Chemistry

    For the following acids: i. CH3COOH ii. HNO2 iii. HCN a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. c)Identify the acid-base pairs.

    asked by Andrea on May 13, 2012
  31. chem

    7.50gram quantity of a diprotic acid was dissolved in water and made up to exactly 250ml. If 25ml of this solution were neutralized by 11.1 mL of 1.0 M KOH then what is the molar mass of the acid? I did 7.50/5.55x10^-3

    asked by Jin on July 24, 2010
  32. Chemistry

    What is the concentration of arsenate ions in 3.5 M solution of arsenic acid? The acid-dissociation constants of H3AsO4 are: Ka1 = 5.0 x 10-3 Ka2 = 9.3 x 10-8 Ka3 = 3.0 x 10-12 I can't figure out how to set up the question

    asked by Kelly on March 18, 2015
  33. Solid Mensuration

    In a circle with a diameter of 10m, a regular five-pointed star touching its circumference is inscribed. What is the area of the part not covered by the star? Pls help with a solution and a diagram. Thanks!

    asked by Justine on April 18, 2016
  34. math

    A fruit seller buys 100 bananas for Rs 40. Twenty bananas are spoiled and thrown away. At what rate should he sell the remaining so as to gain 10% ? Pls give me the solution of it.

    asked by sam on November 18, 2015
  35. chemistry

    a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.

    asked by alice on May 13, 2013
  36. Physics

    If the average gauge pressure in the artery is 1.41E+4 Pa, what must be the minimum height, h of the bag in order to infuse glucose into the artery? Assume that the specific gravity of the solution is 1.04.

    asked by Sam on April 20, 2016
  37. Pre-algebra

    Dwayne walks a total of 960 feet around 3 sides of a square city block. Which equation and solution show a correct way to find the perimeter, P, of the block?

    asked by Leigha on October 24, 2014
  38. Chemistry

    A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant of Co(NH3)62 is 5.0× 10^31.

    asked by HELP. PLEASE!! on May 9, 2012
  39. Chemistry

    When 0.016 moles of lead(II) nitrate are dissolved in enough water to make 748 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

    asked by Mike on October 11, 2010
  40. Math

    Hi! My teacher wanted me to sketch the graph of solution set of each system. For the first question, she wants me to use the slope intercept form and the second question using a table of values, but, I'm a little lost. Can someone help? Thanks! 1.) 3x + 2y

    asked by Heather on March 21, 2015
  41. chemistry

    What is the molar concentration of 2000. mL of aqueous solution containing 125 g of glucose, C6 H12O6? Molar mass 180.15 g/mol. Report your answer to three significant figures.

    asked by Mely on September 5, 2010
  42. Chemistry

    Like water, liquid ammonia undergoes autoionization: (a) Identify the Brønsted acids and Brønsted bases in this reaction. (b) What species correspond to H and OH and what is the condition for a neutral solution?

    asked by sok on March 10, 2011
  43. Math, Calculus

    help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx - 2x^(2) dy = 0 ;y = e, x

    asked by Huck on October 19, 2009
  44. chemistry

    Calculate the molarity (M) of Na+ in a solution prepared by adding 1.00 L of 0.800 M NaHC2O4 and 250 mL of 0.300 M NaHC2O4 . Assume volumes are additive. the answer is 0.700 but im not sure how to go about solving it please help thanks

    asked by BOB on September 29, 2011
  45. chemistry

    There is a ball with a mass of 1000 lbs. It's turned into wire with a diameter of 3.12 x 10^-1 How long is the wire? This is my crazy chemistry teacher's idea of a test...and I don't even think there's a solution. HELP ME

    asked by Molly on October 3, 2011
  46. chemistry

    a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.

    asked by lucy on May 13, 2013
  47. wildcat

    Compound Interest: Suppose $1,600 is invested in a savings account that pays 5% compounded semiannually, how much is in the account at the end of 11 2 years? having difficulties in finding a solution

    asked by Lynn on September 17, 2012
  48. Chemistry

    When 0.083 moles of lead(II) nitrate are dissolved in enough water to make 617 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of

    asked by Rara on October 2, 2011
  49. Chemistry

    A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

    asked by Biplob on October 20, 2016
  50. Chemistry

    What volume of 0.01 mol L-1 Li2CO3 solution would contain 0.035 mol lithium carbonate? Give your answer as 2 sig fig (this is technically not correct), followed by a space then the units.

    asked by Deepika Padukone on June 13, 2012
  51. Science // Chemistry

    How many grams of KOH are needed to make 1.00L of a 1.3 molar (1.3 M) solution? ------------------ I am not sure how to start this question, my teacher wants us to use conversion factors and write it out but I don't get how I am supposed to start it.

    asked by Anonymous on March 2, 2015
  52. chemistry

    If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?

    asked by Jade on November 2, 2014
  53. Chemistry

    Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)

    asked by Jake on October 22, 2014
  54. Math Reiny question

    This is the problem you helped me with. I was curious, do I write the solution set as (1 + i3ã3)/2, (1-i3ã3)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } ã(1 - 4(1)(7))/2 = (1 } ã-27)/2 Your answer is an

    asked by Sabrina on September 24, 2010
  55. Chemistry

    When 0.046 moles of lead(II) nitrate are dissolved in enough water to make 485 milliliters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

    asked by Cheyenne on September 23, 2010
  56. intermediate algebra

    in solving the equation (x+4)(x-4)=9 eric stated the solution would be x+4=9 =>5 or x-4=9 =>13 however at least one of these solutions fails to work when subsituted back into the original equation. why is that? solve the problem yourself and explain your

    asked by Anonymous on August 22, 2012
  57. Math

    Hi! My teacher wanted me to sketch the graph of solution set of each system. For the first question, she wants me to use the slope intercept form and the second question using a table of values, but, I'm a little lost. Can someone help? Thanks! 1.) 3x + 2y

    asked by Heather on March 21, 2015
  58. Chemistry

    Calculate the molar solubility of MgCO3 in a solution that already contains 1.7×10−3 M sodium carbonate. MgCO3 Ksp = 6.82 x 10-6 IMPORTANT NOTE: You must use the quadratic equation to solve this problem. (DrBob222- thank you so much for all your help!)

    asked by Chloe on April 26, 2013
  59. chemistry

    determination of the oxalate content in k2 cu(c2o4)2 .2h2o, during standardization of permanganate solution using sodium oxalate, can the titration between Mno4- and C2o42- at 25degree celcius be perform?

    asked by ABCx on June 26, 2012
  60. CHEMISTRY!!!!

    Determine the pH at the equivalence point in the titration of 41.0 mL 0.096 M formic acid with 0.108 M NaOH at 25oC. Calculate the pH of a solution that is 0.22 M pyridinium ion (C5H5NH+) at 25oC.

    asked by Michelle on March 5, 2015
  61. Chemistry

    How do I do this?? Calculate the pH at the equivalence point for the titration of 0.20 M aniline (C6H5NH2, Kb = 3.8 x 10-10) with 0.20 M HCl. [Hint: remember the dilution factor caused by addition of titrant to the aniline solution.]

    asked by Jamie on October 15, 2009
  62. Science

    15gm of substance is dissolved in 450ml of water the resulting solution was found to freeze at -0.34degree Celsius.Calculate the molar mass of the substance. Please help me out with this problem..

    asked by Gash on March 22, 2019
  63. English Expressions

    Think of the loci method. In this room you can find 9 fixed things and number the things systematically from top to bottom and from left to right. Then you can recall what you have memorized with ease. You need to use the 3 3 3 system. After that prepare 9

    asked by John on December 12, 2007
  64. Science Sorry I just need help one more time!

    Ok I am doing a project in science on radiation. I have to make a brochure. I need help answering these questions about radiation. Or some good sites would be nice too. I looked on google but they didn't really help. Thank you! Where does radiation come

    asked by Amy on January 15, 2009
  65. Physics

    A target lies flat on the ground 3m from the side of a building which is 10m tall. A student rolls a ball off the horicontal roof of the building in the direction of the target. Air resistance is negligible. Te horizonal speed with which the ball must

    asked by Tammy on March 25, 2007
  66. Finance

    Rob and laura wish to buy a new home. The price is $187,500 and they plan to put down 20%. CIBC will lend them at a fixed rate for 25 years with monthly payments. How much will Bob and Laura's monthly payment be? Assuming they pay off this mortgage over

    asked by Yvonne on September 30, 2015
  67. physics

    If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away. 1. I

    asked by sarah on April 16, 2012
  68. Algebra/Math

    How much dry substance is there if we have 150g of 8% of a solution of this substance.

    asked by GeniusTigeress on February 20, 2017
  69. maths steve reiny

    Sqrt(x)^sqrt(x)=2 show solution step that all i need thanks

    asked by Anonymous on November 2, 2016
  70. chemistry

    Calculate the [CH3CO2H] in a solution if it has a pH 3.21. CH3CO2H = CH3CO2- + H+

    asked by HELP ASAP PLEASE on October 10, 2013
  71. math

    if the domain is the set of integers, the solution set of x^2 -3x -4

    asked by Anonymous on December 26, 2010
  72. math

    1.0 Solve for x: (a) 2x ¨C 3(x + 2) ¡Ý 5x ¨C( x- 5) (b) Solve simultaneously x - 5¡Ü 2 and x ¨C 1 ¡Ý 3 2.0 Find solution to: (a) 5/(x-1) > 0 (b) (3x+3)/(3x-x2 ) < 0

    asked by lupupa on November 11, 2011
  73. Chemistry

    If the Ka of a monoprotic weak acid is 4.3*10^-6, what is the pH of a 0.16 M solution of this acid?

    asked by Josh on July 24, 2011
  74. Chemistry

    If Ka for HNO2,=4.5x10-4, find the [H+] a 0.9 M HNO2 solution.

    asked by Kathy on May 26, 2016
  75. chemistry

    A liter of 8 M NaOH solution contains how many grams of NaOH?

    asked by a on January 14, 2010
  76. chemistry.

    How many grams of H3PO4 are in 175 Ml of a 3.5 M solution of H3PO4?

    asked by Denmark on November 15, 2009
  77. chemistry

    How would you prepare a standard solution of 1m HCL(5.6 of HCL is 1.18)?

    asked by Joy on March 8, 2011
  78. pre calculus honors

    solve the system if possible | x+y+z = 15 | | < 7x+y+z = 75 | | | 3x+y-z=29 a. x=10,y=2,z=3 b. x=–10,y=–2,z=–3 c. x=3,y=10,z=–3 d. x=12,y=9,z=–3 e. no solution; inconsistent system

    asked by evelyn on August 24, 2016
  79. Chemistry

    When you have 250. mL of a 2.80 M solution of HCl, how many moles of HCl do you have

    asked by Kay on February 11, 2013
  80. chemistry

    how many g of agno3 would you need to make a 575ml solution of 0.25 m agno3

    asked by sherry on August 8, 2012
  81. math

    how i can see the exact solution of 6y-12y=12 and4x-12y=8

    asked by luis on November 11, 2012
  82. chemistry

    What mass of KBr is contained in 50.0 mL of a 5.10 M solution of KBr?

    asked by taylor on January 23, 2015
  83. algebra

    Write an inequality and provide a value that may or may not be a solution to the inequality.

    asked by mary on January 15, 2009
  84. Chemistry

    how many ml of 0.200m NAOH solution contain 2.00g NaOH(MW =40.00

    asked by Tapiwa on May 4, 2016
  85. Differential Equations

    Verify whether the given equation(y=c1-cos(x+c2)) is a solution to this equation[(d^2y/dx^2)^2 + (dy/dx)^2 - 1 = 0].

    asked by Alex on April 16, 2017
  86. math116

    how do you know when an equation has infinitely many solutions? How do you know when an equation has no solution?

    asked by barb on August 5, 2010
  87. algebra

    Can you give me and example of an inequality and provide a value that may or may not be a solution to the inequality?

    asked by C on April 5, 2008
  88. science(chemistry)

    2 mL 1.5 M naoh and 1.5 mL 2 M naoh mixed solution's concentrate=?

    asked by rajib on May 19, 2016
  89. math

    tell whether each equation has one solution, zero solutions or infinite solutions 5(x-3)+6=5x-9

    asked by bill on March 8, 2017
  90. Chemistry

    What is the [H3O] concentration in a 1.0M CH3COONa solution? (The Ka for CH3COONa is 2.0*10-5.)

    asked by Brianna on February 24, 2012
  91. math

    You have a 70% dextrose solution. How many grams of dextrose are in 400ml?

    asked by melissa on March 9, 2008
  92. Chem 121

    How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

    asked by Barbara on July 26, 2011
  93. CHEMISTRY

    1. The use of a more dilute NaOH solution for the standardization of NaOH.

    asked by MM on January 16, 2012
  94. Math

    Write an inequality and provide a value that may or may not be a solution to the inequality.

    asked by jay jay on September 3, 2008
  95. algebra 2

    how do i work this 3x2-2x-8=0 the solution is -6 and 4 how do you work this out for my class

    asked by kay on January 18, 2012
  96. algebra

    Can you give me and example of an inequality and provide a value that may or may not be a solution to the inequality?

    asked by C on April 5, 2008
  97. Biology

    You need 25ml of 2% milk solution (v/v. How much milk and water will you need?

    asked by Anonymous on January 19, 2015
  98. Algebra

    WRITE AN INEQUALITY AND PROVIDE A VALUE THAT MAY OR MAY NOT BE A SOLUTION TO THE INEQUALITY

    asked by olabisi on August 5, 2008
  99. Trig

    The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}

    asked by Lenny on December 13, 2011
  100. Chemistry

    What is the mass of a 8.64% (m/m) AlCl3 solution containing 7.59g AlCl3?

    asked by Elaine on February 7, 2013