1. chemistry

    What is the original molarity of a solution of formic acid (HCOOH) whose pH is 3.74 at equilibrium? ka =1.7x10^-4

    asked by rodrigue on February 19, 2010
  2. physics

    how long does a car with an acceleration of 2.0 m/s^2 take to go from 10m/s to 30m/s?and show the solution how do you get the answer.

    asked by ricajane on November 24, 2011
  3. Chemistry

    Name the product formed when carbon two oxide is passed into potassium hydroxide solution.

    asked by Yaseerah on May 20, 2015
  4. chemistry

    How would you prepare a solution of about 8mg/100ml of ascorbic acid in water (25ml)?

    asked by solution chemistry on February 21, 2014
  5. Chemistry

    At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

    asked by Jude on February 12, 2009
  6. Math Help?! 7th grade.

    1. Determine which ordered pair is a solution of y = x*2–2. (5, 21), (–5, 24), (–1, –1), (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither.

    asked by Katerina on April 19, 2013
  7. chemistry

    describe the detailed procedure of how to prepare 500 ml of 1M of sodium acetate solution.

    asked by Diinho on August 22, 2013
  8. Chemistry

    Is "a color of solution becoming less intense due to dilution" maybe evidence of chemical reaction or not?

    asked by Anonymous on November 21, 2016
  9. Linear equations

    I keep getting this wrong and can't figure out why {60x+10y=-16 -50x-100y=50 The solution to the system is:

    asked by Carlos on April 7, 2017
  10. Chemistry

    How many grams of lithium nitrate, LiNO3, are required to prepare 3.00 × 102 mL of 2.00 × 10–1 M solution?

    asked by Chris on May 12, 2010
  11. Science

    1. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25°C. Will a precipitate be formed?

    asked by Rachel on December 8, 2015
  12. chemistry

    The volume of 0.025M Ca(OH)2 solution which can neutralise 100ml of0.0001M H3PO4

    asked by Arun on August 31, 2015
  13. chemistry

    6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

    asked by jeff on May 11, 2010
  14. science

    If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked by Andrea on April 18, 2013
  15. Chem

    what is the hydronium-ion concentration at equilibrium in a 0.71 M solution of aniline (Kb=4.2x10^-10) at 25 Celsius

    asked by Che on March 19, 2013
  16. Chem

    what is the percent ionization at equilibrium in a 0.31M solution of dimethylamine (Kb=4.2x10^-10) at 25 Celsius

    asked by Che on March 19, 2013
  17. Math

    A manchine prints 1500 newspaper in 45 minutes . How many will it print in 2 hours solution?

    asked by Sandhya Pandey on November 12, 2016
  18. chemistry

    How many g of NaOH is needed to make 300.0 mL of a 20 % (w/v) solution? please please show all work I'm very lost

    asked by Thomas Ruger on April 2, 2017
  19. chem

    How many grams of SO2 are needed to make 250 ml of 0.750 molar solution?

    asked by Karen on August 28, 2012
  20. Chemistry

    How many grams of SO3 are needed to make 250 ml of 0.750 molar solution?

    asked by Karen on August 28, 2012
  21. Chemistry

    How many g of NaOH is needed to make 300.0 mL of a 20 % (w/v) solution? I'm so lost right now I have absolutely no clue

    asked by Thomas Ruger on April 2, 2017
  22. Chemistry

    What volume of a 0.600 M solution of AgClO4 is needed to produce 160g of AgCr04?

    asked by Tara on September 27, 2010
  23. chem

    The ion product Of D2O is 1.35x 10^-15 at 25 degrees C. For a solution to be acidic the PDF must be what?

    asked by court on April 22, 2012
  24. Chemistry

    100 ml of 0.01N HCl is added to 0.9L of distilled water. What would the final pH of the solution be?

    asked by Kristin on August 30, 2012
  25. Chemistry

    A student mixes 45.0 ml of .150 M HCL with 30.0 ml of .200 M NaOH. What is the pH of the resulting solution?

    asked by Juliano on February 10, 2012
  26. Algebra

    Could someone please help me with this problem? Solve using the multiplication principle. Don't forget to check. -z=35. The solution is z=

    asked by B.B. on February 22, 2010
  27. Chemistry

    What is the concentration of the SCN- ion in the stock solution of 2.00 x 10-3 M NaSCN in 0.10M HNO3?

    asked by noah on March 7, 2012
  28. Chemistry

    How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

    asked by Kris on September 15, 2013
  29. Chemistry help needed

    How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

    asked by Kris on September 15, 2013
  30. Chemistry help please

    How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

    asked by Kris on September 16, 2013
  31. chemistry

    Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

    asked by Laura on February 12, 2012
  32. chemistry

    What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?

    asked by lulu on March 20, 2016
  33. science

    Briefly describe how you would prepare 500cm of 1mole of NaCl solution in the laboratory.(Na-23,Cl-35.5)

    asked by Precious Appiah on March 18, 2016
  34. chemistry

    Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

    asked by Laura on February 12, 2012
  35. Chemistry

    ? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.

    asked by Riley on April 7, 2008
  36. Chemistry

    What would happen to the color of a dilute solution containing FeCL4 if you added concentrated HCl?

    asked by Christina on April 26, 2010
  37. AED

    How might that be a solution to dealing with instruction and assessments of varying levels of language development?

    asked by NENAS on June 24, 2009
  38. chemistry

    In an electrolytic solution the density of CuSO4 decreases or increases or remains constant?

    asked by prashant on September 12, 2016
  39. chemistry

    Convert .25 L of a .025 M solution of NaCL starting with solid NaCI and water

    asked by mj on February 13, 2012
  40. Math

    1. Solve each inequality and express the solution set in interval notation. a. 3 < |(x-3)/2| < 5 b. 5 ≥ |(x+2)/3| > 1 2. 4 < 2x-8 ≤ 10 ans.: (a)(9,-3) (-7,13) (b) [-17,13] (1,-5) 2. (6,9]

    asked by NR on October 30, 2016
  41. Math

    Solve each inequality and express the solution set in interval notation. a. 3 < |(x-3)/2| < 5 b. 5 ≥ |(x+2)/3| > 1 ans.: (a)(9,-3) (-7,13) (b) [-17,13] (1,-5)

    asked by NR on October 30, 2016
  42. Chemistry

    (a) How many grams of KNO3 are needed to make 430 mL of a solution that is to contain 2.9 mg/mL of potassium ion?

    asked by Mark on June 3, 2015
  43. chemistry

    Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

    asked by Laura on February 12, 2012
  44. Chemistry

    What is the solubility of X in mol/dm3 if 25cm3 of its saturated solution contains 4.0g of X (Molar mass of X=60)

    asked by Toyety on March 21, 2016
  45. algebra

    what is the solution of the following linear system? -5x - 5y = -6 -5/2x - 5/2y = -6 a) none b) (-2,2) c)(-,2,-2) d) infinite number of solutions and the answer i picked was a or d thanks :)

    asked by poo on May 2, 2010
  46. algebra

    what is the solution of the following linear system? -5x - 5y = -6 -5/2x - 5/2y = -6 a) none b) (-2,2) c)(-,2,-2) d) infinite number of solutions and the answer i picked was a or d thanks :)

    asked by poo on May 1, 2010
  47. algebra

    what is the solution of the following linear system ? 8x + 3y = 1 x + 5y = 14 a)(2,3) b)(-1,3) c) none d) infinite number of solutions and the answer i picked was b thank you!!!!!!!!!!

    asked by poo on May 1, 2010
  48. Calc 2

    Find the solution of the differential equation that satisfies the given initial condition. du/dt= (2t + sec^2(t))/(2u), u(0) = −4

    asked by TayB on March 29, 2016
  49. math

    solve the system of equations algebraically for real values of x and y { x+y=16 x^2+y^2=128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

    asked by laura on August 29, 2016
  50. Chemistry

    What mass, in grams, of sodium chloride is needed to prepare 15.0 ml of 10% (m/v) NaCl solution?

    asked by Irene on November 2, 2016
  51. chem

    Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c

    asked by Help on April 28, 2010
  52. Trig

    Find the general solution for the equation 4tanx+cotx=5?????? and the steps please? THANYOO!

    asked by Valerie on October 18, 2010
  53. Chem

    I need to find the Kb of Analine. I've been told the ph is 8.81 and that the concentration of the solution is 0.1 mol/L. What would be the equation I'm working with :S ?

    asked by Lena on July 26, 2009
  54. Chemisrty

    what mass of sodium phosphate is required to make 250mL of 0.10mol/L solution?

    asked by Jenna on February 22, 2010
  55. Rainy can you help me with this question?!

    find the values of x and y that will make the matrix equal [x y] 1 9 = [3 5] 1 9 the answer options are a. x=-3 y=-5 b. x=5 y=3 c. x=-3 y=5 d. x=3 y=5 e. no solution

    asked by jessie on August 30, 2016
  56. math homework help please?!!

    solve the system of equations algebraically for real values of x and y { x + y = 16 x^2 + y^2 = 128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

    asked by ottilie on August 30, 2016
  57. chemistry

    if 4.4 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked by scott on November 21, 2011
  58. Chemistry

    What is the pH of a solution obtained by adding 15 g deK2SO4em 150 ml NaHSO4 with Molarity of 0, 2 m. HSO4 Ka = 1, 3.10^-2

    asked by Arya on March 26, 2016
  59. math

    list two congruence conditions for the law of sines yields a unique solution

    asked by carol on April 27, 2010
  60. SCIENCE

    HELP ME!! EVERYONE IS MAD AT ME BCUZ THEY THINK I AM YELLING AT THEM BUT REALLY MY COMPUTER WILL ONLY DO BIG LETTERS! IF THERE IS A SOLUTION TO THIS PLEASE HELP ME. THIS IS NOT A JOKE.

    asked by SAMMI on October 4, 2010
  61. Science

    Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

    asked by Kamal on April 29, 2013
  62. chemstry

    What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?

    asked by michelle on November 15, 2012
  63. science

    what volume of 0.115 M HClO4 solution is needed to neutralize 50.00 ml of o.o875 M NaOH?

    asked by yvaine on September 7, 2017
  64. biology/chem

    How many grams of glucose (MW = 180 g) should we dissolve in one liter of water to get 1 molar solution?

    asked by nicole on January 19, 2011
  65. Chemistry

    How would the freezing point of a solution change if the unknown had ionized or dissociated? Explain.

    asked by G on March 14, 2011
  66. chemistry

    what is the PH of a solution containing .03 M of acetic acid and .3 mole of sodium acetate (CH3COONa) ? Ka for CH3COOH = 1.8*10^-5

    asked by mas on May 17, 2014
  67. Calculus

    Solve the differential equation. t(dy/dt) + 2y= t^3 t>0, y(1)=0 I think I solved it properly, I'm just trying to check my final solution.

    asked by Rachel on February 15, 2011
  68. chemistry

    What mass of KCl (MM = 74.55 g/mol) is required to make 550 mL of a 0.250 M solution?

    asked by Cassie on November 10, 2014
  69. chemistry

    The concentration of a solution made by diluting 10.0 mL of 0.685 mol/L NaBr to 300 mL is

    asked by ronnie on March 16, 2015
  70. Chem

    What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

    asked by IH on November 28, 2010
  71. Chem

    What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

    asked by IH on November 28, 2010
  72. Chemistry

    What will be the molarity of the resultant solution obtained by mixing equal volumes of 1M and 5M ofNaOH.

    asked by Shivani on September 10, 2017
  73. Chemistry

    Show, with equations, why the solution from which BaSo4 is precipitated cannot be allowed to be more then 0.01-0.05M in HCl.

    asked by Brittney on February 16, 2011
  74. science

    when phenolphthalein is added to ammonium hydroxide the color of the final solution is pink?

    asked by kleanface on October 31, 2012
  75. chemistry

    23 grams of NaOH is dissolved in 1.5L of water, find; a)Concentration of the solution b)pOH c)pH

    asked by Patrick on January 20, 2013
  76. chemistry

    What mass of KCl (MM = 74.55 g/mol) is required to make 750 mL of a 0.275 M solution?

    asked by Brendon on November 10, 2014
  77. chemistry

    How many grams of potassium permangate are needed to decolorized 1g of 2-pentene in basic solution

    asked by john on October 4, 2011
  78. chemistry

    If you start out with a 0.4M solution of Histidine at pH 6 and add an equal volume of 0.1M HCl, what would the final pH be?

    asked by Ryan on February 15, 2011
  79. MATH ALGEBRA

    How would u figure this question out? Does this system of linear equation have a solution of (-3,4)? 2x-3 = 6 y = 3x-13 Do u just substitute the numbers or something?

    asked by Anonymous on January 19, 2011
  80. Math

    Is the (4, 1) a solution to the equation y = -x + 3? I honestly have no idea what this means. Does y = 4 and 1 = -x? If not then the answer should be no since (4, 1) is part of a graph

    asked by NotAFan on September 5, 2017
  81. Analytical Chemistry

    How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

    asked by AREEJ on November 30, 2012
  82. differential equations

    dy/dx=4x/y..verify that the straight lines y=2x are solution curves, provided x doesnt equal 0.

    asked by siddh on January 9, 2013
  83. chemistry

    what is the new boiling point for a solution prepared from 1.40 mol of KCI 1.00kg of water?

    asked by lkra on October 8, 2011
  84. Chemistry

    Why is the solubility of KHTar greater in a 0.10M NaNO3 solution than in distilled water?

    asked by Becky on July 14, 2011
  85. chemistry

    what mass in grams of sodium nitrate is needed to make 85.o ml of a 0.2500 m solution

    asked by andrew b on March 15, 2011
  86. Chemistry

    What is the pH of a 0.085 M solution of nitrous acid (HNO2) that has a Ka of 4.5 × 10^-4? 2.21 5.33 3.35 4.42 I am not the best at working through the problems, but I came to A, 2.21, given the concentration and Ka.

    asked by Jameson on May 7, 2018
  87. Chemistry

    How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?

    asked by Hannah on February 13, 2011
  88. chemistry

    What mass of AgCl will be obtained by adding an excess of HCl to a solution of 0.34 g of AgNO3 ?

    asked by Joyeeta on December 18, 2014
  89. Chemistry

    What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

    asked by Lucy on November 18, 2007
  90. math

    What are the steps to the solution for this problem? What is the difference between 330 and half n equals 114?

    asked by Sandra on April 13, 2011
  91. Math

    What are the restrictions on x if the solution to the equation -4 - square root 4-x=6 involves real numbers?

    asked by Alex on October 10, 2014
  92. Chemistry I

    Determine the hydronium ion concentration in a solution that is 0.00018 M Ca(OH)2. Answer in units of M

    asked by Ashleigh on March 11, 2013
  93. college math

    how many grams of NaOH are needed to make a 30% w/w solution using deionized water as the solvent

    asked by Wanda on November 28, 2010
  94. chem

    What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175 M solution

    asked by whitney on April 12, 2011
  95. chemistry

    What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?

    asked by Tom on April 20, 2011
  96. intergrated math

    Solve the equation for x. Write the solution set 3x2 + 5x2 – x – 7x2 = 0

    asked by aj on May 17, 2011
  97. Chemistry

    A solution that has an osmotic pressure greater than that of red blood cells is called?

    asked by Ann on November 29, 2010
  98. Chemistry HELP

    If 150.0 mL of 1.00 M C6H12O6 are diluted to 750.0 mL, what is the molarity of the final solution? ____ M?

    asked by MBH on October 3, 2011
  99. Chemistry

    How many moles of NH4Cl must be added to 1.5L of 0.2 M solution of NH3 to form a buffer whose PH is 9.(Kb=1.8x10^-5)

    asked by Zekariyas on December 7, 2017
  100. Pre-Calculus/Trigonometry

    Solve the following system of equations algebraically. Verify the solution by using matrices. 8x-2y=5 -12x+3y=7

    asked by Anonymous on September 30, 2014

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