1. Chemistry

    What volume (mL) of the solute ethanol should be combines with 2.44L of the solvent H2O to prepare a solution that is 8.03m ethanol?

    asked by Lisa on June 6, 2010
  2. physiology

    how many grams of glucose (180grams/mole) to make a 13% glucose solution with a final volume of 600 milliters.

    asked by sam on February 20, 2017
  3. chemistry

    If K = 1.8 x 10 for HC2H3O (aq) H+(aq)+C2H3O2-(aq), and 100 mL of aqueous solution has [HC2H3O2] = 0.50 M, [H+] = 0.090 M, and [C2H3O2-] 0.0010 M, is the system at equilibrium?

    asked by alexis on July 27, 2008
  4. calculus

    If 0 degrees < x < 180 degrees, what values of x, to the nearest degree, are the solution to the equation 2tan to the square x + 5tanx - 12 = 0

    asked by John on March 7, 2012
  5. Chemistry

    What volume (mL) of the solvent benzene should be added to 142 mL of the solute CH3CN to generate a solution that is 2.68% by mass CH3CN?

    asked by Scott on September 2, 2008
  6. chemistry

    What is the molality of a solution composed of 25ml og toluene C6H5CH3 ( density=0.866g/ml) in 75 ml of benzene ( density=0.879g/ml)

    asked by gabriela on April 10, 2017
  7. Chemistry

    How do I calculate number of moles of K2C2O4 in 20mL of a saturated (300g K2C2O4.H2O per liter) solution....

    asked by Chan on September 16, 2010
  8. Trigonometry (Coterminal Angles)

    What is the SMALLEST POSITIVE ANGLE that is coterminal with the angle having the radian measure of -10π/3? Is there any solution for this kind of question?

    asked by Bryle on February 20, 2015
  9. Maths

    By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

    asked by Lauren on October 27, 2016
  10. Chem

    I did an experiment for creating an ester. So basically I added an acid to an alcohol. We were to also add H2SO4 solution. Why did we add that?

    asked by Lena on March 25, 2009
  11. HELPPPPPPP (TRIG)

    find, to the nearest minute, the solution set of 1- sin x = 3 cos^2 x over the domain 0 degrees to 360 degrees

    asked by HELPPPP on May 20, 2010
  12. science

    a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample

    asked by Nikita on February 11, 2016
  13. Chemistry

    how many grams of CaCl2 would be required to be added to water to prepare 1 liter (1000 ml) of a 1.72% (w/v) aqueous solution of CaCl2?

    asked by Tia on April 27, 2011
  14. ALGEBRA

    I also have an answer for this one. Just need to be sure. Says to solve then graph. x +9>2; x + 9 - 9> 2 - 9 x > - 7. I believe this means anything to the right of -7 could be a solution. I would graph this with an open circle at -7 and shade to the right

    asked by Jessica 2 on November 4, 2010
  15. Math

    A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

    asked by Bob on April 26, 2013
  16. chem

    How many grams of CaCl2 would be required to be added to water to prepare 1 Liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?

    asked by ALEX9 on April 25, 2011
  17. math

    Which of the values is in the solution set for the inequality -8-7x>6 It is multiple choice A=-1 b=-2 c=-3 d=2 I did this: -8-7x>6 add 8 to each side -7x>14 -7/-7>14/-7 x

    asked by b6 on January 4, 2013
  18. chemistry

    A 0.500M solution of a weak acid, HX, is only partially ionized. The [H+] was found to be 4.02 x 10^-3 M. Find the dissociation constant for this acid.

    asked by kayla on August 5, 2008
  19. chemistry

    calculate the hydroxide ion concentration in a solution of almond extract PH.3.8.state if almond is basic or acid

    asked by demi on April 25, 2013
  20. chemistry

    A 100.0 ml aqeuous solution that contains 0.50 g of hemoglobin has an osmotic pressure of 0.00178 atm. What is the molar mass of hemoglobin?

    asked by victoria on February 16, 2015
  21. chemistry

    what is the freezing point of a solution that contains 20.2g of urea CO(NH2)2 in 295mL water? Assume a density of water of 1.00g/mL

    asked by jennifer on June 14, 2015
  22. Math

    A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

    asked by Bob on April 26, 2013
  23. Math

    A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

    asked by Bob on April 26, 2013
  24. Math

    One of two similar triangles has an area of 1/4 times that of the other. What is the ratio of its perimeter of the triangles? (I know the answer but I don't know the solution, please explain. Thank you very much!!)

    asked by Anonymous on February 22, 2015
  25. Please HELP CHEM

    How many grams of CaCl2 would be required to be added to water to prepare 1liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?

    asked by Tina on April 28, 2011
  26. science

    a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample

    asked by Anonymous on February 11, 2016
  27. chemistry

    Calculate the mass of sodium phosphate required to prepare 1.75 L of solution in which the sodium ion concentration is 0.25 mol/L

    asked by Zilly on January 8, 2015
  28. Chemistry

    What is the pH of a 0.051 M solution of Phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 x 10-2 and the value of Ka2 is 7.000 x 10-7.

    asked by Summer on January 17, 2012
  29. chemistry

    If 60 grams of KCl can be dissolved in 100 grams water. Would the remaining solution be unsaturated, saturated, or supersaturated?

    asked by Amanda on December 6, 2010
  30. Chemistry

    When one of the following substances is dissolved in water, the only positive ions in the solution are hydrogen ions. CH3OH LiOH PO4 -3 CO 3 -2

    asked by Christian on February 25, 2012
  31. algebra

    1. the function f(x)=6x/3x-5 is one to one. find its inverse and check your answer. And on the second one can you tell me if I am correct. 2. solve the following exponential solution 7^2x+7^x+1-60=0 7^2 x+7^x-59=0 (49x)+7^x-59=0 49x/49=0/49 x=0/49 x=0

    asked by Heather-two questions please help on December 1, 2012
  32. English Ms Sue

    How does social norms change war as a social disease versus non-conformity? What would be a possible solution to solve this problem?

    asked by Michele on February 17, 2009
  33. Alegebra

    For a science project, Tyronce is misxing a solution that is 6 parts of sugar to 25 parts of water. How would you wirte this as a decimal

    asked by Michelle on February 17, 2009
  34. chemistry

    What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water? Just making sure would it be 11.1 divided by 2269.2 times 100?

    asked by Brianna on February 19, 2017
  35. math

    Solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.) 5x2 = 9x + 2

    asked by Anonymous on January 22, 2012
  36. Chemisty

    By titration it is found that 12.1 mL of 0.130 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

    asked by Tara on April 27, 2016
  37. college general chemistry 2

    a chemist titrates 70 ml of .7889M HClO solution with .6221M KOH. calculate pH at equivalence. pKa of HClO is 7.50 I am getting pH of 17.72 Is that right?

    asked by osp on April 3, 2016
  38. ALGEBRA

    Beagleboy how do I explain that in 50 words? Post your 50-word response to the following: Explain why the equation -6(x + 3) = -6x + 5 has no solution and 7x +18 + 8x = 8(x + 4) + 7x – 14 has infinitely many solutions.

    asked by SAMANTHA on March 8, 2010
  39. chemistry

    Calculate the molality (m) of CH2Cl2 in a solution generated by combining 846 g of the solute CH2Cl2 with 11.2 L of the solvent ethanol.

    asked by eng on January 20, 2010
  40. Chemistry

    a 0.451 L solution of 1.71 ascorbic acid (ka1=7.9E-5, ka2=1.6E-12) is titrated with 1.35 M NaOH. What is pH when 0.9540 L of NaOH is added?

    asked by Chris on December 11, 2012
  41. Chemistry

    What is the pH change when 27.6 mL of 0.0920 M is added to 94.1 mL of a buffer solution consisting of 0.146 M and 0.174 M ? ( for ammonium ion is .) pH change =

    asked by Anonymous on April 26, 2016
  42. CHEMISTRY - SCIENCE

    What is the molality of a solution of 50g of I2 (iodine) dissolved in 130 mL of propane. Propane density .49g/mol.

    asked by chevy on February 25, 2014
  43. Math

    5. Find the solution to the system of equations by using either graphing or substitution. y = 6 – x and y = x – 2 (2, 4) (–4, 2) (4, 2) no solutions 6. y = 2x – 1 and y = x + 3 (1 point)(4, 7) (7, 4) (–7, –4) infinite solutions 7. y = 4x and y

    asked by Mr.Brain on May 2, 2013
  44. Physical Science

    Determine the concentration of the HCl in a swimming pool?given 100ml of a standard solution of Na2CO3 of concentration 0.05mol.dm

    asked by kimberly on May 26, 2011
  45. chemistry

    calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water

    asked by Sara on March 22, 2014
  46. Chemistry

    Given an unknown mixture consisting of two or more substances, explain how we could determine whether that mixture is a true solution, a colloid, or a suspension

    asked by Anonymous on March 11, 2010
  47. Science

    When water is mixed with another substance and the mixture will not scatter light, the mixture is a:? 1) suspension  2) compound  3) solution  4) substrate 

    asked by Jen on February 25, 2018
  48. Chemistry

    in a particular redox reaction, Cr is oxidized to CrO42- and Ag+ is reduced to Ag. Complete and balance the equation for this reaction in acidic solution.

    asked by Anonymous on December 4, 2015
  49. Chemistry

    WHAT IS THE BOILING POINT OF THIS SOLUTION? 1.00x10^2g C10,H8,O6,S2 (1,5-naphthalenedisulfonic acid) in 1.00x10^2g H2O (nonionizing solute)

    asked by Jose Reyes on December 7, 2010
  50. chemistry

    10.0 mg of a certain protein were dissolved in water to make a solution of 3.50 mL at 28.0o C. If the osmotic pressure is 1.30 torr, what is the molar mass of the protein?

    asked by lizz on October 15, 2010
  51. Math

    A nurse has two solutions that contain different concentrations of a certain medication. One is a 20% concentration and the other is a 5% concentration. How many cubic centimeters of each should he mix to obtain 10 cc of a 18.5% solution?

    asked by Cheyenne on September 6, 2017
  52. i really, really, really need help

    what coordinate point is the solution to the system? {3x+2y=8 {x-y=1 (2,1) please don't think i just made that up, it's correct. you have to use substitution, when you do solve for x and y, you get: x= y+1 and y=x-1, plug in y for 3x+2y=8 and you get: y=1,

    asked by andrea on February 22, 2007
  53. Chemistry

    If you dissolve 13.5 g of malic acid, C4H6O5, in half a liter of water (0.500 L), what is the molarity of the acid in the solution?

    asked by Ashley on May 4, 2014
  54. Chemistry

    1. Show quantitatively how you would prepare a solution of 3.10 x 10^2 g of 0.125 molar (m) ethylene alcohol from ethylene glycol and water.

    asked by eddy on August 3, 2011
  55. chemistry

    What is the molality of a solution prepared by dissolving 75.2 g of ethylene glycol, HOCH2CH2OH, in 1.34 L of water? Assume the density of water is 1.00 g/ml.

    asked by Silvie on November 17, 2011
  56. Algebra

    Solve the system of equations: First:x+3y=5 Second:3x-y=5 multiply the second equation by 3 then add both equations(I know I have it wrong somewhere I just guessed at the solution and it worked. I got (2,1)

    asked by Jon on February 26, 2008
  57. Chemistry

    What is the molality of a solution prepared by dissolving 81.5 g of ethylene glycol, HOCH2CH2OH, in 1.36 L of water? Assume the density of water is 1.00 g/ml.

    asked by Silvie on November 17, 2011
  58. chemistry

    Would it be feasible to store a solution of copper sulfate in a container made of metallic zinc? Of metallic silver?

    asked by Anonymous on May 14, 2019
  59. Vectors

    determine the number of solutions, the generalized parametric solution, and explain why there are no integer solutions for the equation 2x+10y=31

    asked by Sara on March 17, 2015
  60. Chemistry

    How many grams of CaCl2 are needed to make 100ml of a 15% solution in water if only the dihydrated (CaCl2⋅2 H2O) salt is available?

    asked by Yue on May 18, 2014
  61. Chemistry

    What is the [S^-2] in a saturated solution (.1 M) of H2S, in which the pH had been adjusted to 5.00 by the addition of NaOH? For H2S, Ka1= 1.1X10^-7 and Ka2=1.0X10^-14

    asked by Kate on February 13, 2011
  62. chem class

    A 25.00-mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 10.0 mL of KOH is ???? M.

    asked by richard on November 23, 2010
  63. Chemistry

    Hi, wondering if anyone can help with the following problem: A solution of NH3 (kb=1.8x10^-5) has a ph of 11. what is the molar concentration of NAOH? I am unsure how to go about this however i have tried [10^-3][10^-11]/ 1.8x10^-5 with no success. Thanks

    asked by Frank on November 28, 2016
  64. Chemistry

    If the solubility constant for Ag2CO3 is equal to 8.1x10^-12 how many grams of Ag2CO3 will dissolve in a .0001 M solution of Na2CO3?

    asked by Jack on April 17, 2014
  65. chemistry

    Find the concentration of Ag^+ in a saturated solution of AgBrO_3_ that also contains 0.02M LiNO_3_, .02M KClO_4_ and .01M NaF

    asked by holly on March 9, 2013
  66. calculus

    Find the general solution of this de (1+cosx)y'=sinx(sinx+sinxcosx-y) I need full step have tried but nothing good is coming out

    asked by matt on April 25, 2019
  67. Algebra

    a car rents for $40 per day plus 21cent per mile. You are on a daily budget of $82. What mileage will allow you to stay within your budget? The solution is

    asked by Lady t on July 30, 2010
  68. chemistry

    A bottle containing a standard solution of KMnO4 is found to have brown stains on the inside. Why will this KMnO4 be of no further use for quantitative experiments?

    asked by red on May 2, 2010
  69. math

    40% of k liters of acid are added to 60% of w liters of water. Write an algebraic expression for the total volume of the solution.

    asked by Anonymous on January 9, 2017
  70. Chemistry

    What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

    asked by Jake on February 20, 2011
  71. analytical chemistry

    compund x is known to absorb at 510nm. If you dilute a solution containing x by 1/4, by how much does the absorbance increase or decrease. if it stays the same just state it stays the same.why

    asked by ami on March 26, 2013
  72. Chemistry

    Calculate the mass (in grams) of sugar, C12H22O11, in 142.4 mL of a 1.39 M solution of sugar. (atomic weights: C = 12.01, H = 1.008, O = 16.00)

    asked by Nora on November 7, 2014
  73. Chemistry

    In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species. (most to least) H2O HClO H3O OH- OCl-

    asked by Paula on March 9, 2013
  74. Math

    Got quite a silly question, but wondering if anyone knows the solution. Find the sum of the two missing numbers in the sequence 4, 3, 3, 2, 3, 3, 7, 7, 2, _,_ a)10 b)8 c)11 d)7 e)6 Cant seem to find the pattern here, can anyone see it?

    asked by Alex on November 27, 2018
  75. chemistry

    Acetic acid (CH3CO2H) is a weak acid. As a result, a solution of sodium acetate (NaCH3CO2) will be _____.

    asked by ana on January 6, 2014
  76. Chemistry

    What mass of water must be used to dissolve 20.0 grams of ethanol, C2H5OH, to prepare a 0.0500 molal solution of ethanol?

    asked by Marcus on February 10, 2013
  77. Chemistry

    Find the pH of 1.0M Na2SO3(aq) solution at 25 degrees Celsius. I am not sure how to start this problem. I started off by doing 1.0M = x/1000 to get x=0.001 but I do not know if this is how to start.

    asked by Hannah on April 3, 2012
  78. Chemistry

    What is the PH of an aqueous solution consisting of 0.070 M formic acid (HCOOH) and 0.070 M sodium formate (HCOONa)?

    asked by Leroy on November 19, 2014
  79. Chemistry

    Calculate the mass of sodium sulfate decahydrate need to make a 500ml solution that is .025m in sulfate anion?

    asked by Pam on October 26, 2011
  80. chemistry

    determine the concentration of NH3(aq) that is required to dissolve 775 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.] please help!!!!!!!

    asked by maggie on April 3, 2015
  81. Chemistry AP

    How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate?

    asked by Angel on December 27, 2016
  82. osu

    a 50.0 ml sample of a 15% (m/v) solution of H2SO4 is added to water to give a final volume of 250.0 ml. What would the final concentration be?

    asked by Kat on November 23, 2010
  83. Chemistry

    why does the value of i (van t' hoff factor) change with regards to theoretical vs. experimental? i'm not quite sure what happens but i know it has to do with ions in the solution. could it be attractive forces between ions?

    asked by Jonathan on February 14, 2008
  84. chemistry

    If the concentration of Pb^2+ is known to be roughly 2.1 x 10 to the power of -9 mol/L within a saturated solution of Pb(PO4)2, calculate the Ksp of Pb3(PO4)2?

    asked by Angelo on April 9, 2008
  85. Chemistry

    In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from most to least: HClO, OCl, OH^-, H30^+, H20

    asked by Ethan on February 21, 2013
  86. Chemistry

    6.00 g of hemoglobin was dissolved in 250.0 mL of solution. The resulting osmotic pressure was 6.80 mmHg at 23.0C. what is the molar mass of hemoglobin?

    asked by libby on June 10, 2018
  87. chemistry

    Explain how you would prepare the following dilute solutions from the more concentrated ones: a. 200ml of .500M HCL from a 6.00M HCL solution.

    asked by cameron on April 4, 2011
  88. Chemistry

    100 mL of LiNO3, 0.241 M is mixed with 240 mL of 0.618 M Ca(NO3)2. What is the final concentration of NO3- in the solution?

    asked by Matt6 on November 25, 2014
  89. chemistry

    By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution

    asked by Morgan on April 27, 2014
  90. algebra

    Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2+bx+c=0. Solution:2

    asked by Terry on April 8, 2012
  91. chemistry

    A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. a)what is the molar mass of sucrose? How would i do that??

    asked by Miley on April 5, 2008
  92. chemistry

    By titration it is found that 66.1 mL of 0.125 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

    asked by trae on April 23, 2012
  93. chemistry

    What products are formed when sucrose is heated in an aqueous sulfuric acid solution? What role does the acid play?

    asked by drew on January 16, 2011
  94. Chemistry

    Calculate how many grams of FeSO4.7 H2O (MW = 278.02 g/mol) will be needed to prepare 1 mL of a 0.2 M FeSO4 solution? Is that .0304g?

    asked by Feufolia on February 25, 2016
  95. chemistry

    What is the concentration of silver(I) ion in a saturated solution of silver(I) carbonate containing 0.0092 M Na2CO3? For Ag2CO3, Ksp = 8.6 × 10–12.

    asked by Anonymous on May 3, 2010
  96. chemistry

    What are the freezing point and boiling point of an aqueous solution of 15.5 g glucose(C6H12O6) dissolved in 150 g of water?

    asked by Daniel on April 7, 2013
  97. Math

    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 I think it's horizontal Correct

    asked by Queen on April 10, 2016
  98. Environmental

    I have to write a paper on an environmental problem and expand on a (or two) solution to the problem... any ideas? Anything specific would be great since I'm at a stand still...

    asked by Jessy-Leigh on December 3, 2007
  99. Chemistry

    A solution has a hydroxide-ion concentration of 7.48X10-5 M. What is it's hydronium-ion centration? I have no idea where to begin on this question...

    asked by Robby on February 18, 2013
  100. chemistry

    Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.

    asked by Jessica on February 19, 2011