1. Chemistry

    a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

    asked by Dawn on June 1, 2016
  2. Chemistry

    Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.

    asked by Jematormal91 on April 5, 2012
  3. chemistry

    0.947 moles of NaC2H3O2 dissolved in 100 mL solution

    asked by chem on April 16, 2015
  4. Chemestry

    Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

    asked by Becky on November 23, 2012
  5. Algebra 1A

    When graphing the inequalities 9x+8y

    asked by Kim on July 3, 2013
  6. Chemistry

    when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution

    asked by Leah on April 17, 2011
  7. chemistry

    how many kg of h20 must be added to 75.5g of Ca(NO3)2 to form a 0.500 m solution?

    asked by lynda smith on November 18, 2009
  8. Med lab tech

    how many grams of KCL are required to make 5.0ml of a 35% w/v solution?

    asked by billie on November 27, 2010
  9. chemistry

    What is the %v/v concentration of a solution made by adding 25 ml of acetone to 75 ml of water?

    asked by william on July 22, 2018
  10. Chemistry

    What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0 X 10-15. a) 4.7 b) 7.2 c) 9.0 d) 9.1 e) 9.3 What should I do to solve for this? Thank you

    asked by Sheri on April 5, 2012
  11. chemistry

    What is the final volume in milliliters when 0.700L of a 46.9% (m/v) solution is diluted to 20.1% (m/v)?

    asked by nancy on October 16, 2013
  12. math

    find the genearal solution of the following equation 4csc^2x-7=cotx

    asked by beracah on May 20, 2016
  13. 5th grade

    can a solution be made by mixing a solid, liquid and a gas?

    asked by Jon on October 7, 2010
  14. Science

    In an acidic solution, why is the OH- concentration lower than it is in pure water?

    asked by Sheryl on October 22, 2011
  15. Science

    The formula wt of h2so4 is98bthe wt of the acid in 400ml of 0.1M solution is

    asked by Anonymous on September 5, 2017
  16. biology lab

    how many grams of mercury II Nitrate will you need to prepare 500mL of a .60 M solution ?

    asked by nicole on February 24, 2017
  17. Biology- PLEASE HELP ME ):

    how does the salinity of a solution affect osmosis in an onion cell?

    asked by Kasey on March 1, 2011
  18. Saint Louis University

    Let f(x,y)=sqrt((x-a)^2+(y-b)^2+(z-c)^2). Minimize f subject to Ax+By+Cz+D=0. what is the geometric meaning of your solution?

    asked by Micx on March 2, 2011
  19. Algebra

    Write the solution set of the inequality |x + 2| < 5 in the interval notation.

    asked by Kim on September 30, 2014
  20. trig

    Complete the general solution to y = arcsin -. y=____±2k IM lost please help

    asked by tracy on March 24, 2010
  21. math

    use set-builder notation to describe the complete solution 5[3m-(m+6)]>-6(m-5)

    asked by jay jay on July 14, 2008
  22. Chemistry

    Please check my work: What is the pOH of a solution containing [H+] = 1x10-11 M? log H=14-11 3 right

    asked by Jeremiah on May 3, 2016
  23. Chemistry

    What is the density of a solution of 9.0% Calcium chloride dissolved in water?

    asked by Cassie on September 9, 2012
  24. chemistry

    Foe Fe(OH)2, Ksp=8 x 10^-16. What is the molar concentration of OH- in a saturated Fe(OH)2 solution?

    asked by Michelle on December 18, 2009
  25. Math

    How much milliliters must be added to 40 ml of a 10% acid solution to reduce its concentration to 4%?

    asked by Anonymous on June 24, 2016
  26. chemistry

    A solution made from 19.0 g of NaBr and 500 mL of water has what molarity?

    asked by Cindi on May 4, 2011
  27. Maths

    Solve the equation(GS general solution) 5sin^2x-3sinx-2=0

    asked by Ndaba on August 23, 2017
  28. Chemistry

    What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.

    asked by Mark on October 20, 2011
  29. CHEMISTRY

    how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

    asked by David on May 9, 2013
  30. chemistry

    which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

    asked by Jamie on April 11, 2011
  31. Further Maths

    Find the values of N for which the solution of the equations 3x+2y=Nx and 15x+4y=Nx is not unique

    asked by Adam on October 10, 2010
  32. CHEMISTRY

    how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

    asked by David on May 9, 2013
  33. Physical Science

    Milk is an example of a A.solution B.homogenous mixture C.colloid D.compound I think its a??

    asked by Chickenbreath on August 28, 2018
  34. calculus

    Which of the following is NOT a solution to cos^2 x = 3sin^2 x? 30 60 150 210 330

    asked by philly on November 27, 2012
  35. Algebra: Check Answer

    What are the solutions of the equation: x^2 + 14x = -130 ? a) 2, -16 b) 10, -13 c) -2, 16 d) no solution (~~ MY ANSWER d. ~~)

    asked by Breanna L. on February 24, 2016
  36. Chemistry-ish

    What is the pH of a solution that has a OH- concentration equal to 1x10-5M? 14-x 14-5=9 can I use that simple of math 9?

    asked by Jeremiah on May 3, 2016
  37. Maths

    How can it be possible for a set of inhomogeneous simultaneous equations to have no unique solution?

    asked by Alice on April 28, 2009
  38. Algebra

    Graph the system below and write its solution. =+3xy−6 =y−−12x1

    asked by Anonymous on October 9, 2014
  39. chemistry

    What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HC2H3O2(aq)? I got 1.3. is that correct?

    asked by ibob on April 29, 2009
  40. Chemistry

    Balance in an acidic solution: S2O3^2- +OCL =CL^- +S4O6^2-

    asked by Genelia on May 5, 2011
  41. Math

    1. Which of the following ordered pairs is a solution of the equation y=4x^2? (1 point) A. (-2, 16) ***My answer*** B. (1, -8) C. (0, -4) D. (2, -16)

    asked by Rylan on March 4, 2019
  42. science

    determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

    asked by abby on March 9, 2011
  43. Chemistry

    What mass of KBr is required to prepare 8.oo L of .400 M solution?

    asked by Nicole on September 10, 2012
  44. chemistry

    which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

    asked by Anonymous on April 11, 2011
  45. Algebra

    Write the solution in interval notation x=-2. ) What would the compound inequality look like? Thanks for the help!

    asked by Ann on June 9, 2011
  46. Calculus-HELP PLZ !!!!

    Find the complete general solution to the 2nd ODE: 9y'' + 9y' - 4y = 0

    asked by Elyse on July 22, 2013
  47. Science

    Determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

    asked by Moses on March 9, 2011
  48. Trigonometry half angles

    Tan75/2 ka solution dena sir lekin vistar se

    asked by Ravi on August 15, 2017
  49. Chemistry

    What is the pH of a 0.0054 molal solution of C2H2O4. First ionization constant K1= 6.5 x 10-2, second K2= 6.1 x 10-5.

    asked by James on March 24, 2010
  50. Chemistry

    HNO3+NaOH --- H2O+NaNO3 What is formed in the solution besides Cu(OH)2?

    asked by Ashley on October 11, 2010
  51. CHEMISTRY

    My question is that how can fe=fe(oh2)be balanced in a basic solution....THANKS IN ADVANCE.

    asked by Veronica on May 5, 2011
  52. Calculus

    Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)

    asked by Sara on July 18, 2013
  53. College Algebra

    Change 2x^2-5x=25 to standard form. Then find the solution set.

    asked by Amanda on May 5, 2011
  54. chemistry

    Which must be a mixture of substances? a- Solid b- Liquid c- Gas d- Solution

    asked by John on March 5, 2008
  55. Chemistry

    What is the chemical reaction of urea with copper nitrate solution?

    asked by Ariro Mervin on March 9, 2019
  56. Chemistry

    What is the purpose of adding distilled water to an HCl solution?

    asked by Lei on October 6, 2013
  57. chem

    What is the pH in a solution that has a concentration of 4.5x^-3 M HCl rounded to the nearest hundredth?

    asked by Tyler Clark on April 12, 2012
  58. Math

    1. Which of the following ordered pairs is a solution of the equation y=-4x^2? (1 point) (-2, 16) ***My answer*** (1, -8) (0, -4) (2, -16)

    asked by Rose on March 5, 2019
  59. calculus

    find the general solution x^2-2(e^y)dy/dx = y^3+e(x^2) i am getting the y^3 dx when i do seperation of variables how do i deal with this.

    asked by brad on December 16, 2009
  60. maths

    how can i find a general solution of g(x)when they give me g(X) =cos (x+30)and g(X)= -2sinx

    asked by mazandie Magaduzela on March 26, 2013
  61. Math

    Is the ordered pair (0,0) a solution of the direct variation equation y=kx ?

    asked by Cassidy on December 13, 2012
  62. physical science

    list two safety procedures to create a supersaturated solution

    asked by matthew on May 3, 2011
  63. chemistry

    What mass of HCL is present in 0.80 molar, 2500mL solution?

    asked by Anonymous on October 6, 2014
  64. calculus

    verify that y=C1e^2x + C2e^-3 is a solution of the differential equation y''+y'-6y=0

    asked by mari on April 10, 2012
  65. calculus plz help me

    integrate:dx/((x-1)sqrt(x^2-2) plz show solution i plead

    asked by samuel on May 5, 2016
  66. algebra

    find the real solution of the equation by graphing 6x^3-2x=-9x^2 i got 0.2,-1.7 is this correct

    asked by lee on November 26, 2012
  67. math

    A=29 degrees, a= 5, b=13, How many solutions are there for triangle ABC and whats the solution(s)

    asked by lindsey on May 3, 2011
  68. science

    determine the molarity of the following solution 31 g MgF2 in 55ml H20

    asked by willie on January 8, 2013
  69. science

    determine the molarity of the following solution 31 g MgF2 in 55ml H20

    asked by willie on January 8, 2013
  70. Chemistry

    There are 200 mmoles NaOH/400ml. What is the molarity of the solution?

    asked by Jessi on April 21, 2009
  71. Chemistry

    How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca(OH)2?

    asked by Kevin on June 20, 2016
  72. Calculus

    Find the particular solution (solved for y) for the differential equation dy/dx=2x/e^(2y) satisfying y(0)=1.

    asked by Anonymous on April 9, 2015
  73. Math

    If x = xo and x = x1 are both vector solution of Ax=b, then x1 - xo is in the Null Space of A. True or False?

    asked by Anonymous on September 7, 2012
  74. math

    tell whether the point (9,3) is a solution of the inequality 4x-5y

    asked by maya on April 22, 2009
  75. Biology

    How many grams of NaCl do you need to make 150ml of a 0.8M stock solution?

    asked by Keirra on September 8, 2012
  76. organic bio chemistry

    how many mL of a 0.20M KOH solution is needed to neutralize 25 mL of 0.25 M H2SO4?

    asked by lisa on March 8, 2011
  77. Chemistry

    What is the pH of a solution with [OH-] = 2.5 x 10-3? I don't even know where to begin with this problem :( You know [OH] + [H+] = 1*10^-14 so solve for [H+], then pH= -log [H+]

    asked by KHNJ on February 14, 2007
  78. Chemistry

    How many grams of NaCL are required to make 250ml of a 0.4M solution?

    asked by Jessi on April 21, 2009
  79. calculus

    find the general solution x^2-2(e^y)dy/dx = y^3+e(x^2) i am getting the y^3 dx when i do seperation of variables how do i deal with this.

    asked by brad on December 16, 2009
  80. chemistry

    what is the mass of CuS04 needed to prepare a 125ml solution of 3.5M?

    asked by kjkajkjujo on March 7, 2011
  81. Chemisty

    how many mole of calcium sulfate are in a 100mL of .86M solution?

    asked by Riley on November 26, 2012
  82. microeconomics

    consider total cost and total revenue given in the table bellow: quantity total cost total revenue 0 $8 0 1 $9 8 2 $10 16 3 $11 24 4 $13 32 5 $19 40 6 $27 48 7 $37 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

    asked by sara on January 26, 2009
  83. Science.

    Assume a typical hummingbird has a lifespan of 4.0 years and an average heart rate of 1300 beats per minute. (a) Calculate the number of times a hummingbird's heart beats in its life, and express it in scientific notation. Use 365.24 days per year. (b) A

    asked by Jeremy on August 21, 2012
  84. Economics

    6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

    asked by SMsm on June 7, 2008
  85. Economics

    . Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

    asked by SMsm on June 7, 2008
  86. Economics

    6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

    asked by SMsm on June 7, 2008
  87. I need HELP bad! Macroeconomics!

    1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal

    asked by Sarah on May 20, 2008
  88. Macroeconomics

    1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal

    asked by Sarah on May 20, 2008
  89. Chemistry

    (1)Aluminum reacts with oxygen to produce aluminum oxide according to the following reaction: 4Al(s) + 3O2(g) → 2Al2O3(s) Calculate the moles of Al2O3 produced when the reaction is performed with 31.06 g of each reactant. (2)Nitrogen dioxide reacts with

    asked by WCU cats on March 6, 2013
  90. Chemistry [back-titration] - please check my sol'n

    A 7.00 gram sample containing the mineral tellurite was dissolved then treated with 70.0 mL of 0.03114 M K2CrO7. 3 TeO2 + Cr2O7 ^2- + 8 H+ -> 3 H2TeO4 + 2 Cr3+ + H2O When reaction is complete, the excess Cr2O7 2- required a 14.05 mL back titration with

    asked by Nina on March 19, 2014
  91. Chemistry

    A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of the laboratory that measure 15.2 m long, 6.6 m wide and 2.4 m high. a) (1 mark) Calculate the volume of the room in m3 and L. b) (2 marks) If the vapour pressure of

    asked by Anonymous on December 13, 2017
  92. Physics

    A beam has a mass M and length L. A point mass m is located in distance d from the end of the beam and the point mass and the beam lies on the same line.a)Calculate the gravitational force of the beam on the point mass.b)Calculate the gravitational force

    asked by Amber on November 11, 2011
  93. chem

    What is the pH of the solution created by combining 2.40 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? I understand how to find the pH for the NaOH + HCl solution. However, I'm not sure how to find it

    asked by Anonymous on May 2, 2011
  94. physics

    A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.25 s after liftoff, the rocket clears the top of its launch platform, 69 m above the ground. After an additional 4.80 s , it is 1.00 km above the ground. Calculate the

    asked by aisha on March 5, 2012
  95. Chem (general)

    Little confused on how to get part B. A) if 3.00g of hydrosulfuric acid is reacted with 3.00g of silver nitrate, calculate the mass (in g) of solid silver sulfide formed. Which is the limiting reactant? (Hint: the other product is nitric acid). B)

    asked by Sam on October 1, 2014
  96. Probability

    Let X be a continuous random variable. We know that it takes values between 0 and 3 , but we do not know its distribution or its mean and variance. We are interested in estimating the mean of X, which we denote by h . We will use as a conservative value

    asked by qwerty on April 21, 2014
  97. chemistry

    I have this long online lab that I am working on and I am stuck on converting Molarity then ultimately finding the % of phosphoric acid in the cola? There is all of different steps I went through with information but I am going to try to give only the info

    asked by Gweedo8 on July 3, 2009
  98. Physics

    I have 3 different questions. 1) Calculate the coefficient of kinetic friction if it takes a force of 64 Newtons to keep a 54 kilogram box of books sliding across any icy surface at a uniform speed. 2) A car weighing 14,000 Newtons rests on a 20.0 degree

    asked by Dorothy on October 6, 2010
  99. Chemistry

    Deriving Chem Beer's Law's Equation By comparing the absorbance of each trial solution, Aeq, to the absorbance of the standard solution, Astd, [FeNCS2+]eq can be determined. Two Beer’s Law equations can be written, one for the trial (Aeq =

    asked by Raskin on April 19, 2012
  100. physic

    Can somebody shows me step by step with numbers on how to calculate the period for this question-equation. A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a

    asked by joy on February 23, 2018

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