1. chemistry

    How many grams of Ca(OH)2 can be dissolved in 550mL of a .0500 M NaOH solution. Ksp - Ca(OH)2 is 5.5 x 10-5

    asked by lisa on October 27, 2015
  2. Biology

    Describe how you would prepare 100ml of a solution that is 22% acetic acid by volume?

    asked by Michel on January 24, 2016
  3. math

    Determine the exact solution algebraically. a) 2^x= 2^7. can someone plz answer this for me, thanks a lot

    asked by gagan on July 2, 2009
  4. Chemistry

    Calculate the H+ ion concentration if 0.20M NH3 solution is 2.5% ionized.

    asked by charley on September 12, 2012
  5. CHEMISTRY

    What is the molarity of 250 mL of a solution that contains 12.5 g of dissolved zinc bromide, ZnBr2?

    asked by Jessica on July 8, 2010
  6. chemistry

    Calculate [H3O ], [ClO4–], and [OH–] in an aqueous solution that is 0.130 M in HClO4(aq) at 25 °C.

    asked by Sevy on October 20, 2011
  7. Math

    Choose the graph that shows the solution of the inequality on the number line. c < -1 please help!!!

    asked by LOLI on May 21, 2018
  8. chemistry

    What is the symbol equation of iron nails with copper sulfate solution.

    asked by derik on March 29, 2017
  9. Algebra

    Write the solution to the inequality in set builder notation. 9t - 4 > 32 My answer is (t I t > 4)

    asked by Faye on September 16, 2014
  10. chemistry

    For each of the following explain how you would prepare 1.0 L of a solution that is 0.10 M in K+. Repeat for concentrations of 1.0 × 102 ppm K+ and 1.0% w/v K+.

    asked by Anonymous on September 12, 2012
  11. chemistry

    how many milliliters of concentrated NaOH(19.3 M) are needed to make 8.00 L of 0.25 M base solution?

    asked by HElp on October 20, 2011
  12. chemistry

    what is the pH of a solution prepared by adding 0.65mol of LiOH(aq) to 1.0L of 0.30mol/L HNO3(aq)>

    asked by bryant on October 3, 2016
  13. Chemistry

    in Synthesis of para-Methylacetanilide What was the purpose of the sodium acetate solution

    asked by Mandy on November 27, 2010
  14. maths

    1.)The complete solution set of √x-2 < 2 is ? 2.)The area of the region bounded by √x^2 + √y^2= 1 is ½ sq. units

    asked by srikar reddy on April 23, 2014
  15. Chem 1A

    Help please! How many moles of NaOH must be added to 1.0 L of 3.0 M HC2H3O2 to produce a solution buffered at each pH? 1) pH= 3.78 2) PH= 6.52

    asked by Mackenzie on March 15, 2012
  16. Chemistry

    Describe how you could make approximately 5 g of a 3% (w/w) ferrous ammonium sulfate solution

    asked by Wanda on November 8, 2011
  17. chemistry

    How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate?

    asked by FB1907 on June 30, 2012
  18. Chemistry

    How could 2 molecular compounds react to create a precipitate and an aqueous solution?

    asked by Serena on November 17, 2013
  19. Algebra II

    What's the solution for -5 < 1 - 2k < 3? Is it 3 > k >-1 or is it -1 < k < 3? I'm not sure if you have to switch the order of the numbers also when you're dividing it by a negative number..

    asked by anna on September 15, 2010
  20. Chemisty

    How much KNO3 will you have to add to 100 g of water at 40° C to make a saturated solution?

    asked by Hannah on August 1, 2011
  21. chem

    how many ml of a.15M NaOH solution are required to neutralize 35.00 ml of 0.22M Hcl

    asked by dodo on November 8, 2011
  22. Chemistry

    How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF MgF2 + H2

    asked by Ashley on June 9, 2011
  23. Chemistry

    How many grams ofPbCl2will dissolve in 2.00 L of O.650M aqueous Pb(N03)2 solution?

    asked by Anonymous on December 15, 2012
  24. pre algebra

    what is the solution to -√90 to the nearest integer? A: 3 B: -5 C: 7 D: -9 i did the rest of the problems (5) but idk how to do this one at all.. pls help

    asked by anon on November 27, 2018
  25. chem

    calculate the concentration of all ions present in 58.7 mg NH4Br in 500 mL of solution

    asked by celine on April 11, 2013
  26. chemistry

    i need help to do this and to write this out. 2.0 L of a 6.0 M HCl solution is added to water so that the final volume of 6.0 L.

    asked by ashlyn on April 23, 2019
  27. chem

    what is the molarity of iodine ions in a 100 mL solution containing 2.50g of MgI2?

    asked by tracy on April 24, 2011
  28. Chem 2

    What mass of water must be used to make a 1.35m solution that contains 8.20 moles NaOH?

    asked by Cassidy on December 17, 2012
  29. chemistry

    A strong acid solution with H+=4 is diluted to twice its original volume. Will the pH go up, down, or stay the same?

    asked by Anonymous on April 25, 2010
  30. chemistry

     Which 0.10M solution below has the lowest pH? a) NaCl          b) KCN          c) LiF          d)  RbClO     e)  all have the same pH​

    asked by Anonymous on March 26, 2013
  31. Chemistry

    Calculate the boiling temperature of a 0.50 M solution of sucrose. Assume that the concentration is 0.50 m.

    asked by Caleb on April 18, 2016
  32. Logarithms

    help- e^1-5x=3 find solution to 4 decimal places. I don't know how to type it in to my calculator!

    asked by jennifer on February 5, 2013
  33. chemistry

    A 0.97 m aqueous solution of an ionic compound with the formula MX has a freezing point of -2.5 ∘C .

    asked by Brittney on January 30, 2015
  34. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  35. chemistry

    why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate

    asked by ama on July 18, 2012
  36. science

    describe briefly how you would prepare a 0.2M solution of KOH in 250cm flask

    asked by venus on May 11, 2017
  37. chem

    A solution is prepared with 50.0 g of HNO3 and 130.0 g of H2O. It has a density of 1.21 g/mL. What is its molarity (M)?

    asked by Michelle on November 29, 2010
  38. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  39. chemistry

    what is the molar solubility of Fe(OH)3 in a buffered solution with pH=8.2 at 25 degrees Celsius given ksp =4.0*10^-38.

    asked by cliff on December 4, 2015
  40. Chemistry

    2.00 L of 0.800 M NaNO3 must be prepareds from a solution which 1.50 M in concentration. How many mL of the 1.50 M are required ? I am not sure weather " 2.00 L " is my V1 or V2 .

    asked by Jessica on April 3, 2013
  41. chemistry

    How many grams of solid KOH are needed to prepare 100.mL of a 1.7 M solution?

    asked by Kelli on February 21, 2011
  42. Chemistry

    What volume (in L) of a 2.10 M NaOH solution is required to neutralize 0.30 mol of HCl?

    asked by JaKwante on November 21, 2018
  43. Calc 2

    Find the solution of the differential equation that satisfies the given initial condition. dy/dx= x/y, y(0) = −7

    asked by TayB on March 29, 2016
  44. Algebra

    41-(2x+4)< or + to 2(x+1)+x Use set-builder notation to describe the complete solution. {x/x__ __}

    asked by Liz on March 15, 2010
  45. gp school

    calculate the molarity of a solution when 5g of urea is dissolved in 600ml of water

    asked by shiksha on August 20, 2011
  46. chem

    How does the osmotic pressure of an aqueous solution change as evaporation occurs?

    asked by Ginger on April 25, 2008
  47. chemistry

    What is the molality of a solution composed of 28.4 g of methanol CH3OH and 250 g of water

    asked by j on February 18, 2014
  48. chemistry

    Explain how to make a 1.5M solution of copper (II) sulfate with a volume of 250 mL.

    asked by valentina on February 6, 2011
  49. Chemistry

    636 grams of Na2CO3(s) are disolved in 3.0 liters of aqueous solution

    asked by Jane on June 14, 2013
  50. Chemistry

    If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?

    asked by J on November 29, 2015
  51. chemistry

    calculate the mass of naso4 needed to prepare of 0.5L of 0.15M of solution

    asked by elissa on November 14, 2012
  52. Math

    If the 4-digit number 4AB2 is divisible by 44, what are the values of A & B? (Solution pls...)

    asked by MNHS_HELP on January 26, 2015
  53. math

    2cos(1/2x)-cos(1/2x)=0 , where 0

    asked by Bobby on March 31, 2017
  54. chemistry

    I have 50mL of0.2M of potassium permanganate solution.What is the Molarity of KMnO4?

    asked by linda on February 5, 2010
  55. Science

    How many grams of sodium bicarbonate (NaHCO3) are needed to make a 0.6M solution?

    asked by Beth on September 14, 2016
  56. biochem

    ph is 4.6, pKa is 4.76 in a .15M buffer solution, what are the concentrations of acid and base?

    asked by Lola on September 17, 2012
  57. chemistry

    how many grams of CaCI would be required to produce a 8.5M (molar) solution with a volume of 2.0L

    asked by Anonymous on April 9, 2015
  58. Chemistry

    How many grams of NaF should be added to 612 ml of 0.4 M HF (Ka = 6.8 x 10-4) to produce a buffer solution where pH = 3.10?

    asked by Ashley on April 12, 2013
  59. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  60. chemistry

    If 5.0 mL of 0.12 mmol dm-3 MB solution is diluted by adding 20.0 mL of 0.2 mol dm-3 HCl to it, what is the new MB concentration?

    asked by Mara on April 26, 2015
  61. Chemistry

    What mass of KH2PO4 is needed to prepare 500.0 mL of a 0.067M solution?

    asked by John on February 9, 2012
  62. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  63. Chemistry

    The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 is a) 3.5 b) 3.0 c) 2.5
 d) 2.2
 e) -3.0 i got C by -log(3.0e-3) is this correct?

    asked by Linda on March 14, 2012
  64. Math Help!

    What is the solution to negative square root 75 to the nearest integer? A. 9 B. 8 C. -8 D. -9 Is the answer C? Thank you

    asked by Laura Ashley on November 3, 2014
  65. chemistry

    Calculate the H+ concentration (M) of a 0.010 M solution of NH4Cl. Note that the Kb for NH3 is 1.8 e-5.

    asked by cs on November 28, 2010
  66. Chemistry

    What is the gram solubility of Mg(OH)2 in a 0.55mol/L solution of KOH if the Ksp of Mg(OH)2 is 9.0x10^-12?

    asked by Brianne on May 14, 2016
  67. algebra

    evaluate and write in the solution in scientific notation 3x10^5\1.5x10^3

    asked by tracy on October 18, 2011
  68. math 101

    what is the solution of n+2>8 when the replacement set for the variable is all one-digit prime numbers?

    asked by Arvee on September 14, 2016
  69. Chem 2

    Describe how to make 175mL of a .10M tin(II) chloride solution??

    asked by Destry on November 27, 2012
  70. Chemistry

    Describe how you would prepare 2.00 L of an aqueous solution having a pH of 3.60 if you had a supply of 0.100 M HCL

    asked by Katlynne on April 10, 2013
  71. chem

    4.25 g. of zinc hypochlorite is dissolved in 215 ml. of water. what is the molarity of the solution

    asked by yosick on April 4, 2013
  72. chemistry

    Air is a gas solution where oxygen is the solvent. True or False

    asked by Anonymous on December 5, 2011
  73. trig

    find the fundamental solution set (FSS) for(cos2θ)(tanθ+1)=0

    asked by AppleM. on March 9, 2010
  74. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  75. algebra

    for which values of a and b does the following pair of linear equation have an infinite number of solution ? 2x+3y=7 (a-b)x+(a+b)y=3a+b-2

    asked by somiya on July 16, 2012
  76. Chemistry

    How many grams of NH4Cl must be added to 250ml of .2M NH4OH in order that the solution shall have a pH of 7.2?

    asked by Johnny on April 20, 2010
  77. Solving inequanities

    Write the solution to the inequanity in set builder notation 9t-4>32 t t>4 t t>6* my answer t t>28 t t>36

    asked by Alex on October 17, 2013
  78. organic biochemistry

    Calculate the number of moles of ZnCl2, in 100. mL of 0.600M solution.

    asked by hannah on November 5, 2014
  79. algebra

    Express your answers as simplifier, improper fraction if necessary [3(a+3)]=29 the solution set is { }

    asked by maribel on January 25, 2015
  80. Chemistry

    Calculate the pH of a solution container 0.20m ch3cooh and 0.30m ch3coona

    asked by Bantar on December 11, 2018
  81. AP Chemistry

    HCN is mixed with water. Which is the best description of what you would expect to find in the solution?

    asked by Kami on October 13, 2010
  82. chem

    what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

    asked by k on November 13, 2012
  83. chem

    How is the number of moles of NaOH affected at the equivalence point of the solution?

    asked by me on October 18, 2009
  84. science

    how much salt must be added to how much water to create 10ml of a 10% saline solution.

    asked by amy on September 14, 2016
  85. chemistry

    How many moles of FeCl3.6H2O are required to make 10.00 mL of 1.50 M stock solution?

    asked by therese on October 10, 2010
  86. Earth Science

    1. What are one internal and one external source of energy in the Earth system? 2. Earth scientists assume that the causes of natural events of phenomena can be discovered through... 3. Science constantly creates new technology. Does this new technology

    asked by Emma on January 13, 2013
  87. Accounting

    During the fiscal period just ended some of the inventory in the warehouse of Jamie Ltd. wasn’t counted. Jamie Ltd. uses a periodic inventory control system. Explain how the following are affected by the error: • Net income • Current ratio

    asked by Callie on February 5, 2014
  88. social studies

    How has the caste system changed in India and Pakistan? A. It faded from existence as societies became less religious. B. Caste-based discrimination has been outlawed. C. Women can now belong to the highest castes.*** D. There are now only three castes

    asked by earth~chan on February 21, 2019
  89. physics

    two crates, of mass 75 kg and 113 kg, are in contact and at rest on a horizontal surface. A 727 N force is exerted on the 75 kg crate. If the coefficient of kinetic friction is 0.15, calculate the following: a)the acceleration of the system b) the force

    asked by Haley on November 22, 2010
  90. history

    Which of the following was true of the Judiciary Act of 1801? A. It packed the Supreme Court with Democratic Republicans. B. It was opposed by the Federalists. C. It expanded the federal court system. D. It reduced the power of the federal courts. I put a

    asked by All on October 23, 2013
  91. Physics

    A weight lifter manages to lift a 147 kg weight a distance of 1.1 m. Treat her as a thermodynamic system and find how much heat (in kcal) she must put out if her internal energy decreases by 3620 J during the lift. Not sure how to answer this.

    asked by Riley on January 31, 2014
  92. geography

    Under the Soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources.

    asked by sarah on June 9, 2016
  93. Social studies

    Why did Horace Mann feel that reforming the American education system was important? A. it would help people attain better jobs B. it would help in the fight to end slavery C. it would help in the fight for gender equality D. it would help people become

    asked by Bruh on November 20, 2017
  94. Ms. Sue

    Ms. Sue Ive done my journal entries for the immigrant experience thing, and theres just one more thing I have to add at the end-- How has the land-granting system encourages speculation? I don't really know what to say--I was thinking of just ending it

    asked by Sara on February 27, 2011
  95. College Physics

    An object is suspended from a spring and vibrates with simple harmonic motion. At an instant when the displacement of the object is equal to one-half the amplitude, what fraction of the total energy of the system is kinetic and what fraction is potential?

    asked by Jen on October 26, 2007
  96. MLA citation

    Which of the following is not a tip that can help you find good sources for a topic? A. Limit yourself to one source in the beginning. B. Have a narrowed topic and working thesis. C. Keep track of citation information for each source. D. Have a clear

    asked by Daniela on July 27, 2015
  97. Geography

    Under the Soviet system the government.. controlled all forms of communication. allowed newspapers to print whatever they wanted. controlled editorials but not the reporting of news. encouraged access to a wide variety of news sources. I think it is either

    asked by Kiri on July 10, 2012
  98. Physics

    An astronaut exploring a distant solar system lands on an unnamed planet with a radius of 3800 km. When the astronaut jumps upward with an initial speed of 4.00 m/s , she rises to a height of 0.600 m. What is the mass of the planet?

    asked by Cooper on November 9, 2011
  99. Physics

    A 155 g aluminum cylinder is removed from a liquid nitrogen bath, where it has been cooled to -196 degrees c. The cylinder is immediately placed in a insulated cup containing 80g of water at 15 degrees c. What is the equilibrium temperature of this system?

    asked by Erin on August 4, 2019
  100. Physics

    3)-A 9-kg block is held by a pulley system shown in fig. What force must the person exert in the following cases: a) to hold the block at rest. b) to lower it at 2m/s. c) to raise it with an acceleration of 0.5 m/s2? Ignore the mass of small pulley.

    asked by Simon on March 21, 2016

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