1. chemistry

    You are given a 500 mL stock solution of 10%CaCl2 and are askes to prepare a 50 mL solution of .5% CaCl2. How would you prepare it? Please show work

    asked by morgan on February 6, 2017
  2. chemistry

    starting with a 30% (W/W) SOLUTION OF HYDROGEN PEROXIDE, how many mL would you need to dilute on order to end up with 25.00ml of a 3.6M hydrogen peroxide solution?

    asked by sue on November 5, 2012
  3. AP Bio (but its a question about chemistry)

    no idea how to do this... describe how you would prepare from the specified stock solution: 400 mL of 0.45 M urea starting with a 6 M urea stock solution

    asked by katie on July 24, 2011
  4. Algebra 2

    How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution? Please Show All Work!

    asked by Trisan on October 18, 2009
  5. chemistry

    Find the volume of a 2.5 M solution of sulfuric acid required to prepare 300.0 mL of 0.1 N solution of sulfuric acid

    asked by Cole on October 7, 2015
  6. Chemistry

    Describe, in detail, how to make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution.

    asked by Kristen on February 22, 2011
  7. Chemistry

    A solution of 0.2M nitric acid is to be prepared from a 4.5M solution. How much nitric acid needs to be diluted in a50ml volumetric flask?

    asked by Gunnary on May 12, 2019
  8. algebra

    Use the discriminant to determine the following equations have that are two different rational solutions:two different irrational solutions or exactly one rational solution or two different imaginary solution. x^2=5x+6

    asked by mema on June 9, 2011
  9. Algebra Quadratic Equations

    When a quadratic equation has one solution, there will be one x-intercept; when there are two solutions, there will be two x-intercepts and when the equation has no solution, the graph will have no x-intercepts",is there another way of determining this?

    asked by Marysvoice on February 13, 2008
  10. Math

    Solve triangle ABC if b = 10, c = 9.1, and C = 53.6 degrees. How many solutions are there? First Solution:What are angle A and B and Side a. Second Solution: What are angle A and B and Side a. Thanks!

    asked by Rosetano on February 24, 2012
  11. Chemistry

    I am translating the sentence "HF can be added to calcium carbonate to produce aqueous calcium fluoride carbon dioxide (CO2) and liquid water" into a chemical equation. I'm not sure how you write out Calcium Carbonate symbolically, or how you write clacium

    asked by Gwen on April 2, 2009
  12. CHEM

    A concentrated weak acid is best described as which of the following? (a) a solution with a high pH (b) a solution where the concentration of undissociated acid particles is high and relative quantity of hydronium ions is low (c) a solution where the

    asked by Lena on July 24, 2009
  13. chemistry

    1 L FLASK CONTAINS NITROGEN ALONG WITH A DROP OR TWO OF WATER AT 40C THE TOTAL PRESSURE BEING 760 TORR .IF ALL THE CONTENTS ARE TRANSFERRED TO ANOTHER FLASK OF 0.5L AT THE SAME TEMPERATURE WHAT WILL BE THE PRESSURE SET UP IN THE SECOND FLASK? (AQUEOUS

    asked by Anonymous on September 30, 2010
  14. chemistry

    Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?

    asked by j on October 4, 2010
  15. chemistry

    1 L FLASK CONTAINS NITROGEN ALONG WITH A DROP OR TWO OF WATER AT 40C THE TOTAL PRESSURE BEING 760 TORR .IF ALL THE CONTENTS ARE TRANSFERRED TO ANOTHER FLASK OF 0.5L AT THE SAME TEMPERATURE WHAT WILL BE THE PRESSURE SET UP IN THE SECOND FLASK? (AQUEOUS

    asked by Anonymous on September 30, 2010
  16. physics

    An object(A) of mass 0.2kg strikes a second object (B) of mass 0.35kg that is initially at rest. Mass A has an initial velocity of +3m/s. A) Assume that the collision is entirely inelastic. calculate the final state for these objects. calculate the total

    asked by issak on July 19, 2011
  17. Chemistry

    Balance Eq.: Na2Co3+ CaCl2--> CaCo3+ 2NaCl. (CHALK) Calculate the mass of a dry precipitate. Calculate the mass of moles of the precipitate produced in the reaction.

    asked by Monte; on October 28, 2007
  18. phy

    a 25 kg rod has a box hanging from it and is suspended from the ceiling by the string. The entire system isin equilibrium. Calculate the tesnion in the string and calculate the mass of the box

    asked by ami on October 24, 2010
  19. physics

    The minute hand of a large clock is 0.50 m long. (A) Calculate its linear speed at its tip in meters per second. (0.000873 m/s) (B) Calculate the centripetal acceleration of the tip of the hand. (1.52 x 10-6 m/s2)

    asked by Steffine on January 7, 2014
  20. Chemistry

    Using the bond entalpies ∆H: C---C: 348kJ C=C: 612 kJ C—C (triple bond) : 960 kJ C---H: 412 kJ H---H: 436 kJ Calculate the calculate the value of ∆H of reaction for H2C=CH2(g) + H2(g) → CH3—CH3(g)

    asked by Anonymous on February 17, 2009
  21. calculus

    The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. ( a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area.

    asked by shah on May 27, 2012
  22. Gr 12 math

    I need to calculate the volume of a parallelepiped using the scalar triple product. I can do this if i have vectors. however instead we've been given 8 points which mark the corners. HELPPP this is the question: Calculate the volume of the parallelepiped

    asked by Teniel on September 6, 2008
  23. Physics: Kinematics

    A drag racer can travel a displacement of 120m in 5.00s starting from rest. Calculate the acceleration of the drag racer. Can you calculate the final momentum of the car?

    asked by Blnde on October 16, 2018
  24. Business Statistic

    X f(x) 0 .25 1 .20 2 .15 3 .30 4 .10 Is it prpbsbility distribution valid? Explain and list the requirement for a valid probability distribution Calculate the expected value x Calulate the variance of x calculate the standard deviation of x

    asked by Laverne on October 16, 2010
  25. Chemistry

    Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.

    asked by Mary on September 23, 2010
  26. Chemistry/Normal Distributions/Math

    I'm confused on how to calculate the standard deviation for this... The 95% confidence limit for calcium in control sera is reported as 9.2-10.2 mg/dl. Calculate the value for one standard deviation and the coefficient of variation for this data.

    asked by Maranda on January 21, 2013
  27. Physics

    A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at c.Calculate acceleration at

    asked by Supansa on February 20, 2016
  28. calculus

    The area enclosed between the x-axis, the curve y=x(2-x) and the ordinates x=1 and x=2 is rotated through 2π radians about x-axis. ( a)Calculate the volume of the solid revolution formed. (b)Calculate the rotating area.

    asked by fifi on May 27, 2012
  29. Physics

    A particle moves in three dimensional space as an equation r= (t^2+1.34t)i^+(3.34t-2)j^+(2t^3-4t^2)k^ where is in unit of meter and in second. a.Sketch the path of this particle b.Calculate velocity at t=2 s c.Calculate acceleration at t=2 s

    asked by Supansa on February 21, 2016
  30. mechanics

    A ball of mass 0.75kg moving horizontally at 5m/s strikes a vertical wall and rebounds with a speed of 2m/s.find (a)what is the impulse received by the ball?(b)calculate the coefficient of restitution(c)calculate the kinetic energy of the ball before and

    asked by Anonymous on April 1, 2017
  31. Physics

    1000cm3(cude) of air at 20C and 101.35kpa is heated at constant pressure until its volume doubles. (A) use the ideal gas equation to calculate the final temprature of the gas? (B) calculate the work done by the gas as it expands.

    asked by Anonymous on October 25, 2018
  32. mechanics

    A ball of mass 0.75kg moving horizontally at 5m/s strikes a vertical wall and rebounds with a speed of 2m/s.find (a)what is the impulse received by the ball?(b)calculate the coefficient of restitution(c)calculate the kinetic energy of the ball before and

    asked by Anonymous on April 1, 2017
  33. Science(applied physics)

    At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.

    asked by Bessy on February 17, 2013
  34. Math.stat help :(

    Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test statistic and

    asked by Williams on November 30, 2013
  35. chemistry

    How many moles are in 13grams of C6H6. should this question be broken down into its imperical formula (CH)6 and calculate the number of moles of CH and multiply by 6 or calculate the gram molecular wt of C6H6 and divide it into 13 grams?

    asked by richard on January 23, 2010
  36. Geometry

    Assume each side of the hexagon is worth 10 units. Calculate the apothem, using the fact that it is part of a special triangle to get the answer exactly. Then use the exact value of the apothem to calculate the area of the hexagon.

    asked by Brie on January 14, 2013
  37. math

    Consider the following hypothesis statement using alpha = .05, and data from two independent samples: Ho: µ1 - µ2 = 0 Ha: µ1 - µ2 not equal to 0 X1 = 237, X2 = 218 ¬1 = 54, ¬2 = 63 n1 = 42, n2 = 35 a) Calculate the appropriate test statistic and

    asked by Lea on November 29, 2013
  38. Chemistry

    a)Calculate the lattice constant a in palladium (Pd).express your answer in angstroms. b) Calculate the distance (in angstroms) between adjacent (110) planes in palladium (Pd). Hint: use your work from part (a).

    asked by selly on November 22, 2012
  39. chemistry

    Calculate the energy needed to produce 10 moles of Cl2O7 using this balanced equation. 2Cl +70+ 100kCal==2ClO7 please explain steps if I needed to calculate for 7 moles, how would it change?

    asked by lulu on April 16, 2016
  40. Science(applied physics)

    At time t=0,a 1kg ball is thrown up from the top of a tall tower with velocity Vo=18i+24j(m/s). a:calculate the components of th velocity at t=6s. b:Calculate the kinetic energy of the ball at t=6s.

    asked by Bessy on February 17, 2013
  41. CHEMISTRY- answer check

    A 0.386g sample of a protein was dissolved in water and made up to a volume of 60mL at 21.0°C. At this temperature the osmotic pressure of this solution was 1.24mmHg. Calculate the molecular mass of the protein 12682 g mol-1 95025 g mol-1 9627613 g mol-1

    asked by lulu on October 9, 2010
  42. Chem Help :(

    What is the pH of a solution in which [H3O^+] = 6.8 x 10^-5 M? What is the pH of a solution in which [OH^-] = 2.5 x 10^-9 M?

    asked by Tom on February 17, 2014
  43. Mathematics

    Am I right?? |a| -3/4 = -5/8 A) 1/8 or -1/8 B) 7/8 or -7/8 C) 1 3/8 or -1 3/8 D) No Solution** Wouldn't this just come out to to no solution..??

    asked by Logan82 on October 17, 2017
  44. math

    x=9 is a solution of the inequality x-3 is less than 7 but x= 10 is not a solution

    asked by Anonymous on December 10, 2009
  45. Math

    What are the solution of the system? y=x^2+3x-4 y=3x+2 A (-3,6) and (2,-4) B(-3,-4) and (2,6) C (-3,-4) and (-2,-2) D no solution I think it is D

    asked by Pal on May 22, 2018
  46. 10th grade

    scientist needs 5L of 12% solution. She has on 10% and 17% solution. How much of each does

    asked by darren on October 1, 2010
  47. Algebra

    What is the solution to 5q=-75? A. q=-25 B. q=-15 C. q=15 D. q=25 what is the solution to r/-3=12? A. r=-36 B. r=-4 C. r=4 D. r=36 Is the answers A and D?

    asked by Darius on September 28, 2016
  48. physics

    What is a solution? What are the 2 parts of a solution

    asked by keria on January 20, 2012
  49. Math

    3.) What is the solution to -33+m=10? 4.) what is the inverse to 38 5.) What is the solution to y+7=-9

    asked by Caylee on September 21, 2015
  50. intermediate algebra

    1.(5,1)is a solution to the equation2x-3y=7.what does this mean? 2.(-3,_)ia solution of =4-3x

    asked by keke on February 20, 2010
  51. algebra

    what is the solution for 3x=27-15x and what is the solution for 7(2-m)=3m

    asked by Cristine on September 29, 2009
  52. important math question

    the equation x^3 -x-5=0 has one solution for x between -2 and 2. what is the solution? how do I get this

    asked by sara on August 17, 2014
  53. science

    How many ml of a 2% solution will 20 ml of a 10% solution make?

    asked by jenny on September 11, 2012
  54. algebra

    continued 4c=3d+3 c=d-1 i got (6,7) x=1/2y+3 2x-y=6 i got no solution 8x+2y=13 4x+y=11 i got no solution 2x-y=-4 -3x+y=-9 i got (13,30) 3x-5y=11 x-3y=1 i got (7,2)

    asked by Chris on November 18, 2008
  55. Algebra

    Match ABCDE with the solution set below A. {4/3, -4} B. {x|x > 4 or x < -4/5} C. No Solution D. {x| -11 < x < -7} E. All Real Numbers Solution set ABCDE|x + 9| < 2 ABCDE|5x - 8| > 12 ABCDE|3k + 4| = 8 ABCDE|x - 6| = -10 ABCDE|6x + 8| > -4

    asked by Nick K. on June 7, 2009
  56. chemistry

    Flask A contains 100 milliliters of a solution with a pH of 5. After you add 100 milliliters of a solution from Flask B, the pH rises to 7. What was the pH of the solution in Flask B?

    asked by Katy on September 5, 2014
  57. AP Chemistry

    A sample of potassium nitrate (49g) is dissolved in 101g of water at 100°C, with precautions taken to avoid evaporation of any water. The solution is cooled to 30°C and no precipitate is observed. The solution is ________. A. Hydrated B. Supersaturated

    asked by Anonymous on November 15, 2009
  58. Chemistry

    Please help me answer this question; The goal of the recrystallization procedure is to obtain purified material with a maximized recovery. For each of the following, explain why this goal would be adversely affected. a) In the solution step, an

    asked by Judy on February 8, 2010
  59. Veterinary Medicine Math calculations

    I was so thankful to see this exact question answered in a different way but I still don't understand how I'm suppose to know how or what to do on the following question. I just seem to always forget something. Fifty milliliters of a solution of 50%

    asked by Selina on February 6, 2017
  60. Physics

    8. In an ultracentrifuge a solution is rotated with an angular speed of 3000 rev/sec at a radius of 10 cm. How large is the centripetal acceleration of each particle in the solution? Compare the centripetal force needed to hold a particle of mass 10-5 gm

    asked by Pakilina on November 28, 2011
  61. chemistry

    three student chemists measured 50.0 mL of 1.00 M NaOH in separate Styrofoam "coffee cup" calorimeters ( Part B). Brett added 50.0 mL of 1.10 M HCI to his solution of NaOH; Dale added 45.5 mL of 1.10 m HCL 9 eqaul moles) to his NaOH solution. Lyndsay added

    asked by Daniel on January 17, 2011
  62. physics

    While sitting on a frozen pond, a 35kg child throws a 0.5kg ball horizontally at a velocity of +6m/s. Calculate the resulting velocity of the child across the ice.Suppose the child throws the ball upward instead, at a 25o angle above horizontal. a)

    asked by taryn on October 2, 2012
  63. Biology

    Which solute out of protein, urea, glucose, chloride, ammonia, "substance x" cannot be filtered into the nephron? Why? I know that urea, protein, and chloride ions can be filtered. I don't know about glucose, ammonia or substance x.

    asked by Anonymous on October 14, 2007
  64. Physics

    2. A pool has an area A = 50 m2 and depth h = 2.5 m. The pool is filled with water to the maximum height. An electrical pump is used to empty the pool. There are two pipes coming out the pump: one is submerged into water has a radius r1 = 4 cm the other

    asked by Sean on April 13, 2012
  65. Chemistry

    Can you check if this is correct please? a) How many moles of sodium hydroxide are there in 19.00 cm3 of 0.100 mol dm3? My answer: 0.0019 mol b) How many moles of hydrochloric acid are, there in 25.00 cm3 of the acid solution? My answer: 0.0019 mol c) How

    asked by Franky on October 16, 2011
  66. chemistry

    Problem 3 A publication this year in the journal Yeast (who’d have thought!) by a Scottish group described their development of a spectrometric procedure to monitor the concentration of glucose, ethanol, biomass, and protein content in a vat during the

    asked by asery on May 5, 2016
  67. Maths

    Chris wants to put a concrete path and a fence around his rectangular garden. The concrete path will be 1 meter wide and the fence will go around the edge of the path. The garden itself measures 5 meters by 8 meters. A)Calculate the perimeter of the fence.

    asked by Anonymous on February 24, 2011
  68. biology

    The micelle and the liposome are two structures formed by phospholipids in an aqueous environment. They are represented here in cross section. The letters A, B, C, and D represent different regions. Four different molecules are shown below. For each,

    asked by selly on March 13, 2013
  69. Physics

    A sphere of radius 10 cm is charged to a potential of 500V. Calculate the outward pull per unit area. Ans: 1390 * 10^-8 N/m^2 -------- I'm sure the calc is simple, but how do I calculate "outward pull" from voltage?

    asked by Sean on December 24, 2009
  70. Physics

    A) Calculate the kinetic energy of a 5.0g bullet travelling with a velocity of 400^ms-1. B) Calculate the gravitational potential energy relative to the ground when a bird of mass 105g is 400m above the ground.

    asked by Syafiqa on July 17, 2010
  71. Chemistry

    (A) calculate the density of NO2 gas at 0.970atm and 35 Celsius. (B) calculate the molar mass of a gas if 2.50g occupies 0.875L at 685torr and 35 Celsius. Answers are 1.77g/L 80.1g/mol

    asked by Kate on January 20, 2018
  72. chemistry

    28cm3 of 0.2mol of sodium hydroxide was titrated against 25cm3 of hydrochloric acid using methyl orange as indicator, calculate the concentration in mol/dm3,calculate the concentration in g/dm3

    asked by rukayya on September 19, 2017
  73. math help

    Let u = [2,−3, 1] and v = [0, 1, 4]. Calculate the vector u − v. Place u and v tail-totail to form two sides of a triangle. With regard to this triangle, what does u−v represent? Calculate the number u•u and discuss its relevance to the diagram you

    asked by jillian on April 15, 2010
  74. Chemistry

    For a chemistry lab, I have to calculate the heat of combustion of paraffin wax. So how would I do that? And for the second part of the lab, I have to calculate the heat of fusion of ice from my data. How would I do that? I'm kind of confused so can I get

    asked by Anonymous on September 9, 2017
  75. chemistry

    A titration to standardize a HCl solution was performed by taking 50.0ml hydrochloric acid in a flask with a few drops of phenolphthalein indicator. The burette was filled with 0.15 molar NaOH. The initial reading of the burette was 0.50ml and the final

    asked by martha on March 14, 2017
  76. General Chemistry.

    The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.765 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll

    asked by Shardae. on November 7, 2012
  77. Chemistry!HELP

    32.12mL of 10.0 mol/l potassium chromate solution is reacted with 120.0m of 2.00mol/l lead (II) nitrate solution. The balanced equation is; 2KCrO4(aq)+Pb(NO3)2(aq)==>2KNO3(aq)+Pb(CrO4)2(s) a. Determine the limiting reactant b. What is the maximum mass, in

    asked by Lee L on November 20, 2017
  78. SCIENCE

    ALuminum can be determined gravimetricaly by the reaction with solution of 8-hydroxyquinoline (C9H7NO3).The net ionic equation . A mass of 0.1248g of Al(C9H6NO)3 WAS obtained by precipitating all of the the Al3+ from a solution prepared by dissolving

    asked by NELLY on January 15, 2015
  79. Analytic chemistry

    A solution of HClO4 was standardized by dissolving 0.3745 g of primary standard grade HgO in a solution of KBr. The liberated OH- required 37.99 mL of the acid to be neutralized. Find the molarity(M) of HClO4. The given balanced chemical equation is: HgO +

    asked by Smile on January 21, 2015
  80. Chemistry

    KClO3 decomposes in the presence of MnO2 to form oxygen gas, collected over H2O at 23.0 degrees C and a barometric pressure of 754.2 torr, as described in the experimental description. After the pressure of the oxygen gas is equalized with atmospheric

    asked by Anonymous on July 9, 2008
  81. Physics

    calculate the electric potential at a point P, a distance of 1m from either two charges of +10uC and -5uC which are 10cm apart. Calculate also the potential energy of a +2uC charge placed at a point,P

    asked by Evans on September 3, 2018
  82. chemistry

    1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t

    asked by ama on July 18, 2012
  83. math

    Class ring:$89 Group discount:17% Sales tax:5% make sure to calculate the discount price first and then calculate the tax round to the nearest penny

    asked by Taylor on October 17, 2013
  84. College Physics

    Calculate the voltage required to accelerate a beam of protons initially at rest if they have a kinetic energy of 2.7 eV. deltaV = V Calculate their speed if they have a kinetic energy of 2.7 eV . v = m/s

    asked by Lanise on January 31, 2010
  85. Chemistry

    A solution of 100.00mL of 0.2000mol/L sodium carbonate and 200.00mL of 0.1000mol/L calcium nitrate solutions are mixed together according to the reaction: sodium carbonate + calcium nitrate→ calcium carbonate + sodium nitrate. how would you calculate the

    asked by Walker on August 20, 2012
  86. science

    Acetic acid (CH_3COOH) is a weak acid. a) Write the symbolic equation showing the ionisation of acetic acid. b)Given that an acetic acid solution of pH 4.8 has a hydrogen ion concentration of 1.58 * 10^-5 mol L^-1, what is the concentration of the acetate

    asked by anonymous on January 19, 2018
  87. Chemistry

    How would you start and finish these questions by a step by step process? Does Amp equal to Joules? 1. How many grams of aluminum can be produced by the electrolysis of aqueous aluminum chloride by a current of 5.00 amps for 5.00 hours? 2. Consider the

    asked by Erika on April 6, 2014
  88. math

    You have an aquarium for your new pet, “Shamu” the killer whale, that contains 100,000 pounds of ocean water with a salinity of 30 o/oo. a. Calculate how many pounds of salt are currently in the aquarium. b. You think Shamu may be allergic to salt, so

    asked by amanda on August 21, 2012
  89. College Chemistry 104

    Students are attempting to construct a battery in the laboratory that will light up a light bulb. Compare the following lists prepared by students and determine which student will not be able to successfully build a "battery" that will light up the bulb.

    asked by Claire on May 10, 2013
  90. chemistry

    the mass number is used to calculate the number of-----------in one atom of an element. in order to calculate the number of neutrons you must subtract the ------from the-----------

    asked by jennifer on October 7, 2008
  91. Chemisty

    A 5 μL drop of compound X, a 7 μL drop of compound Y, and a 15 μL of compound Z are placed in a closed container with 5 mL water and 2.5 mL air. The system is equilibrated at 25°C. Determine the fraction of the total X, Y, and Z mass associated with

    asked by Anonymous on September 2, 2014
  92. Chemistry

    Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

    asked by Alexander on February 19, 2017
  93. Chemistry

    Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

    asked by Anonymous on February 19, 2017
  94. chem 100

    Super confusing question im not sure how to approach a. Determine the concentration of lead ion in solution (the molar solubility) if PbI2(s) is in equilibrium with water. Ksp = 9.8*10-9 b. From part a, it should be clear that if Pb2+(aq) and I-(aq) are

    asked by Mall on May 21, 2015
  95. chemistry

    A solution contains an unknown amount of dissolved magnesium. Addition of 5.34×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in the solution.

    asked by bob on September 30, 2014
  96. Chemistry

    A solution contains an unknown amount of dissolved magnesium. Addition of 3.38×10−2mol of Na2CO3 causes complete precipitation of all of the magnesium. What mass of magnesium was dissolved in this solution?

    asked by Courtney on October 3, 2013
  97. Pre-algebra

    Hi need help answering this question? In your own words, define the term equation and then explain what it means to solve an equation. Give an example of an equation and its solution. Explain why it is the solution.

    asked by clarissa on May 21, 2011
  98. chemistry

    you dissolve x in 175g of water to make a saturated solution at 50 degrees celcius. if the solution is cooled to 10 degrees celcius, how many grams of x settle out? (x=15.0 at 50 degrees)

    asked by steve on October 13, 2010
  99. college algebra

    Find all real solutions of the equation. (Enter your answers as a comma-separated list. If there is no real solution, enter NO REAL SOLUTION.) x4 + 27x = 0

    asked by tara on September 5, 2013
  100. chemistry

    When 7.50 grams of iodine (I2) is added to 48.7 grams of carbon tetrachloride (CCl4), the iodine dissolves and a solution is formed. The weight percent of the iodine in the solution is a) 13.3 % b) 15.6 % c) 60.7 % d) 2.96 % e) 86.0%

    asked by jimmy on February 3, 2012

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