1. general chem.

    1. Sour pickles have a pH of about 3.00. The [OH –] in a typical sour pickle is 8. A solution of sodium hydroxide was prepared for a chemical analysis using 0.65 g in 500 mL. The hydrogen ion concentration in the solution is Use the information to answer

    asked by !!! on June 18, 2006
  2. chemistry

    A student prepares a 2M solution of copper sulphate. She adds 17 mL of the solution to a 100 mL volumetric flask and dilutes it up to a final volume of 100 mL with water. What is the final molar concentration of the copper sulphate? How many moles of

    asked by flona on November 8, 2010
  3. Chemistry!!!~!!

    A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48°C? The vapor pressure of pure water is 23.8 torr at 25°C and

    asked by Jenn on April 19, 2010
  4. Chemistry

    Calculate the total pressure above 1.0L solution of a 1.42M CH3OH(aq) solution at 25 degrees(C). The vapor pressure of pure methanol at 25 degrees (C) is 127.1 torr and the vapor pressure of the pure water is 23.8 torr at 25 degrees(C. You may assume that

    asked by Kayla on December 6, 2016
  5. Microeconomics

    Long-run average total costs curves are often U-shaped: A: For the same reasons that average total cost curces are often U-shaped. B: Because of constant returns to scales. C: Because of increasing coordination problems at low levels of production and

    asked by Gigi on August 19, 2008
  6. Chemistry Help ????

    Experiment - Recrystallization of a solid Purpose in this experiment acetanilide will be recrystallized from water, which serves as the solvent.. Pre-Lab Questions.... Explain the purpose of the following in this experiment. a) using hot filtration b) not

    asked by SARAH on November 23, 2008
  7. CHEM

    Mass percent is one way to represent solution concentrations, though not the only one. A common measure of solution concentration is Molarity; moles of solute per liter of solution. Calculate the molarity of vinegar in each sample that you titrated and

    asked by Linda on March 18, 2015
  8. Chemistry

    An EDTA solution is standardised against high-purity CaCO3 by dissolving 0.4835 g CaCO3 in HCl, adjusting the pH to 10 with ammoniacal buffer and titrated with an EDTA solution. If 35.18ml were required for the titration, what was the molarity of the EDTA

    asked by Daniel on January 11, 2015
  9. math

    How do you solve system of equations and tell if they're consistant and independant,consistant and dependent,and inconsistant? If you find no solutions then the system is inconsistent. Suppose you have N variables and M equations (N larger than or equal to

    asked by maddie on July 27, 2007
  10. chemistry

    Sleeping pills often contain barbital, which is weakly acidic (pKa = 8.00). For analysis of the barbital content of a sleeping pill, a titration is carried out with strong base. It takes 12.00 mL of 0.200 M base to reach the stoichiometric point. If the

    asked by help on March 26, 2011
  11. science

    the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in

    asked by irsha on September 6, 2011
  12. science

    the teacher instructed three students A,B,and C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in

    asked by chemistry on September 6, 2011
  13. Chemistry

    Use activity coefficients to find the concentration of hydrogen ions in a solution of 75.0 mM butanoic acid and 0.01 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm. What is the concentration

    asked by martini on October 11, 2013
  14. Hudi

    Sovereign each system by substitution.check your answer. 1/ y=x_2 y=4x+1 My answer: x_2=4x+1 2 2 x=4x+3 _4 _4 x= 1 y=x_2 y=_2 Solution:(1,_2) 2/ y=x_4 y=_x+2 My answer: x_4=_x+2 +4 +4 x=_x+6 +x +x x=7 y=x_4 y=7_4 y=3 Solution:(7,3) 3/ 2x+y=8 y=x_7 My

    asked by Nan on September 16, 2018
  15. Chemistry

    A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base indicator phenolphthalein is

    asked by Mary on October 26, 2014
  16. English Lit

    I have a question about Henry II. What did he do that solidified his power as king but led to economic problems and helped incite conflict with the church. The possible answers are: Executed all Bishops who were opposed to his rule Gave enormous finiacial

    asked by Emily on January 29, 2012
  17. Chemistry

    A chemist must prepare 500 ml of 9.00uM aqueous mercury(II) iodide working solution. He'll do this by pouring out some 81.0 umol/L aqueous mercury(II) iodide stock solution into a graduated cylinder and diluting it with distilled water. Calculate the

    asked by Mia on December 20, 2018
  18. Chemistry

    You have 100 mL of a 0.450 M sulfuric acid solution, but you now need to add NaOH to make the solution basic. How much NaOH ( in grams) will you need to add to make the solution have a pH of 13.0? The units are grams of NaOH.

    asked by Tessa Lehan on March 29, 2015
  19. Biology

    A cell is in an unknown solution. The cell contains 60% water, 10% salt, and 30% other materials. The solution contains 75% water, 5% salt, and 20% other materials. What type of solution is the cell in? isotonic neutral hypertonic hypotonic

    asked by Chey on December 17, 2018
  20. math

    The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are

    asked by josh on November 6, 2008
  21. analytical chemistry

    Adding 10.0 mL of 0.500 M HCl to 100.0 mL of pH = 7 water produces a solution with a pH of 1.34. What is the pH of the resulting solution when 10.0 mL of 0.500 M HCl is added to 100.0 mL of the buffer solution in the introductory example? That buffer

    asked by simona on November 17, 2014
  22. chemistry

    8.058g x 10-2 kg of washing soda na2co3 10h20 is dissolved in water to obtain 1L of a solution of density 1077.2kg/m3. Calculate the molarity, molality and mole fraction of na2c03 in the solution? who helps

    asked by Fai on January 1, 2013
  23. Pre Cal

    Let P be the point on the unit circle U that corresponds to t. Find the coordinates of P and the exact values of the trigonometric functions of t, whenever possible. (If there is no solution, enter NO SOLUTION.) 9pi/4 Looking for sin, cos, tan,cot, csc,

    asked by Karmen on February 10, 2010
  24. chemistry

    Bill prepared 5.00-mL of borax solution at 59.2degrees C. He diluted the solution in an Erlenmeyer flask and titrated it to an endpoint with 27.05 mL of 0.500 M HCl. What is the saturation concentration of borate ions? I don't know what to do here. Does it

    asked by jason on April 9, 2012
  25. Chemistry

    A potassium hydroxide solution has a pH of 12.90. Enough cid is added to react with half of the OH- ions present. What is the pH of the resulting solution? Assume that the products of the neutralization have no effect on pH and that the amount of

    asked by Alexa on May 4, 2010
  26. Chemistry

    What is the maximum mass of cobalt (II) phosphate that will precipitate from a solution prepared by adding an excess of K3PO4 solution to 100.0 mL of 5.0 M CoCI2? Sorry for all the confusion with different names we are working in a group and its easier to

    asked by Marissa on November 16, 2016
  27. Chemistry RUSH, Please

    1) How many grams of CH4 (MM = 16.043) are needed to react with 50.0g of CL2 (MM=70.91)? 2) What is the molarity of a solution prepared by dissolving 20.0 g of methanol, CH3OH, oara sufficient water to prepare 500 mL of solution? Show calculations

    asked by Maria on October 8, 2015
  28. Calculus

    Would someone please tell me how to solve these two problems? Find the indefinite integral: x(x-1)^5 dx (v^2)(1-v)^6 dv

    asked by Richard on November 18, 2009
  29. social study

    what are the ways of solving enviromental problems in your communities?

    asked by bala on March 27, 2014
  30. Math

    I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 81a^6 - 3q^6

    asked by Christy on July 21, 2010
  31. Math help

    I need help on these problems. There over solving equations by factoring. Don't get it at all. 1. (Y+5)(Y-7)=0 2. 2n(n-20)=0 3. (2t-3)(3t-2)=0 4. (2u+7)(3u-1)=0

    asked by Anonymous on March 4, 2014
  32. Math

    I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor 64a - 49^3=

    asked by Christy on July 21, 2010
  33. English

    What is overcoming problems an integral part of life?

    asked by Bailey on August 31, 2010
  34. Math

    I am down to 5 out of 49 problems that I can't figure out. Help is very much appreciated. Thanks ! Factor by grouping: x^3 + 8x^2 -5x -40= I have (x^2 -5)(x + 8) ????

    asked by Christy on July 21, 2010
  35. math

    Can't remember the way to solve for the variable. 5x + 6 = 7x. Answer is 3, but how to do other problems?

    asked by Hannah on November 11, 2012
  36. history

    what problems did Nigeria encounter after oil was discovered there?

    asked by dalton on May 6, 2010
  37. Science gr 8

    What are three problems that fluid technology helps solve?

    asked by Hello on May 4, 2009
  38. math

    writing expressions in algebra story problems

    asked by Anonymous on December 6, 2010
  39. algebra

    i need some examples of addition problems with negative answers can anybody help me ??????????????????

    asked by cody on August 30, 2012
  40. Algebra 1

    What is 28% as a decimal and as a fraction? Also, can you tell me how you got the answer so I can solve the problems myself.

    asked by Dani. on August 29, 2012
  41. chemistry

    acid rain --how does it cause environmental and health problems

    asked by kathy on September 13, 2013
  42. differential equation

    dy/dx=x+y, y(0)=1 How do I solve for y(x)? I know the answer is y(x)=2e^x-x-1, but I forgot how to do these kinds of problems again.

    asked by Anonymous on August 11, 2008
  43. word scramble

    PLEASE HELP!!!! I have a 24 letter word that I am having problems unscrambling.. eyspoopcsadhohgogtasodou

    asked by Lisa on June 13, 2014
  44. Math

    solve: 4x+18=22 please help. i just need to understand how to do this for i have many problems like this on my final, and i have forgotten how!

    asked by EAW on January 13, 2008
  45. algebra

    please i need help factoring these problems....20xy, 36g^2h^2, and 44m^2n

    asked by savannah on August 18, 2010
  46. science

    whats is an organized plan to solve problems

    asked by maya on September 3, 2009
  47. chemistry

    I have problems with the oxidation numbers of a) POCl3 b) HClO3 Please help!!

    asked by anonymous on November 30, 2011
  48. 8th grade

    ok ihave three problems for homework in algebra 1 honors Y+3=3+Y 6*1/2-Y=3*2 3/4+Y=0.75+Y

    asked by brit on August 22, 2008
  49. calc

    If f(6) = 7, g(6) = 5, f '(6) = -2, and g'(6) = 8, find the following numbers. (a) (f + g)'(6) (b) (fg)'(6) How do you go about approaching these kinds of problems? Thanks

    asked by mike on September 29, 2008
  50. algebra

    could someone please explain to me how -5/8 + 1/4 = -3/8? I have several more of these problems -5/8 + -1/6 = -19/24, and more. I have no reference in my text on how to do these. Can someone take me through the steps?

    asked by aria on April 23, 2011
  51. biology

    Which of the following problems do immigration and emigration pose for demographers?

    asked by christy on September 13, 2010
  52. math - algebra 1

    have 5 problems they are simplifying and write standard form #1 (5c-9)(5c+1)

    asked by Bo on September 12, 2012
  53. Algebra

    were suppose to see if its a function or not and i don't get these problems can you explain it to me? 1) X=15 2) y=3x+2y

    asked by James on October 1, 2008
  54. Algebra2

    problems 8 - 11: Give the slope and y-intercept of the given line. 1. 2x-3y=6 2. y=-2x 3. y=3

    asked by amy on November 28, 2012
  55. Environmental Science 11th grade

    What problems are associated with the long-term containment of nuclear?

    asked by Anonymous on February 4, 2013
  56. Math!~Algebra

    Issues with these 2 math problems and no examples in the book. S^8/S^5 -4x^3+9x^2-6x-1

    asked by Sahara on May 26, 2008
  57. Math

    How have proportions been useful to solve various math problems that we have studied?

    asked by Nabila Rahman on October 7, 2008
  58. law/421

    What types of problems was the UCC designed to address?

    asked by at on September 20, 2012
  59. history

    What were a few big problems they saw with conquering foreign lands?

    asked by jess on January 17, 2019
  60. algebra

    I need help with exploring and graphing functions can anyone please explain them to me? The problems look like this: {y=x+3} {y=-2x+3}

    asked by Rayleigh on February 11, 2008
  61. Pigskin Geography

    What are the Interstates for pigskin week seven. They are like the last problems and I can't find them anywhere.!!

    asked by LALA on October 24, 2009
  62. College Algebra

    can someone tell me how to get a division symbol when posting problems in Algebra

    asked by Annie on November 28, 2010
  63. Algebra1

    P=2l+2w Solve for l. Please show me how you got your answer so I will understand how to do these problems. Thank you.

    asked by Samantha on October 25, 2009
  64. exam number 06041600

    do you have the answers for this exam in steps to the math problems? i need help on them.

    asked by lindaemory on December 5, 2012
  65. DrBobb222!! Help!!

    Please look at my Chemistry problems again, I reposted them with the constants and such. I am still confused!

    asked by Jordan on September 11, 2012
  66. Health

    What has the society done concerning the current problems with teen pregnancy?

    asked by Anonymous on February 17, 2015
  67. math

    5/2 has to be made into a mixed number but I'm having problems because i forgot how to do it please help me?

    asked by Alicia on January 11, 2012
  68. english

    What are the most large ecological problems in the world todayÉ

    asked by Rebecca on January 14, 2012
  69. Math(Please help!)

    1. How do the graphs of y=1/x and y=5/(x+6) compare? I need steps because I want to be able to do these type of problems. Thank you!

    asked by Olivia N J on February 16, 2017
  70. IMPOSSIBLE ALGEBRA >:(

    I have to do 10 algebra problems by tomorrow........and i don't know how..... :( 1. 7x-1 = 2x+5 2. 3y+1 = 4y-6 3. 10-y = 2y+3 4. 6x+2 = 1-x 5. 3a-10 = 4+a 6. 5y+4 = 4y+5 7. b+3 = 2b-7 8. 2x-1 = x-3 9. 2w+3 = 4w-5 10. 6n+4 = n-11 please help in any way you

    asked by samma_chan on August 27, 2008
  71. math

    number sense- What two simpler problems can you use to find 9 x 38?

    asked by mike on November 14, 2012
  72. Math

    Estimate the amount in each of the folloing problems. What is 48.3% of 1,500?

    asked by Brenda on September 3, 2008
  73. Math

    Please simplify: Very confused, have many problems like this and need some guidence. Thanks! (root5a^7/2)^4 a^3/a^8

    asked by Angie on June 25, 2009
  74. Health

    what negative physical problems is specifically associated with how heroin is taken?

    asked by Betty on December 16, 2010
  75. public finance

    What are the problems of budget implementation and process in Nigerian

    asked by yahaya on February 11, 2016
  76. critical thinking

    How are the problems in crime, housing and health interrelated?

    asked by dora on April 9, 2015
  77. social studies

    Of the problems experienced by the Confederation Congress, which do you think was the most harmful? why?

    asked by Michaela on November 8, 2009
  78. Math

    For all real numbers, f(x)=(x^2+1)/2. If f(a)=25 and f(11)=b, what could be the value of b-a? I'm confused on how you do these problems. Can someone show me how to do them? Thanks much!

    asked by Monique on May 11, 2008
  79. math

    I've done these problems for the past 4hrs and i can't get them right please its my only questions left.1-12 1.x + 3 > 5 2.7 > x + 5 3.x - 8 ≤ -6 4.-4 < -6 + x 5.9x > 18 6.-3x > 6 7.x/4>0.5 8.x/-14>1/7 9.-10 ≥ 5x 10.-16 ≥ -8x 11.-4x < 8 12.15 ≥

    asked by plshelp on September 19, 2016
  80. Civic

    What are the major local/world civic problems

    asked by Excel on February 27, 2019
  81. algebra homework

    I am having problems with fatoring this problem.Please help. 3x-22xy-16y^2

    asked by kenneth on September 8, 2010
  82. 7/8 Math

    what is the value of x in: -x/3 + 4 = 20 Could you guys please tell me how to do it and include the answer. I have other problems like this where x is negative so I just need to know how to do it :) Thanks!

    asked by Christabelle on September 30, 2012
  83. accounting 250

    help with problems that might occur when balance statement is incorrect

    asked by Axia on October 14, 2008
  84. math

    Find f'(a) for f(x)=4x3+1x f'(a) =? please please help. i just need to figure out how to do it once and then i can do the rest of my problems

    asked by kayla on February 19, 2010
  85. Social Studies

    What are some problems that may come when the National Dream Act is passed.

    asked by Lilly on November 4, 2014
  86. Environmental science

    Do you know of any environmental problems in Del Rio, texas

    asked by Mike on January 8, 2010
  87. Pre-Calculus

    can someone help me with figuring out my math and explaining it to me. or How to use the calculator with the problems ?

    asked by Ty on June 9, 2013
  88. algebra

    can you please help me with this so that i can do my other problems simplify and show alll work -4x^2-3x-(x-x^2+3)

    asked by babygirl on October 2, 2011
  89. geometry

    How are proportions solved when brought out in word problems?

    asked by brooke on November 18, 2008
  90. Math Fractions

    How do you solve this and problems like it: 3/4 of _____ is 90 5/6 of 120 is ______

    asked by Rosie on March 19, 2009
  91. 6th Grade Math

    This is fractions. Not dividing problems. (Ex: 3/5 is a fraction) 5c = 2/3 (divided by) 2/3

    asked by David on April 21, 2010
  92. math

    I need help with 4 mat problems. I do not know how to set up to solve. x/8=-6 -4/9+(-5/7) x-4/5=6/7 7/x=?/xsquared

    asked by will on April 11, 2008
  93. Algebra 1

    How do I find a, b, c, and d, for cubic equations in word problems.

    asked by Jojo on May 17, 2018
  94. math

    how doo i do my my math homeeework:congruence problems.

    asked by ashley on February 24, 2011
  95. algebra

    how do you convert these 2 problems to slope intercept form? -2x=-1y-6 3x+3y=-18

    asked by caroline on March 23, 2010
  96. 9th grade Math

    I need help in creating 3 Math problems that has to do with Baseball. Does anyone know how to or websites to help me...

    asked by Lauren on January 25, 2010
  97. Solving linear equations

    Is there a formula to following or pattern. This is very new to me and I am having issues with these type of problems, please help

    asked by heybaby on February 8, 2013
  98. phil 103

    Logic can help analyze ethical problems. (Points : 1)

    asked by mary on June 17, 2013
  99. science

    Do clown fish encounter problems in its habitat?

    asked by Juan on March 22, 2009
  100. Heron's formula

    some Problems based on heron's formula at home

    asked by Anonymous on July 1, 2014