1. Chemistry help please

    What is the pH of a solution whose hydronium ion concentration is 0.0010 M?

    asked by Mary on March 26, 2012
  2. college Chemistry

    What is thhe pH of 500mL of solution containing 0.0124 grams of Ca(OH)2?

    asked by jahil on May 2, 2010
  3. 10th grade Chemistry

    What is the hydroxide ion concentration in a solution with [H3O+] = 7.67*10^-9 M?

    asked by gab on December 8, 2010
  4. Bio Chemistry

    what are factors affecting rate of solution formation?

    asked by Sharon on October 6, 2011
  5. Chemistry

    Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.26 M Na2HPO4.

    asked by Maddie on April 14, 2013
  6. Algebra 2

    what is the positive solution of the equation 5x^2 + 2x -16 =0? solve by factoring.

    asked by Zach on December 8, 2014
  7. math

    is each ordered pair a solution of the given system? write yes or no. y=6x+12 2x-y=4 (-4,-12)

    asked by Anonymous on April 25, 2010
  8. math

    is each ordered pair a solution of the given system? write yes or no. y=6x+12 2x-y=4 (-4,-12)

    asked by Anonymous on April 25, 2010
  9. Chemistry

    What is the molarity of 350 mL of solution that contains 27 grams of CaCl2?

    asked by Becky on November 5, 2010
  10. Math 20-1

    What is the solution for 2x^2-7x > always greater than -3 ? (2 marks) (Show your work)

    asked by Alex on January 28, 2015
  11. algebra 2

    x^2 - 3x + 5 = 0. solve using quadratic formula. show solution

    asked by em on January 15, 2014
  12. Chemistry

    Calculate the concentration of all species in a 0.240 solution.

    asked by Anonymous on March 27, 2012
  13. math

    Prove that sinx=x for x is a real number has only one solution at x=0

    asked by Andre on February 15, 2016
  14. Algebra1

    -3(x+3)=-3(x+1)-5 how to solve for x please help / the answer has to be 6,,,-6,,,all real numbers,,, or no solution .???????????????????????????????????????

    asked by Robbie on September 15, 2014
  15. Chemistry help please

    What is the pH of a solution whose hydronium ion concentration is 0.0010 M?

    asked by Mary on March 26, 2012
  16. chemistry

    what is the pH of an 0.155M aqueous solution of acetic acid if the Ka is 1.8 EE -5?

    asked by Anonymous on December 1, 2010
  17. math

    Solve the following equation for the variable. 7/x-4+4/x+4=2x/x^2-16. The solution is x= ?.Thank you in advance.

    asked by Kay on July 2, 2009
  18. calculus

    Please help find the solution to the initial value problem dy/dx=(1+2cos^2 x)/y with(y>0), and y=1 when x=0. Thanks.

    asked by John on April 29, 2011
  19. Algebra

    8w less than or equal to 9w - 5 or 1-4w > 25. Enter the solution using interval notation?

    asked by Student on January 5, 2016
  20. chemistry

    Determine the pH of a 1 M aniline solution (Kb = 4.2 10-10). I am unsure how to start, any help?

    asked by Logan on November 13, 2015
  21. algebra

    solve the elimination method 7r-3s=0 3r+7s=58 what is the solution of the system

    asked by john on September 6, 2011
  22. MATH

    Perform the operation for each equation, if there is a solution (Matrices) [4k -8y ] [5k+6y 2k+1] [6z - 3x] - [2z+5x z+4] [2k + 5a] [4k+6a 3a+2]

    asked by Daria on December 1, 2010
  23. chemistry

    How many moles of hno3 neede to prepare 7.5 l of a 5.6m solution

    asked by krystal on March 19, 2013
  24. Math

    So i was given a graph of h(x) and i am supposed to approximate h^-1(3) but i'm not sure about how to do it. could anyone tell me how to find the solution? THANKS!

    asked by Abby on August 24, 2010
  25. Chemistry

    Calculate the molarity of 15.4 g of ethanol (C12H22O11) in 71.0 mL of solution

    asked by Kiana on February 27, 2011
  26. Algebra-Please Help!!

    What is the solution of x-4 is less than 4 and x + 4 is greater than 7 Please show how you did it so I can look at it and learn how to do them in the future Thanks

    asked by Joe on September 7, 2010
  27. chemistery

    in a solution of pH of 3.26, the molar concentration of the hydronium ion is ?

    asked by ogb on December 9, 2012
  28. Chemistry

    to prepare 50.0 g of 10% NaNo3 solution you will need how many grams of solute

    asked by Emilee on May 8, 2017
  29. science

    how do u prepare a 250-ml of 2.35 M HF dilution from a 15.0 M stock solution?

    asked by jacob on November 28, 2018
  30. NEED help ON MATH PLZ

    Graph the solution set on a number line : 3x+4>-8

    asked by David on December 12, 2012
  31. Math/ Algebra

    Ms. Sue please I need help with these two problems! Tell whether the given number is a solution of each question 5b+1=16; -3 14=1/3x+5;27

    asked by Algebra Please Help Ms. Sue! on October 10, 2016
  32. Math

    Solve the inequality and describe the solution set. y-6>12 - Is it y – 6 ≥ 12 y – 6 ≥ 12

    asked by Sliverstream on May 17, 2019
  33. Chemistry

    Is 20.0 mL of 1.0M CH3COOH and 10.0mL of 1.0 M NaOH a buffer solution of 3?

    asked by Anne on May 4, 2010
  34. Analytical Chemistry

    principles behind the dilution and aliquoting of the NaOH solution

    asked by Charie on September 13, 2014
  35. math

    solve by substitution 7x+6y=7 x=58-9y What is the solution of the system? (7,-5) is this correct?

    asked by jason on June 29, 2009
  36. Algebra 2 Rational Equations

    What is the solution set of the equation? I know the answer is {-1} I just don't know how to get there. X^2-16 x-3 --------- = ------- -1 (x+4)(x+2) (x+2)

    asked by Josh on December 6, 2012
  37. chemistry

    How many moles of KBr are there in 35.8ml of a 0.172M solution?

    asked by n/a on March 11, 2011
  38. Algebra

    What is the solution of x-4 is less than 4 and x + 4 is greater than 7 Please show how you did it so I can look at it and learn how to do them in the future Thanks

    asked by Joe on September 7, 2010
  39. math exam tommrow review

    find the solution of each equation if the replacement sets are x:{1,3,5,7,9} and y:{2,4,6,8,10}. 3x-9=12 y^2-5y-11=13

    asked by ellis on December 18, 2012
  40. Science

    Estimate the pH of a solution containing 0.5 L of 0.4 M HClO4 and 0.5 L of 0.2 M NaOH without using a calculator.

    asked by Tina on March 9, 2016
  41. Algebra

    Identify the solution(s) of the system of equations, if any. -6x - 4y = 24 8y = -12x - 48

    asked by Tia on June 2, 2013
  42. chemistry

    Calculate the pH of a 0.35 M solution of dimethylamine, (CH3)2NH.

    asked by donna on December 7, 2009
  43. mathematics-abstract equations

    x+y+√z=148 x+√y+z=82 √x+y+z=98 find x,y,z given that x,y,z are all positive integers. Please i need the solution #thanks

    asked by P1 on April 20, 2016
  44. 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 how do you do this?

    asked by bob on March 17, 2012
  45. Chemistry

    What is the percent KCL by mass in a 3.00 molal solution?

    asked by Ann on March 17, 2014
  46. Algebra

    Identify the solution(s) of the system of equations, if any. x+5y=5 2x-15y=0

    asked by Tia on June 2, 2013
  47. chemistry

    Could tell me an experiment which a spectrophotometer would be useful, other than finding the absorbency of a solution? Thanks

    asked by Alton on December 8, 2008
  48. feedback

    Your app is worst. It shows everything except solution of a question

    asked by Ronit on November 1, 2018
  49. college

    Which of the following choices is a solution for: (-3-i)x1 + (1-2i)x2 = 0 (-7-9i)x1 + (7-4i)x2 = 0 for any value of the variable t [x1] = ? [x2] A: [5] [1+7i] * t B: [5] [1-7i] * t C: [5] [-1-7i] * t D: [5] [-1+7i] * t This is linear algebra by the way;

    asked by Michael on December 4, 2009
  50. Numerical Analysis

    show that the equation xcosx-2x2+3x-1=0 has at least one solution in [0.2,0.3]

    asked by jessy on November 2, 2012
  51. chemistry

    What is the concentration of a solution if the absorbance is 0.66 and the constant (a x b) is 8.2 L/mol?

    asked by aaloy on October 1, 2008
  52. product matrix

    which product represents the solution to the system 3x+4y=-2 and 2x+5y=6 [3 2]*[-2 [4 5] [6] 1/7[3 2]*[-2] [4 5] [6] [5 -2]*[-2] [-4 3] [6] 1/7[5 -4]*[-2] [-2 3] [6] could someone explain

    asked by Anonymous on August 29, 2008
  53. Chemistry 151

    Calculate the concentration in g/dm3 of HNO3 in solution A. (H=1; N=14; O=16; Na=23)

    asked by Esther on April 10, 2017
  54. Chemistry

    What is the mass of ethylene gycol dissolved in 5.00 kg of a 40.0% solution?

    asked by Nicole on May 4, 2013
  55. Chemistry

    A detergent solution has a pH of 11.63 at 25°C. What is the hydroxide-ion [OH-] concentration?

    asked by S on February 21, 2012
  56. physical science

    What is the pH of a 0.01 M solution of the strong acid HNO3 in water?

    asked by breiann on January 23, 2012
  57. MATH I just need explanation very easy ( for you)

    Completing the Squares F(x) =x^2+3x+2 F(x)=0 X^2+3x+2=0 WHY DIDN'T IT BECOME -X^2-3X-2 ? ( EXPLAIN THIS PLEASE) Next for the solution X^2+3x+3(3/2)^2 = -2+(3/2)^2 (X+3/2)^2=-2+9/4 (X+3/2)^2 = 9/4 -8/4 =1/4 ( WHERE DID THEY GET 8/ 4?

    asked by Miracle on February 15, 2016
  58. chemistry

    how many grams are contained in 500.g of a 25% solution of H2SO4?

    asked by jessica on February 13, 2012
  59. math

    Solve by the substitution method. What is the solution of the system? 3x+9y=48 -6x+y=56

    asked by Bre on January 20, 2012
  60. Chemistry

    Is there any way to increase the ionic strength of a solution without increasing the pH?

    asked by Jenny on February 12, 2012
  61. Statistics

    What would be an example with solution of the Poisson distribution in the frequency of repurchases?

    asked by Patte on May 21, 2018
  62. Algebra

    What would the solution to this system of equations be? y = x - 50 y = 0.6x I got (138.8, 83.3), but that doesn't seem right at all.

    asked by Kathy on January 27, 2014
  63. Chemistry

    Can you determine the pH of a 1 liter solution having an H concentration of 1.0*10 to the negative 3.5

    asked by Tia on April 28, 2011
  64. math

    determine if the ordered pair is a solution to inequality (5,2) 2x + 7y > 23

    asked by Anonymous on November 8, 2016
  65. Chemistry

    Which solution below has the highest concentration of hydronium ions? pH = 9.82 pH = 12.6 pH = 7.93 pH = 3.21 pH = 7.00

    asked by DrewS on March 19, 2013
  66. Math

    Graph the solution set for the of linear inequalities. x−y≤3 x+3y≤3 x≥−2

    asked by Keonn'a on October 18, 2018
  67. Chemistry

    What volume of 0.100 M K2S solution contains 3.5 g of the solute?

    asked by Page on November 20, 2018
  68. Algebra1solutions help

    Any help would be appreciated. Thank you. What are the solutions of the system? y = x2 + 3x – 4 y = 2x + 2 Options: (–3, 6) and (2, –4) (–3, –4) and (2, 6) (–3, –4) and (–2, –2) no solution

    asked by Jennifer W. on May 29, 2013
  69. Language

    Write the complete subject in each sentence. 1/The sound of the piano mixes with the sound of the voices. 2/Beautiful music floats on the evening air. 3/Their next-door neighbors hear the music. 4/mrs. Ruiz listens from her window. 5/The tired woman falls

    asked by Joji on October 26, 2013
  70. spanish

    luke y renato / venir / a tu casa / para escuchar música nosotros / poder / almorzar / con lori y roberto thad y lorenzo / preferir / salir / con sus amigos berta y amanda / querer / almorzar / en el parque can someone help i am lost i have to put these

    asked by mike on June 11, 2013
  71. English

    Read the sentences then put any words in () that are a title or a foreign expression Dad likes to listen to (Car Talk) on the radio. The (USS Saratoga) was an aircraft carrier. Dad listens to the album (Free As a Bird) We saw the modern sculpture (Flying

    asked by Jerald on December 3, 2012
  72. Chemistry 1150

    Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction:

    asked by Smith on February 25, 2014
  73. Presidents

    Can someone please find me a powerpoint presentation over President Andrew Johnson? Thanks I put "Powerpoint, Pres. Andrew Johnson" into Google and got a number of presentations. Here is the result.

    asked by John on November 10, 2006
  74. Math

    I'm having hard time understanding input/ output If input is 2 3 5 1 and output is 9 12 18 6 then if I put is 7 what is output

    asked by Sheena on October 9, 2017
  75. math

    how do you put 80,000,000+40,000+900+60 in word form and standard form?

    asked by angelina on May 17, 2019
  76. English

    Thank you both for helping me. I just wanted to know if the folliwing two words are correct:"them" and "alerts". 1) Go through security and show your passport.Put your hand luggage and any metal object in a basket for them (?) to be scanned. 2) Then walk

    asked by Henry2 on October 3, 2011
  77. math

    the inverse cosine of negative 0.947 Put it in your calculator... The sequence of keys in my old ten dollar calculator is .947 +- 2nd COS Other calculators have different keys strokes. If you want to be neat, type this into a google search window:

    asked by latoya on November 3, 2006
  78. Language Arts

    In the third wish the king of the forest claims that he has yet to hear of the human being who made any good use of his three wishes in a paragraph consider whether mr peters proves the king wrong do mr peters wishes bring him happiness does he put his

    asked by Marisa on September 12, 2017
  79. Math

    The Rosana family decided to put in a patio and a garden in their backyard. The next part shows a rectangle with a base of 8 and height of 4. It also has about 1/3 of the rectangle shaded and is labeled "Garden" I tried multiplying 4 x 8, then dividing by

    asked by May on November 16, 2016
  80. Physics 1

    A sprinkler mounted on the ground sends out a jet of water at a 35 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 10 m/s. How far does the water travel before it hits the ground? This is my work: d=(10)sin2(35)/9.81 but I do not

    asked by Kerigan Pollz on June 19, 2017
  81. Math

    how an I tell if this is a circle or an ellipse? also, how am I supposed to solve it? -x^2+2y^2+8x+3=0 I answered a similar question for Jordan last night at 11:20 divide your equation by -1 to make it start with a positive x^2 term. At this point you

    asked by Darrin on April 4, 2007
  82. English

    Toss a coin. And if you get a head, move one space forward, and put a marker in the space. If you get a tail, move two spaces. Look at the word or picture on the space. By using it, make a sentence on the right side of the page. (Would you check the

    asked by rfvv on May 19, 2012
  83. English

    Could you tell me which words in column A have the same vowel sound as the words in clumn B. Column A Column B Path Butter Here Weight Saw Trouble Wide Put Hit-------------- File Look Weird Stool Laugh Luck Taught Heat Cheese Table Prune Pronunciation Eye

    asked by diana on December 19, 2007
  84. chemistry needs another look plz

    Posted by Lori on Tuesday, December 14, 2010 at 5:38pm. The mole fraction of an aqueous solution of potassium perchlorate is 0.125. Assuming that the density of this solution is 1.20g mL-1, calculate the following: (A) the mass percent of potassium

    asked by Lori on December 14, 2010
  85. College English 101

    In the following sentence I have to put either (Direct Object, Indirect Object, Objective Complement, Predicate Noun, or Predicate Adjective) for the underlined word. 1. In spite of what I know, I consider all snakes dangerous. (dangerous) is the word to

    asked by Theresa on January 30, 2010
  86. Math

    For 7 days keep track of the number of pieces of mail you receive at your home. a. Put your data into a frequency table having intervals of 0–4, 5–9, 10–14, and 15–19. b. Use the frequency table to create a histogram of the data. c. Do you notice

    asked by 7thgradestudent on May 5, 2016
  87. History

    Who were the "antis" (ant-imperialists) and why were they opposed to U.S. expansion? (HINT: different people had very different reasons.) Try to put yourself in the shoes of someone living in the 1890s: do you think you would have supported or opposed

    asked by Tay Tay on February 17, 2015
  88. Physics

    I am having some problems trying to figure this out. Series circuits I have a "d" battery, a battery holder, 3 different resistors, and a multimeter. How do I put the resistors into a series cicuit? And when I use the multimeter, does it need to be set on

    asked by Soly on October 15, 2007
  89. bibliography

    I'm writing an essay and I know after a quote, you write the author's name in parenthesis. however, i'm using a quote from a website, the article doesn't have an author. it is a website that just states statistics about my topic and issues and problems. so

    asked by julie on November 1, 2007
  90. Calculator help

    i have a ti 83, and i want to plug this equation r=1+cos(theta)( this is polar coordinates) into my calculator but the graph does not look right. i think i messed around with the windows or table set menu and i cant fix it. can someone tell me what numbers

    asked by tom on March 26, 2011
  91. Science

    The Ka for the H2PO4–/HPO42– buffer is given by the equation: Ka= ([HPO4^-2]gamma [H^+])/[H2PO4^-]=10^-7.20 What is the pH of a 2:3 mixture of H2PO4– to HPO42– at 0.10 M ionic strength? (See the table for the activity coefficients.) I just am not

    asked by Cat on December 3, 2014
  92. math

    Question: A student took a test composed of 20 question, with correct answers worth 2 points. If the student received 34 points for his grade, how many questions were correct? I KNOW THE ANSWER IS 17 BUT PLEASE PUT IN AN EQUATION FORM ex: (20x2)-34 =

    asked by paully on October 26, 2010
  93. Physics

    (a) Determine the amount of work (in joules) that must be done on a 95 kg payload to elevate it to a height of 1007 km above the Earth's surface. 1 ? MJ (b) Determine the amount of additional work that is required to put the payload into circular orbit at

    asked by Steve on March 21, 2011
  94. algebra

    I'm sorry I don't know how to put in the square root sign...I hope you can understand what I'm getting at : ) multiply and simplify radical expression. square root 7(2square root3 + 3square root7)= ? sqrt 7*(2 sqrt 3 + 3 sqrt 7 = 2 sqrt 21 + 21

    asked by kris on June 29, 2007
  95. Annuities

    You are earning an average of 46500 and will retire in 10 years. If you put 20% of your gross average income in an ordinary annuity compounded at 7% annually, what will be the value of the annuity when y ou retire? I am not sure how to figure this out and

    asked by Scott Ingraham on April 12, 2008
  96. Algebre=Please check

    Could someone check my answers for these two questions, please? What is the equation of the line which includes points (2,6) and (0,0) y = -3x+1 y = -3x y=3x ( my answer) y = 3x+1 Equation of line with slope m = -3 and including point (5,) is y = - 3x+20 I

    asked by Jackie on January 13, 2011
  97. math

    Isaiah and Chakshu went to dinner at Chili's restaurant and received a bill for $35. Isaiah paid the bill along with an additional 20% tip on his charge card. What was the total amount that he put on his charge card?

    asked by kelly on February 25, 2013
  98. algebra

    need help please!!!!! (fraction) _____1____ 9x^-2 y^-1 I'm not exactly sure what you want to do but i'm assuming you want your exponents positive? just put the varibles with the negative exponents in the numerator. whenever you have a negative exponent

    asked by kairi on March 7, 2007
  99. Language Art's

    3.)Which principal part of the verb to know appears in sentence 1? The Sentence:Everything I know about gardening i learned from my good friend sandy. A.)Past Participle B.)Present Participle C.)Past D.)Present I Put B, IS IT CORRECT?

    asked by Douglas on October 16, 2015