1. Intermediate Algebra

    Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater

    asked by Samantha on September 10, 2010
  2. statistics

    The diameters of apples in a certain orchard are normally distributed with a mean of 4.77 inches and a standard deviation of 0.43 inches. Show all work. (A) What percentage of the apples in this orchard is larger than 4.71 inches? (B) A random sample of

    asked by Valerie on November 2, 2010
  3. Computer science

    3.We often come across the terminology like 6b-bit processor, 64-bit operating system and 64-bit system bus. Do you understand those terminologies? What exactly those numbers represent? Please find out the exact meaning of three terminologies above (give

    asked by Md Farhad Hossain on February 3, 2013
  4. health and P.E.

    Why is fiber necessary for proper functioning of the digestive system? A:It creates cell membranes, nerve tissue, and substances that aid in the digestion of fat. B:It helps proper functioning of the digestive system and prevents constipation. C:It is

    asked by Jaden on January 6, 2017
  5. microeconomics

    i have to write a paper for a final and need some help with ideas for what I am writing about.. here is the question.... the competitive market system provides highly efficient mechanisms for the allocation of scarce resources to consumers. Using the

    asked by jamie on May 18, 2008
  6. Health care

    My question is, how do I start a radio ad??? Should I just come out and tell about a healthy musculoskeletal system??? Write a 150- to 200-word script for a radio ad that promotes a healthy musculoskeletal system in old age. Address the risk factors for

    asked by Rebecca on June 3, 2010
  7. chemistry-

    How do I construct an ICE table for this question. CH3COOH + NaOH --> CH3COONa + H2O Fill in the equilibrium line of the table. [Think about the initial pH and think about the pH at the end point of the titration. Initial pH 2.72 When the solution turned

    asked by Jason on May 9, 2007
  8. Physics

    A person pushes with a horizontal force of 25 N 4kg block, initially at rest on a horizontal table, a distance of 3m. The coefficient of kinetic friction between the block and table is 0.35. determine external work on the block-table system. the energy

    asked by Star on April 16, 2014
  9. chem

    A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the

    asked by chemdummy on November 1, 2012
  10. chem

    A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the

    asked by chemdummy on November 1, 2012
  11. Physics

    A 255 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-35). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b)

    asked by Maria on March 2, 2011
  12. Physics

    A 255 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-35). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b)

    asked by Maria on March 2, 2011
  13. Physics

    A 260 kg piano slides 4.1 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b)

    asked by Joe on November 14, 2010
  14. Physics

    A 305 kg piano slides 4.0 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the

    asked by Robert on March 23, 2011
  15. math

    A, b, c can complete a work separately in 24, 36, and 48 days respectively. They started working together but C left after 4 days of start and A left 3 days before the completion of the work. In how many days will the work be completed ?

    asked by aneesh on November 15, 2016
  16. Basic Math

    I forgot how to solve for two variables... Please check if I solved both problems properly! Thank you. Equations: (solve for t and z) 12t + 4z = 80 2t + 4z = 20 My answer: t = 2, z = 14 The steps: (simplified it) z = 20 - 3t, z = 5 - 0.5t (equated both

    asked by Anonymous on January 10, 2009
  17. Maths, Physics, Resultant force

    Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from

    asked by Anon on October 19, 2017
  18. Maths

    I need to solve these anagrams of famous mathematitions PHRYGATOAS ADSHERECMI TFMARE GABBEBA COBFIICAN GHETGNINLAI LUDECI PRANIE LLCAOVEE The first one is PYTHAGORAS. For names of other famous mathematicians, check this site:

    asked by Cherish on November 9, 2006
  19. calculus

    A farmer has 180 feet of fence and wants a pen to adjoin to the whole side of the 120 foot barn as shown. What should the dimentions be for maximum area. Note that in this case Write the equation for perimeter of the three sided rectangle. Write the

    asked by Anonymous on May 23, 2007
  20. Maths, Physics, Resultant force

    Hi all, I have been given component x- and y- for F1=(8.0*10^7N,7.0*10^7N) F2=(4.0*10^7N,-2.0*10^7N) for an object. Which following my textbooks have found the following vector components: F1+F2=(1.2*10^8N,5.0*10^7N) Now I want to find the distance from

    asked by Anon on October 18, 2017
  21. Chemistryy....PLEASE HELPP HAVE MIDTERMMM

    A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic

    asked by Sara on October 12, 2008
  22. Chemistry

    A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic

    asked by Saira on October 12, 2008
  23. biology

    Julie took her lunch to work every day. She wanted to know what type of insulation would keep her lunch the coolest. Each day, she took her lunch in a different container: a Styrofoam cooler box, a plastic cooler box and a soft insulated lunch bag. She

    asked by Meagan on September 30, 2014
  24. physics

    A 0.10 kg piece of copper at an initial temperature of 95degC is dropped into 0.20 kg of water contained in a 0.28 kg aluminum calorimeter. The water and calorimeter are initially at 15degC. What is the final temperature of the system when it reaches

    asked by y912f on February 18, 2009
  25. HELP PLEASE!!!!!!!

    A teacher brings 3 gallons of juice on a field trip. There are 36 students on the trip. a. How many fluid ounces of juice does the teacher bring? Show your work. b. Does the teacher have enough juice to give each student a 12-fluid ounce glass of juice?

    asked by Bell on January 14, 2013
  26. Science 2

    One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now , how old will you be when light that is leaving. Arcturus today reaches Earth ? How far, in kilometers, will it have

    asked by Jenny 2 on May 10, 2014
  27. accounting

    Marina Sailboats reports income before income taxes of $80,000 during 20x7. If beginning inventory was overstated by $7,000 and ending inventory was understated by $8,000, calculate corrected income before income taxes for the year. (Show your work.)

    asked by James on June 27, 2009
  28. History

    Immediately after World War II, General MacArthur’s responsibilities included the demilitarization of Japanese society and the: A. elimination of the Japanese emperor. B. trial of American officials charged with war crimes. C. laying of the foundations

    asked by angela on February 19, 2016
  29. math probability

    Formulate but do not solve the problem. A theater has a seating capacity of 840 and charges $4 for children (x), $6 for students (y), and $8 for adults (z). At a certain screening with full attendance, there were half as many adults as children and

    asked by Anonymous on March 7, 2011
  30. Chemistry

    A hydrocarbon gas burned completely in O2 to give CO2 and H2O.It was found that one volume of hydrocarbon gas at STP produced two volumes of CO2 and three volumes of steam corrected at the same temperature and pressure. What is the emperical formula of

    asked by Elie on August 6, 2012
  31. Intermediate algebra

    Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Transform the second expression into the equivalent logarithmic equation; and evaluate the logarithmic equation for three values of x that are greater

    asked by Anonymous on September 12, 2010
  32. math

    Given that 2 log base2 (x+15) - log base2 x = 6 1.Show that x^2 -34x +225 = 0 2. Hence or otherwise solve the equation 2 log base 2 (x+15) - log base 2 x =6

    asked by lindsay on July 10, 2014
  33. 7th Grade Math Help

    It takes Pam 45 minutes to drive to work and 60 minutes to drive home from work. Write the ratio of the time Pam spends driving home from work to the time she spends driving to work in three ways. I got confused so I need someone to help me clear-up my

    asked by MusicLover14 on November 16, 2015
  34. -ECONOMICS-

    Consider a country in which capital per hour of work from 1950 to 1973 grew by 3 percent per year and output per hour of work grew by about 3 percent per year. Suppose that from 1973 to 1991, capital per hour of work did not grow at all and output per hour

    asked by Pale on October 13, 2008
  35. College Chemistry

    a) Water drops, sitting on your skin after a dip in a swimming pool, evaporate. Identify the system and its surroundings for the above process and state the direction of heat transfer. Is the process endothermic or exothermic. Would the system be the

    asked by Molly :) on March 30, 2010
  36. calculus

    determine whether the statement is true or false. If it is true, explain why it is true. If it is false, give an example to show why it is false a) the function f(x)=3/2 +cx^-2 is a solution of the differential equation xy'+2y=3 b) the differential

    asked by jhony on April 10, 2012
  37. algebra

    Complete the following word problems. 14.It takes 9 hours for Isabella to rake leaves by herself,but her brother Matthew can work three times as fast.If they work together, how long will it take them to rake leaves? Rate Time Work Done Isabella Matthew

    asked by Heather on April 24, 2013
  38. Pre-Algebra

    Find each product or quotient. express using exponents 4. Neutral water has a pH of 7. Each one-unit decrease i the pH means that the solution is 10 times more acidic. How much more acidic vinegar is than baking soda if vinegar has a ph of 3 and baking

    asked by TiffanyJ on January 18, 2011
  39. Chemistry

    a solution of 0.2113 g of water dissolv ed in 25g of a solvent freezes at 11.5 degrees celcius below the freezing point of the solvent. what is the Kf for the solvent? A)0.735 B)1.36 c)5.39 D)24.5 Help!!! delta T = Kf*molality Calculate molality = #mols

    asked by natali on April 27, 2007
  40. Physics

    Consider a car starting at rest at the beginning of a 250 m street. At time t = 2.0 s it is 20 m along the street. At time t = 4.0 s it is 80 m along the street. Find its average velocity in the: (a) First 2.0 s (b) First 4.0 s (c) Last 2.0 s My work: I

    asked by Long on June 18, 2014
  41. Physics

    The displacement of a linear damped oscillator is given, for weak damping by x=Ke^(-bΩt) sin⁡(βt+ ε) Show x has a maximum at times given by βt = 2nπ + d where n is an integer and d is gives the position of the first maximum Show also that the ratio

    asked by Bob on June 10, 2011
  42. chemistry

    You weigh out an antacid tablet and determine the mass to be 1.1990 g. After taking a 0.2455 g sample of the antacid tablet, you dissolve it in 25.00 mL of a 0.1006 M solution of hydrochloric acid in a 250.0 mL Erlenmeyer flask. After heating the solution

    asked by zee on April 2, 2015
  43. Algebra

    I had to solve 2x^2-x-1 using the quad. formula. I got it down to (1 +/- the square root of neg. 8) divided by four. I broke the sq. of neg. 8 into the sq. root of 4 and the sq. root of -2. But my question is could it also be the sq. root of -4 and the sq.

    asked by Corinna on October 10, 2009
  44. Business

    Why are union officials likely to oppose flexible work hours and other innovative work schedules?

    asked by Duane on July 5, 2015
  45. algebra

    Will someone please simplify and clearly define the terms "Rate," "Time," and "Work done," as it relates to the work done by one or more persons. Thank you so much!

    asked by Anneliese on June 7, 2017
  46. English

    Using Debating rules how would you define the term 'at work' as used in this sentance "If you need me I will be at work. Call me" Please help Thanks Minnie

    asked by Minerva Wisdom on July 23, 2008
  47. Calculus

    Is x^2 - 2x 1 to 1? I keep getting yes every way I try to work it. Book says no. In the end, I get (with x1=1 and x2=-1

    asked by Elisabeth on June 25, 2010
  48. mugwazeni

    IAm doing grade 10 and my subject are;history ,geography and economics so I want to know what kind of work am I going to work

    asked by precious on June 29, 2015
  49. College Algebra

    How do you work out this problem? 3x3 + 2x2 + 3x+2 I showed three different people my work an they said I did it wrong I am so confuse.

    asked by Crystal on May 15, 2013
  50. physics

    Why bother using a machine if it cannot multiply work input to achieve greater work output?

    asked by Chris on April 27, 2013
  51. estem

    how much work is done on a vacuum cleaner pulled 5.0m by a force of 45.0 N at an angle 35 above the horizintal? solving work

    asked by tosin on October 11, 2011
  52. Management

    operational planning sets up work schedules, routine work procedures, and timetable

    asked by Luis on February 16, 2013
  53. physics

    16. How much work is done on a bookshelf being pulled 4.00 m at an angle of 35.0„a from the horizontal? The magnitude of the component of the force that does the work is 87.0 N

    asked by michelle on October 22, 2010
  54. art

    i am researching a piece of art work by frida kahlo and i need more infomation about he work, any sujestions?

    asked by sophie on February 4, 2010
  55. physics

    hi, reading over momentum notes and i just want to clarify a few things. if i had a system containing a cart that was moving (cart 1) and then a cart that was stationary (cart2)would there be any net external force acting on the system between the initial

    asked by dave on November 13, 2011
  56. physics

    Two masses are connected by a light string passing over a frictionless pulley as shown on Figure. The M2= 6.1 kg mass is released from rest at height h = 2.8 m . We are given that M1=2.7 kg and I, the moment of inertia of the pulley is I = 0.198 kg m2 and

    asked by Serena on November 4, 2014
  57. chemistry

    A hydrochloric acid So of concentration 1mol/l and a solution S1 of concentration C1= 2×10^-2 mol/l to be prepared from So. The available materials are given below: ● Volumetric pipet: 5ml, 10ml, 20ml ● Beakers: 100ml, 250ml, 500ml ● volumetric

    asked by angy on December 13, 2016
  58. Algebra 2

    1. What is the determinant of the matrix? [5 6] [2 9] a. -33 b. 6 c. -6 d. 33

    asked by Anastassia on May 4, 2016
  59. math

    (1) if the second and fourth term of a G.P are 8 and 32 respectively,what is the first term? (i need a practical solution please.) (2)the eleventh term of an A.P is 25 and its term is 3 find common difference? (also need practical solution.) (3)given the

    asked by cadarii on December 29, 2010
  60. math

    First try to solve the equation by factoring. If you are unable to solve the equation by factoring, solve the equation by using the quadratic formula. For equations with solutions that are irrational numbers, give exact solutions and approximate solutions

    asked by anonymous on September 27, 2018
  61. Chemistry

    In aqueous solution, hypobromite ion, BrO-, reacts to produce bromate ion, BrO3 -, and bromide ion, Br-, according to the following chemical equation. 3BrO-(ag) → BrO3 -(ag)+2Br-(ag) A plot of 1/[BrO-] vs. time is linear and the slope is equal to 0.056

    asked by Jason on February 19, 2011
  62. Introductory Physics

    I am really nervous about mathematics, so I just want to make sure I am doing these problems correctly. I figure if I am getting the incorrect answer, I must be doing them incorrectly and need to work on them some more. I THINK I have them correct, but I

    asked by Cecelia on March 30, 2011
  63. algebra

    Month Price April (x=1) 114 May 108 June 87 July 100 August 95 September 112 October 93 November 86 December 64 Please show work. This is the answer I got: 13/17 22 hours ago - 3 days left to answer. Additional Details I think it was suppose to a slope

    asked by cjl on November 2, 2009
  64. S.S

    in what way did the structure of the Virginia house of the Burgesses influence the governments of the states and eventually the national government created by the U.S. Constitution? A. It established an elected representative legislature B. It set up a

    asked by Help on September 27, 2017
  65. Math

    A diagram measuring 20 cm long is reduced on a copy machine to 15 cm long. If the width of the original copy is 16 cm, what is the width of the reduced copy? Show your work.

    asked by Kiana on February 22, 2016
  66. algebra 1

    Natalie made a mistake in the following problem. What line was the mistake made in? Show your work and give the correct answer. Line 1 6(4) ÷ 2 − 1 + 5 Line 2 6(4) ÷ 1 + 5 Line 3 24 ÷ 1 + 5 Line 4 24 + 5 Line 5 29

    asked by marcus on December 22, 2010
  67. MATH

    rowan raised $640 in a charity walk last year. This year he raised 15% more than he raised last year. How much money did rowan raise this year? SHOW YOUR WORK.PLEASE HELP ME

    asked by Alexis on April 25, 2012
  68. math

    A diagram measuring 20 cm long is reduced on a copy machine to 15 cm long. If the width of the original copy is 16 cm, what is the width of the reduced copy? Show your work.

    asked by annabelle on February 22, 2016
  69. Statistics

    A carload of stone taken from a quarry by the plug-and-feather method contains pieces of stone have a mean weight of 1,500 pounds and a total weight of 36,000 pounds. Another carload of stone produced by the explosive method (where stone is blasted into

    asked by Carly on September 18, 2013
  70. Math

    What is the solution to the nearest tenth to the equation below? -3x -14 less than or equal to -5 * sorry if í wrote the question weird but í couldn't do some equation signs* A. X less than or equal to -3 B. X less than or equal to 3 C. X greater than or

    asked by Anonymous on August 28, 2017
  71. Government

    Weigh the advantages and disadvantages of the current democratic system. In the chapter on the presidency, for example, you must determine the most and least important presidential power. I have some ideas like the pros are the checks and balances system

    asked by Stephanie on February 21, 2010
  72. chemistry

    I have two solutions of 0.1 Molar. A solution of magnesium chloride and a solution of potassium chloride. I thought that the 0.1 M solution of magnesium chloride would conduct electricity better than a 0.1 M solution of potassium chloride. I did a lab in

    asked by charlie on May 11, 2011
  73. Calculus

    Let h(x)= x^3 + 4x -2. Let g(x) represent the inverse of h(x). Find g(14). I know that if (a, f(a)) is on h(x), then (f(a), a) will be on g(x). I also know that if f^-1(a)=b if f(b)=a. I thought that if I could find the x value(s) at which h(x)=14, I would

    asked by Kelly on March 31, 2009
  74. Chemistry

    If 1.22 grams of magnesium reacts with 100 ml of 6.02 M HCl solution. How much heat is evolved? Density of the HCl solution is 1.10 g/ml. Assume the specific heat of water 4.184 J/gC is the specific heat of the solution. Mg  +  2 HCl   à  MgCl2  + 

    asked by Anonymous on July 17, 2012
  75. Chemistry

    A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL. My solution: ? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g The correct answer is 3.76E-2 mol. Please help!

    asked by Anonymous on March 22, 2015
  76. Chemistry

    1000g of a 50%(mass percentage) nitric acid solution is to be dil ute to 20%(mass percentage) nitric acid solution.how many lit ers of water should be added to the starting solution?

    asked by Dewa on October 27, 2011
  77. Algebra

    I cannot seem to work this problem out correctly as all answers found do not make the equation work. 1/4 - 2/3y = 3/4 - 1/3y

    asked by Bruce on October 3, 2007
  78. Physica

    How much work is done by a person lifting 2 Kg object from a bottom of a well at constant speed of 2 m is ( work =...... kj )

    asked by Q16 on July 15, 2012
  79. physics

    Im confused! How would you calculate the work done by a plane? I know work= f d, i just don't know how to get the force and distance!

    asked by Maddi on November 30, 2010
  80. math

    the key...^=exponent QUESTION: What is 2^3-6x3^2 Can anyone help me please!!!! 2^3 is 8 3^2 is 9 I will be happy to check your work. is it 1? [[[help]]] u there No, of course not. Where is your work?

    asked by jessica on October 5, 2006
  81. science

    If you lift a bag that weighs 15 N a distance of 2 m, how much work have you done? work=weight*distanceupward

    asked by ryan on June 16, 2006
  82. math

    my 7 year old is having problems doing his work. can you please give me some work sheets for him that are fun and educational.

    asked by celia on January 13, 2017
  83. math

    a drug is supplied as a 20 mg/ml solution in a 50 ml vial. you need to make 15 ml of a 10 mg/ml solution. how much concentrate and how much diluent are needed to obtain the desired final volume?

    asked by kate on July 9, 2014
  84. Science ap chem

    For which of the following solutions must we consider the ionization of water when calculating the pH or pOH? (a) 3 × 10−8 M HNO3 (b) 0.10 g HCl in 1.0 L of solution (c) 0.00080 g NaOH in 0.50 L of solution (d) 1 × 10−7 M Ca(OH)2 (e) 0.0245 M KNO3

    asked by Anonymous on March 11, 2016
  85. Chemistry

    use the Hendeson-Hasselbalch equatio. To calculator the pH of a solution at is A) 0.15 M on C5H5N and 0.10M in C5H5NHCl. Kb:1.7x10^-9 B) 15.0 g of HF and 25.0g of NaFin 125 ml of a solution. Ka 3.5x10^-4

    asked by Jill on April 1, 2013
  86. chemistry

    what mass, in grams of nacl formed from the reaction of 2.75ml of a 6.00M Na2SO4 solution and 8.30ml of a 2.50M solution of HCL

    asked by bayor on November 15, 2013
  87. Chemistry

    Express the concentration of a 0.0900 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.

    asked by Tsomo on July 6, 2014
  88. science

    Compound A is provided as a 500mM solution. If 12.5 mL is taken and added to 12.5mL of water, how many moles (or millimoles / micromoles) are there per 0.1mL of the diluted solution?

    asked by jake on December 9, 2011
  89. Chemistry

    calculate the concentration of the silver ion remaining in the solution when 10g of solid AgNO3 is added to 50 ml of 1x10-2 M NaCl solution.

    asked by jeremy on May 18, 2014
  90. Science

    What is the molarity of a solution of sodium hydroxide, NaOH, if 23.64 mL of this solution is needed to neutralize 0.5632 g of potassium hydrogen phthalate (KNaP)?

    asked by Mini on February 5, 2009
  91. maths

    A solution of acid was found to have a pH of 1.50. What is the hydrogen ion concentration of the solution? (Give your answer in scientific notation to 3 significant figures.)

    asked by bronson on December 28, 2008
  92. chemistry

    Calculate the pH of a solution formed by the addition of 25.00 g of sodium acetate, NaC2H3O2 , to 450 mL of a 0.210 M solution of acetic acid, HC2H3O2

    asked by lamp on July 21, 2014
  93. Chemistry

    How many milliliters of 0.201 M Ba(OH)2 solution are needed to completely neutralize 12.8 mL of 0.369 M HNO3 solution? The reaction is Ba(OH)2(aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(l)

    asked by Mary on November 1, 2011
  94. chemistry

    What is the molarity (moles per liter) of an aqueous solution that is prepared by dissolving 5.58g NaOH (MW=40) in enough water to make 250mL of solution?

    asked by Kishwa on March 28, 2013
  95. Chemistry

    85ml of 0.1M h2so4 solution is titrated against 0.1N koh solution . Calculate the concentration of salt formed when the acid is one fourth neutralized.

    asked by Piyush on January 27, 2018
  96. Chemistry

    A solution that contains 2.047 x 10^-1 M of acid, HA, and 1.808 x 10^-1 M of its conjugate base, A-, has a pH of 4.196. What is the pH after 1.629 x 10^-3 mol NaOH is added to 5.961 x 10^-1 L of this solution?

    asked by Summer on January 21, 2012
  97. Chemistry

    you have75.0ml of 2.5 M Solution of Na2CrO4(aq). You also have 125ml of a 1.74M solution of AgNO3(aq)Calculate the concentration of NO3 when the two solutions are added together

    asked by Logan on February 27, 2011
  98. Chem

    calculate pH of the buffer solution prepared by mixing 10 mL of 1.5 M HCl with 100 mL of 0.1 M K2CO3 solution. For H2CO3: Ka1= 4.46 e^-7, Ka2= 4.69e^-11

    asked by Sam on November 12, 2008
  99. chem

    The molar mass of hydrogen fluoride, HF, is 20.0 g/mol. If 17.0 grams of HF are dissolved in water to give 200.0 mL of solution, what is the molarity of this solution?

    asked by angel on November 12, 2015
  100. CHEM 102

    A solution of volume 0.500 L contains 1.70g NH3 and 4.15g (NH4)2SO4. What is the pH of this solution? Answer obtained was 9.76, however it states that it is slightly off...

    asked by Calvin on October 21, 2011

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