# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 190
1. ## Probability

Let X be a continuous random variable. We know that it takes values between 0 and 3, but we do not know its distribution or its mean and variance. We are interested in estimating the mean of X, which we denote by h. We will use 1.5 as a conservative value

asked by Help on April 29, 2015
2. ## Chemistry

These are the problems I am having trouble with. 1.The first step of the synthesis is described by the reaction below. When 1.750 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4 , the theoretical yield of FeC2O42H2O is how many grams?

asked by Thanh on January 26, 2009
3. ## Math: Linear Programming

Describe the linear programming situation for this system of inequalities. x≤1 , y ≥0 , 3x+y≤5 infeasible unbounded an optimal solution alternate optimal solutions Describe the linear programming situation for this system of inequalities where you

asked by HC on October 4, 2011
4. ## Chemistry Dr. Bob

Now, I'm going to post how to figure out the theoretical yield of carbon dioxide from 1.00g sodium bicarbonate... The reaction of citric acid and sodium bicarbonate is written as H3C6H5O7(aq) + 3 NaHCO3(aq) → Na3C6H5O7(aq) + 3 H2O(l) + 3 CO2(g) Um.. I

asked by Jennie on March 3, 2015
5. ## Statistics

Find the probability that the sum is as stated when a pair of dice is rolled. A.4 or 11 or doubles B. 8,given that the sum is greater than 4. C.Even,given that the sum is greater than 4. A. 4 can be obtained by 1&3, 3&1 or 2&2. 11 can only be obtained by

asked by Mary on April 2, 2007
6. ## PHYSICS 6A centripetal acceleration

A jet pilot takes his aircraft in a vertical loop. If the jet is moving at a speed of 1100km/h at the lowest point of the loop: A)Determine the minimum radius of the circle so that the centripetal acceleration at the lowest point does not exceed 5.5g's

asked by Daisy on May 9, 2012
7. ## Physics: Rotational Motion

A 0.005kg bullet travelling horizontally with a speed of 1000m/s enters an 18kg door, embedding itself 10cm from the side opposite the hinges as in figure. The 1m wide door is free to swing on the hinges. a) Before it hits the door, does the bullet have

asked by Anonymous on October 18, 2012
8. ## Pysics

A 0.480 kg, 37.5 cm long metal rod is sliding down two metal rails that are inclined 42 degrees to the horizontal. The rails are connected at the bottom so that the metal rod and rails form a loop that has a resistance of 52 ohm. There is a 2.0 T vertical

asked by LS on December 6, 2014
9. ## Algebra

You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9%

asked by Kimberly on December 15, 2011
10. ## Algebra

You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9%

asked by Kimberly on December 15, 2011
11. ## Math 141

You find that a small business loan in the amount of 50,000 is the amount you need to purchase the restaurant location. After researching banks to find the best interest rate, you find that banks for small businesses offer the best interest rate of 9%

asked by Sherry on March 27, 2012
12. ## Math

option 1: 2-by-3, 3-by-4, and 4-by-5 option 2: 2-by-2 , 3-by-3 ,and 4-by-4 option 3: 3-by-5 , 3-by-6 , and 3-by-7 For each pyramid option, calculate the total number of shoeboxes used after each row has been completed. That is calculate the total number of

asked by Pie on October 15, 2013
13. ## english

are both of these a compound or simple sentences I need to have these as a model for the other one's. 1. Her mother went to trade show, but doreen stayed home. 2. Wang and his brother looked at the problem and spotted the solution. i think: 1. compound

asked by liz on October 30, 2006
14. ## physics

Hi can someone please explain to me how to get the answers to the following questions. It would be greatly appreciated A pair of horizontal parallel plates are placed a small distance, 4.00 mm, apart in air. Each plate is rectangular with a width of 20.0

asked by Jessica on April 28, 2010
15. ## chem

What volume of a 0.2 N NaoH solution do you expect to use in order to titrate 25ml (sample out of 250ml) of a 0.200 N oxalic acid solution? heeeelp! Equation is H2C2O4 + 2NaOH==> 2H2O + Na2C2O4 I assume that is 25.00 mL H2C2O4. milliequivalents(meq) NaOH =

asked by Melba on September 26, 2006
16. ## Algebra

A physics student stands at the top of a hill that has an elevation of 37 meters. He throws a rock and it goes up into the air and then falls back past him and lands on the ground below. The path of the rock can be modeled by the equation y = -0.02x^2 +

asked by Mathew on November 30, 2016
17. ## AP Chemistry

These are some lab questions from the following lab: Vapor Pressure and Enthalpy of Vaporization of Water 1. Why does vapor pressure change with temperature? 2. The assumption was made that the vapor pressure of water is negligible at a temperature close

asked by anonymous on January 28, 2007

For the problems below, I have the answers written but from questions d-i, I don't understand how they got the answer. I tried doing it and somehow I messed up with the formula with 3/2 and 5/2 so please show work on how they got the answers for d-i. In

asked by JJ on February 28, 2012
19. ## Chemistry

I just wanted to see if my answers made sense. 1. What effect would each of the following have on your calculated value of Kf (too high, too low, or no effect)? In each case explain your answer. a) There was a small bubble in the thermometer, causing all

asked by Jason on June 2, 2013

S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Annabelle on October 31, 2010
21. ## College (Enthalpy) - College

S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Lucy on October 31, 2010
22. ## Chemistry-College

S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for

asked by Lucy on October 31, 2010
23. ## Math

1. Write the balanced chemical equation for the reaction NaOH + HCI --> NaCI + H20 2. Extract the relevant information from the qustion: NaOH v= 30mL, M=0.10 HCI v= 25.0 mL, M=? 3. Convert to Liters NaOH v= 0.03 L, M= 0.10M HCI v=0.025L, M=? 4. Calculate

asked by Maria on March 8, 2010
24. ## math

A group of people planned to contribute equally towards a water project which needed Ksh 200,000 to complete, however, 40 members of the group without from the project. As a result, each of the remaining members was to contribute Kshs 2,500. (a) Find the

asked by kudu on February 21, 2015
25. ## physics

Traumatic brain injury such as concussionn results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s^2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s^2

asked by mb on September 18, 2008
26. ## physics

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting

asked by shahi on September 22, 2011
27. ## physics

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting

asked by greg on September 19, 2010
28. ## chemistry stoichiometry

My chem teacher gave us this problem Twelve-gauge copper wire,like the kind commonly used in residential electrical systems, is roughly cylindrical and has a diameter of approximately .1040in. Copper's density is 8.92g/cubic cm and copper atoms have an

asked by Julissa on September 9, 2007
29. ## Chemistry

Calculate partial pressure given ka1, pH and KH The equation given in the question was: HCO3-(aq)+H3O+(aq)= CO2(aq)+H2O Calculate the partial pressure of CO2. I think you use : [H3O+] = ka1x(antilog pH)/(antilog pH) Then Henrys law: Equilibrium

asked by Seth on December 10, 2016
30. ## ap chemistry

The weak acid HQ has pKa of 4.89. 1)Calculate the [H3O+] of .035 M HQ. 2)Calculate the (OH-) of 0.500 M HQ ....Am I correct? a) pKa = 4.89 => - log(Ka) = 4.89 => Ka = antilog(- 4.89) = 10-4.89 = 1.29x10-5 1. Given concentration of HQ, C = 0.035 M

asked by patrick on October 4, 2015
31. ## Chemistry

Hi, could someone please take a look at my solution to this problem and let me know if it's correct? I would really appreciate some help. Calculate the theoretical yield for K3[Fe(C2O4)3]*3H2O; 491.258 g/mol Mass of Ferrous Ammonium Sulfate Hexahyrdreate:

asked by Constantine on March 25, 2013
32. ## Physics

A 35 kg box rest in the bed of a truck. The coefficient of static friction between the box and the truck bed is 0.30 and the coefficient of friction of kinetic friction is 0.10. A) Calculate the maximum acceleration the truck can have before the box slides

asked by Sammy on October 27, 2012
33. ## Math

A solid S is made up of a cylindrical part and conical part. The height of the Soild is 4.5m. The common radius of the cylindrical part and the conical part is 0.9m. The height of the conical part is 1.4m. a. Calculate the volume,correct to 1 decimal

asked by Kd on September 4, 2018
34. ## Physics urgent help please

A rectangular coil 60mm × 40mm with 25 turns is positioned with its longer sides parallel to a long straight vertical wire carrying a current of 6.8A. The coil is placed so that its long sides and the vertical wire are in the same vertical plane, with the

asked by Katherine .Mk on January 30, 2017
35. ## Grammar

Circle the nouns that can be used with the adjectives on the right , Development-environment-figures. (Recent) Answer:development and environment Crisis-supply-estimates. (Reliable) Answer:supply and estimates Awareness-theory-concern. (Public)

asked by Maryam on June 6, 2013
36. ## Chemistry

#3 a)What is the pH when 1.25L of a 0.200 M solution of the strong electrolyte NaH2PO4 is mixed with 1.00 L of a .150M solution of the strong electrolyte Na2HPO4? b)What is the pH if the volume of the solution in problem #3a is doubled? c) What is the pH

asked by Aletha on April 1, 2007
37. ## chemistry

The percent composition of iron in a sample of steel can be determined by dissolving a sample of steel in concentrated acid. The resulting solution is then titrated with a permanganate solution. When all of the iron has reacted with the permanganate, the

asked by manny on August 19, 2007
38. ## Chemistry

A 50.0 −mL sample of 1.50×10−2 M Na2SO4(aq) is added to 50.0 mL of 1.23×10−2 M Ca(NO3)2(aq). What percentage of the Ca2+ remains unprecipitated? Calculate the moles of Ca(NO3)2 you have (concentration * volume in L). Moles of Ca(NO3)2 = moles of

asked by K on March 31, 2018
39. ## Physics

Human feet and legs store elastic energy when walking or running. They are not nearly as efficient at doing so as kangaroo legs, but the effect is significant nonetheless. If not for the storage of elastic energy, a 70.0-kg man running at 4.00 m/s would

asked by Shannon on September 30, 2014
40. ## Math

What is the surface area of a rectangular prism with l = 14 in., w = 12 in., and h = 4 in.? * Show your work and solution below. I don't know how to solve this please help ASAP!

asked by Aaliyah M on March 18, 2016
41. ## chemistry

You have 67.0 mL of a 0.400 M stock solution that must be diluted to 0.100 M. Assuming the volumes are additive, how much water should you add?

asked by lee on April 17, 2013
42. ## chemistry

How many grams of water are required to dissolve 27.8g of NH4(NO3)(MM=80.05 g/mol)to make a 0.500M solution?

asked by Carrie on March 4, 2012
43. ## Chemistry

Minimum elevation in boiling point is given by a solution of 1. 0.1M Urea 2. 0.1 NaCL 3. 0.1 Mgcl2 4. 0.1M AL2(So4)3

asked by Raghavendra on April 10, 2014
44. ## ap chemistry

what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.

asked by brian on October 15, 2010
45. ## Chemistry

Why is a dilute solution of boric acid H3BO3 used as an eyewash? How does it work in cleansing the eye from chemicals?

asked by Jonah on March 20, 2013
46. ## goverment

Do you think that the compromise creating a two-house chamber to balance the needs of smaller and larger states was the best solution? Explain.

asked by jimm on March 26, 2015
47. ## Chemistry

asked by Anon on November 20, 2013
48. ## math c30

Solve cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 exact answers and formula for general solution

asked by don on November 5, 2011
49. ## science

why potassium stock with 10000mg/L is added to the sodium standard solution with 20mg/L during the preparation for aas?

asked by saymyname on July 27, 2011
50. ## chemistry

What is the molality of a solution composed of 2.55g of acetone (CH3)2CO, dissolved in 200.g of water?

asked by punk480 on June 15, 2012
51. ## math

oh, please help me post a linear programming questiion with solution(graphical)please i need it nao..and i cant find it on the internet thx

asked by hello on June 21, 2009
52. ## Physical Science

How much Cerium sulfate is needed to make a saturated solution in 100mL of water at 30 degrees Celsius?

asked by Mal on November 8, 2016
53. ## OPERATIOnS RESEARCH

Obtain an initial and optimum solution to the following transportation problem using Vogel’s Approximation method. To Available 7 3 2 2 2 1 3 3 3 4 6 5 Demand 4 1 5

asked by selvi on June 28, 2010
54. ## Calculus

(b) Find a solution of the initial-value problem. (Hint: First verify that all members of the family y = 4/x + C are solutions of the given equation.) y' = −1/4y^2 y(0) = 0.25

asked by Kaitlyn on March 16, 2016
55. ## Chemistry

When the equation for the following reaction in basic solution is balance, what is the sum of the coefficients? MnO2 + HO2^1-.....>MnO4^1- A=11 B=31 C=14 D=9

asked by Wube on April 28, 2012
56. ## Chemistry

If vinegar sample #1 requires 29.05 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?

57. ## Ochem

What volume of 6.83% (wt./vol.) NaOCl solution is required to oxidize 223 mg of 9-fluorenol to 9-fluorenone? Please help me set this up!

asked by Darby on February 1, 2012
58. ## Chemistry

We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given. Do they react at 1:1 ratio? What would be the products?

asked by Beth on July 19, 2017
59. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
60. ## Linear Equations

Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. 10x - y = 12.5 3x + y = 7

asked by Wayne on May 24, 2011
61. ## chemistry

Fe3+ (aq), Ca2+ (aq) and Ba2+ are all present in the same solution. Fully describe a procedure whereby you could separate these ions from one another

asked by Kali on November 7, 2011
62. ## chemistry

How many grams of sodium chloride are needed to prepare a 0.400m NaCl solution that contains 750g of water?

asked by ANA on February 3, 2011
63. ## Chemistry

what is the pH of a solution prepared by adding 0.259g of ammonium chloride to 115mL of water? Kb of NH3 is 1.8x10^-5

asked by Jill on March 22, 2013
64. ## Chemistry

You bubble ammonia in sulfuric acid solution. What is the result? (hint: remember, you start from NH3 (g))

asked by Anonymous on November 16, 2010
65. ## chemistry

What volume of 0.010M silver nitrate will exactly react with 20ml of 0.0080M socium chloride solution?

asked by bliss on January 26, 2013
66. ## Math

Determine which ordered pair is a solution of y = -5x + 10. A. (-15, 5) B. (2, 0)•• C. (-1, -5) D. (3, 25) Find the slope of the line through (-9, 10) and (-2, -5). A. -5/7 B. 7/5 C. 5/7 D. -7/5 If so can someone please describe how to get awnsers I

asked by Memed on April 9, 2018
67. ## Gaussian Elimination Method

Is my answer correct? Write the system of equations as an augmented matrix. Then solve for x and y. −4x−y=6 12x-2y=-8 Solution = -1,-2

asked by plummer on November 23, 2016
68. ## Chemistry

What volume of 0.5M HNO3 is required to neutralize 25 cm3 of a 0.2M NaOH solution? please show work and detail.

asked by Paige on January 15, 2009
69. ## Chemisty

Nitric acid is abailable commercially at a concentration of 16M. What volume would you use to prepare 750 ml of a 0.20 M solution?

asked by Julie on November 17, 2010
70. ## Chemistry

What is the period 6 element that forms a 4+ ion with a pseudo-noble gas configuration? How can I find the solution? Thanks

asked by Ceamus Angelina on April 6, 2018
71. ## chemistry

Which of the following when added to water will cause a significant change in the pH of the solution? 1 NH4HSO4 2 (NH4)2SO4 3 Na2SO4 I believe the answer is 1 & 2. is that right.

asked by George2 on May 15, 2010
72. ## science

I feel like this is really simple, but I don't know where to start with this question. Explain how to make 250mL of 20%sucrose solution.

asked by am on September 15, 2012
73. ## chemistry

Give the concentration in meters when 3.51 moles of HNO3 are dissolved in enough water to make 1.2 liters of solution

asked by Evan on March 5, 2012
74. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
75. ## chemistry

How do I solve this? How many grams of solid NaOH are required to prepare 200 mL of a 0.05 M solution? What will be the concentration expressed in % W/V?

asked by stew on February 1, 2008
76. ## chemistry

What is the molality of a solution consisting of 34.0 mL of benzene (C6H6; d = 0.877 g/mL) in 187 mL of hexane (C6H14 ; d = 0.660 g/mL)?

asked by prince flahn on May 2, 2017

Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte

asked by Morgan on December 2, 2014
78. ## chemistry help

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.

asked by kim on May 20, 2009
79. ## chemistry

I need to determine how many grams of Cesium Iodide following solutes would be needed to make 5.00 102 mL of a 0.300 M solution.

asked by Shawn on October 1, 2012
80. ## math

Name the point of intersection for the following system, if it exists. Your answer will be an ordered pair, no solution, or infinitely many solutions. 4x-3y=-3 3x-y=-6

asked by john on May 2, 2012
81. ## maths

find the general solution of the following first order differential equation. dx/dt = t*x + 6*t(exp)-t^2 pls show working

asked by micheal on October 26, 2011
82. ## chemistry

*the molar solubility of BaCo3 in 0.50M Bacl2 solution IS?ksp(1.6*10^-6) I CALCULATED AND GOT 3.2*10^-9 WANT TO MAKE SURE IF IT CORRECT

asked by jessina on March 19, 2014
83. ## maths

please help find the general solution of the following first order differential equation. dx/dt = tx + 6t(exp)-t^2 pls show working

asked by micheal on October 26, 2011
84. ## college algebra

solve the following exponential equation. 7^x=8 a. x= Write in exact solution b. then with that answer move the decimal 3 points over

asked by confused on November 27, 2012
85. ## Chemistry

How many moles of HCl must be added to 100mL of a 0.100 M solution of methylamine (pKb=3.36) to give a buffer having a pH of 10.0?

asked by Joe on April 24, 2011
86. ## chemistry

if 20g of sugar are added to a beaker filled with 200g of water what is the percent composition of the solution ?

asked by Ryan on April 5, 2012
87. ## physics

an object is 25 cm from a concave mirror whose focal length is 50 cm where will the image be located how wil lthe solution be ?

asked by Joy on July 13, 2014
88. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?

asked by Natasha on May 12, 2013
89. ## calculus

Find the domain for the particular solution to the differential equation dy dx equals the quotient of 3 times y and x, with initial condition y(1) = 1.

asked by Bree on May 20, 2016
90. ## math

How many positive integers less than 1020 have all their digits the same? also give the solution kindly,,,,,,,,,and thanx a lot for the last question's answer

asked by jamesbond on May 13, 2013
91. ## Chemistry

Redox Reactions Can anyone help predict the reaction that will take place when Gold is put into a solution of Hydrochloric Acid?

asked by Anonymous on March 1, 2008
92. ## Algebra

Verify the solution by choosing the correct coordinate point whic states 3x-2y=2 5x-5y=10 Answer choices: (0,-1) (-4,-2) (-2,-4) (1,-5) Thanks for the help

asked by Joe on September 19, 2016
93. ## Chemistry

H2S+H2O H3O +HS why THIS BUFFER SOLUTION IS ABLE TO RESIST CHANGE IN PH WHEN SMALL AMOUNTS OF OH ARE ADDED TO IT.

asked by Clare on April 29, 2015

A laboratory assistant needs to prepare 325 mL of 0.110 M CaCl2 solution. How many grams of calcium chloride will she need?

asked by Jasmin on November 9, 2010
95. ## chem help asap

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.

asked by brown on May 28, 2009
96. ## Math

Ues the Gaussian elimination to find complete solution to the equation or show that none exist 5x+12y+z=10 2x+5y+2z=-1 x+2y+-3z=5

asked by Tonya on February 21, 2011
97. ## Chemistry

How many milliliters of a 0.1 M NaOH solution is needed to completely neutralize 1 liter of lemonade containing 25% citric acide

asked by RS High School on November 9, 2010
98. ## Chemistry Molarity

What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

asked by Toni Jones on March 28, 2011
99. ## Chemistry Molarity

What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

asked by Toni Jones on March 28, 2011
100. ## intermediate algebra

solve an inequality and indicate the solution set, in interval notation. i need the steps that way i can study it and try to do the rest on my own. 3x+1>2andx-2

asked by suzy on September 25, 2012