# 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 197
1. ## Chemistry

Calculate the pH of 75 ml of the buffer composed of .1M HC2H3O2 with .2M NaC2H3O2; to which 9.5 ml of .1M HCl is added.

asked by Kelli on February 6, 2013
2. ## physics

ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E

asked by krushidhar on January 6, 2017
3. ## Chemistry

Calculate the volume, in liters, of 5.80×10−3 mol of a gas at 44 ∘C and 0.885 atm .

asked by em on November 7, 2018
4. ## maths

The length of two pendulum is 110 cm and 27.5 cm, calculate the ration of their time periods

asked by manavi on July 18, 2015
5. ## chemistry

calculate the number of oxygen atoms in 49grams of sulfuric acid ?

asked by plzzz find on July 11, 2010
6. ## chemistry

Calculate the number of moles of O2 that can be produced by the decomposition reaction of water

asked by gjf on November 2, 2016
7. ## trigonometry

Calculate the perimeter of the inscribed square given that the radius of the circle is 3 feet.

asked by kimmy on July 6, 2012
8. ## chemistry

λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 6.

9. ## chemistry

Calculate the energy released when 200 g of ethanol are cooled from 30.0 oC to 5.00 oCeased when

asked by Anonymous on July 17, 2010
10. ## Rydberg equation

λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 6.

11. ## statistics

How do you calculate the z-score for a package weighing 29.6 pounds ( round to 2 decimals)?

asked by lina on June 14, 2013
12. ## physics

which formular do to use to calculate distace in newton's law if i have height and angle?

asked by puleng on February 27, 2017
13. ## chem

Calculate the molar mass of K2[Cu(C2O4)2]*2H2O I got 353.81 is this correct ?

asked by anna on January 31, 2009
14. ## Contemporary math

Using the new table factor calculate the compound amount for \$10,000 investment

asked by Nicole on September 26, 2013
15. ## chemistry

calculate [H30+],pH,[OH-] and pOH for .025 M nitric acid (HNO3)??

asked by Anonymous on July 14, 2010
16. ## physic

calculate the electric force between the two charged particles q1=4c and q2=6c the distance between these charges is 9 m

asked by rahul vijay on September 24, 2014
17. ## Chemistry

Calculate the work done when 36.0 g of tin dissolves in excess acid at 1.00 atm and 30.1 C.

asked by Ennaliea on December 19, 2016
18. ## geometry

a square has a diagonal measurement of 8 radical 2 inches. calculate its perimeter.

asked by taylor on January 17, 2011
19. ## Chemistry

Consider the titration of 50.0 mL of 0.20 M NH3 (Kb = 1.8x10^-5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant.

asked by Anonymous on October 7, 2009
20. ## chemistry

Calculate a value for the solubility of (NH4)2C2O4H2O in g/100 cm3 at 298 K

asked by Grace on May 21, 2014
21. ## chem

calculate the number of moles of naI e50.0ml of a 0.400m

asked by hylton on November 25, 2010
22. ## science

calculate the amount of nitrogen required for making 70g of ammonia

asked by vansh on February 21, 2017
23. ## math/trigo

A 22 ft flagpole casts a 62 ft shadow. Calculate the angle of elevation to the sun

asked by Anonymous on January 24, 2016
24. ## Science

how do you calculate the average velocity of a quarter dropped from a tower after 10 seconds?

asked by Layla on October 5, 2008
25. ## chemistry

Calculate the heat change in kilocalories for condensation of 6.5 kg of steam at 100 ∘ C .

asked by Kenneth on March 13, 2019
26. ## chemistry

Calculate the molar solubility of in the following substances. Pure water and 1.5×10−3 K2CrO4

asked by Bob on March 14, 2011
27. ## chemistry

Calculate the Debroglie wavelength of a mass 1.0g traveling at 1.0cm/sec

asked by Aweda on November 5, 2016
28. ## Math calculate depreciation

please explian how to calculate depreciation for federal income taxes what method do I use thanks :)

asked by Anonymous on November 14, 2007
29. ## Chemistry

Calculate the temperature at which k = 2.0 s-1 if k = 10.0 s-1 at 371 K. The activation energy for the reaction is 30.0 kJ mol-1.

asked by Amber on September 6, 2012
30. ## chemistry

how would you calculate the weight of percipitate of AgBr that will dissolve in 400 ml of water?

asked by ashley on July 15, 2010
31. ## chemistry

calculate the solubility of PbI2 in 0.0123M CaI2. Ksp=6.81x10^-9

asked by benji on March 30, 2016
32. ## Chemistry

calculate the heat liberated when 15.0 g glucoseis metabolized to CO2 and H2O

asked by Anonymous on May 14, 2014
33. ## chem

2 HNO3(aq) + Na2CO3(s) 2 NaNO3(aq) + H2O(l) + CO2(g) (a) Calculate H° for this reaction. kJ

asked by mel on November 26, 2007
34. ## chemistry

How to calculate sigma and pi bonds in a molecule?Please explain using suitable examples.

asked by gaurav on May 13, 2015
35. ## IT240

You have been contracted to build a network for a multimedia development firm that currently uses a 10-Mbps Ethernet network. The company requires a high-bandwidth network for the multimedia team, which constantly views and manipulates large files across

asked by Anonymous on May 8, 2010
36. ## Physics

We learned in lecture that the magnetic force on a charge q moving with velocity v in a magnetic field ~B has the form F = q~v × B One important fact about the cross-product is that for two vectors A and B , the following is true A × B = −B × A which

asked by Jess on February 23, 2010
37. ## Chemistry

You are preparing 500 mL of a 0.300 M acetate buffer at pH 4.60 using only sodium acetate, 3.00 M HCl, 3.00 M NaOH, and water. Calculate the quantities needed for each of the following steps in the buffer preparation. 1. Add sodium acetate to ~400 mL of

asked by Unknown on February 28, 2012
38. ## physics

Proponents of astrology claim that the positions of the planets at the time of a baby's birth will affect the life of that person in important ways. Some assert that this effect is due to gravity. Examine this claim with Newton's law of gravity. Calculate

asked by cb on March 15, 2009
39. ## Chemistry

Hello! I am having a little difficulty answering these two questions on my homework, I was wondering if anyone could please help me out! Thank you! 1) Consider the following balanced chemical equation for the neutralization reaction of calcium hydroxide

asked by T.C. on November 30, 2013
40. ## Pre Calculs

The pH of a chemical solution is given by the formula pH = -log10 [H+] where [H+] is the concentration of hydrogen ions in moles per liter. Values of pH range from 0 (acidic) to 14 (alkaline). (a) what is the pH of the solution for which [H+] is 0.1? (b)

asked by Erica on October 10, 2006
41. ## Chemistry

I don't really understand these questions and their processes. And I am a bit iffy on redox reactions. For problem 3, can you show a step by step process how to do the problem? Problem 2, I do not fully understand how to do it at all. How would you know

asked by Mika on April 6, 2014
42. ## ORGANIC CHEMISTRY

NAME THE PROCESSES OR TECHNIQUES IN THE FOLLOWING. 1.SEPARATION OF A SOLID FROM A SOLUTION 2.WHEN WATER IS COLD TO FORM ICE 3.WHEN WATER IS BOIL TO FORM VAPOR 4.WHEN IODINE IS HEATED DIRECTLY TO FORM GAS WITHOUT BEING LIQUID 5.WHEN STEAM IS COLD TO FORM

asked by SAMIRA on February 10, 2012
43. ## Economics

The task of my assignment was to calculate the Nominal GDP, given the GDP deflator and the Real GDP. This is what I got. GDP Deflator Real GDP Nominal GDP 0.9 600 540 1.0 600 600 1.1 600 660 The second part of the question asks what is happening in terms

asked by Freddy on February 7, 2007
44. ## algebra

solve for x (24+2x)(10+2x) - 240 = 152 First multiply. 24(10) = ___ 2x (2x) = ____ Now subtract 240. Can you finish the problem from here? dont i need to put this in equatic equation to solve for x. cause i need to find the width of a small rectangle

asked by q on August 3, 2007
45. ## Physics

1. The Following instruments are available in your laboratory. What would be the absolute uncertainties in the measurements made with these instruments? A. Ruler B. Protractor C. Watch D. Scale 2. By using the instruments from the task 1, you have

asked by Alessandra Romano on September 5, 2015
46. ## Chemistry

Suppose you are given the following experimentally observed facts regarding the reactions of silver ion. (a) Ag^+ reacts with Cl^- to give white AgCl (s) (b) Ag^+ reacts with ammonia to give a quite stable complex ion, Ag(NH3)2^+ (c) a black suspension of

asked by martini on November 29, 2011
47. ## economics

cattle rancher (A) owns a property next to an apple farm (B) cattle sometimes tent to roam into B's land and damage the trees. The rancher can choose the size of the herd. revenue form cattle is \$6 per head. The following schedle lists A's marginal

48. ## math

I know that on this forum you can't graph but can someone help me with where to plot my lines... Here is the question and my solution...(need to shade solution)will draw two lines(solid) and shade below but need to verify line equation points A small

asked by Dori on August 12, 2007
49. ## physics

A particle of mass 0.350 kg is attached to the 100-cm mark of a meter stick of mass 0.175 kg. The meter stick rotates on a frictionless, horizontal table with an angular speed of 6.00 rad/s. (a) Calculate the angular momentum of the system when the stick

asked by Karrine on October 22, 2012
50. ## Chemistry

Magnesia (MgO) is used for fire brick, crucibles, and furnace linings because of its high melting point. It is produced by decomposing magnesite (MgCO3) at around 1200 oC. 1. Calculate the equilibrium pressure of CO2(g) (in atmospheres) above MgCO3(s) at

asked by Kegahn on April 6, 2007
51. ## Dr.Bob222- IChemical formulas&Reactions

When aqueous copper(II)chloride reacts with aqueous ammonium phosphate, soluble ammonium chloride forms and copper(II) phosphate precipitates out of solution. 1. Write the balanced molecular equationfor this reaction. 2. Write the balanced complete ionic

asked by chrissy on January 3, 2007
52. ## Chemistry

Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed. CH3CO2H + ROH CH3CO2R + H2O The reaction is usually carried out in the presence of an acid catalyst. In an experiment to determine Kc a student placed together

asked by Autumn on April 4, 2018
53. ## math

In a factory of electronic items, the total cost of production, expressed in thousands of dollars, is given by the function C(x)= (x^2-x+2)/x+1 where x belongs to [0;5] and expressed in hundrends of items produced. 1) calculate in dollars the total cost of

asked by Jessy on January 1, 2011
54. ## Statistics

Consider the following frequency distribution of daily sales for a shop that was kept for the months of November and December in 2013. Daily Sales (\$) 60-70 70-80 80-90 90-100 100-110 110-120 Number of days 5 11 22 13 7 3 a. From this frequency

asked by Nathan on October 1, 2016
55. ## Bule hora preparatory school

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape

asked by Bilisuma hussein on October 14, 2015
56. ## E.I.S.J

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape

asked by zizo breezy on October 31, 2015
57. ## Physics

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape

asked by Saud on October 15, 2017
58. ## physics

An ideal gas is sealed within a container at a tempreture of 17 degree celcies and a pressure of 101KPa. The container is heated until the tempreture of the gas reaches 100 degree celcies. A valve in the container is then opened to allow gas to escape

asked by medina on November 14, 2018
59. ## chemistry

Here is the question: sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas: NaH(s)+H2O-->NaOH(aq)+H2(g) A sample of NaH weighing ________g will produce 982mL of gas at 28.0 C and 765 torr, when the hydrogen is

asked by Gweedo on June 17, 2009
60. ## chem

a little trouble with these, kindly help please 1) How many grams of vitamin B12 are present in a 100.0 mL blood serum sample with a vitamin B12 concentration of 148 ng/L? A)1.48 x 10-8 g B)1.48 x 10-5 g C)1.48 g D)1.48 x 10-9 g 2)Sodium fluoride is added

asked by topanga on November 17, 2015
61. ## Physics

A thrill-seeking cat with mass 4.00 kg is attached by a harness to an ideal spring of negligible mass and oscillates vertically in SHM. The amplitude is 0.050 m, and at the highest point of the motion the spring has its natural unstretched length.

asked by Alex on November 19, 2012
62. ## Chemistry

Hi, I would like to know if I did this problem correctly. Your help would be greatly appreciated! "Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. The anode reaction is 2Cl-(aq)---> Cl2(g) + 2e- How long will it take

asked by Rachel on April 30, 2007
63. ## MIcroeconomics

Hi. THis is due Tuesday. I am working on it but can use some help. Peggy-Sue has been offered a job by Cookie monster inc for a salary of \$125,000 per year. Currently she is producing her own cookies and she has revenues of \$260,000 per year. Her costs are

asked by Debra on October 19, 2006
64. ## algebra

1. Solve 3x – 19 = 2 Ax = -17 Bx = -17/3 Cx = 7 Dx = -51 Ex = 20 Fx = 18 2. Solve 4x + 12x = 62 + 4(11) Ax = 7 Bx = 5 Cx = 35 Dx = 64 Ex = 11 Fx = 7/2 3. Solve 8x – 7 = x + 10 Ano solution Bx = 1/3 Cx = 1/10 Dx = 3/7 Ex = 17/7 Fx = 17/9 4. Solve 4(5x

asked by whitney on September 20, 2010
65. ## physics

Consider a 20 cm long cylindrical glass of refractive index n=2.0. Left end of it is a concave spherical mirror with radius of curvature 12 cm for an object O inside the cylinder. The shape of the right end of the cylindrical glass is not known. If the

asked by Karaokyanus on October 16, 2011
66. ## science(physics)

A car goes from a dead stop to 25m/s in 5s going east. It keeps going then slows down after it reaches 60m/s. It is being drived on level ground. For the first 5s the magnitude of the velocity vector increases at a constant rate. What is the Instantaneous

asked by ~christina~ on August 1, 2007
67. ## CHEMISTRY

I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O

asked by Allie on February 22, 2016
68. ## STATISTICS

A study was conducted to examine the peer review process. The investigators hypothesized that reviewers suggested by authors would give more favorable reviews than reviewers picked by journal editors. They obtained data on 40 manuscripts that had been

asked by Susie on August 6, 2013
69. ## Chemistry - Vapor Pressure

a.)What is the partial vapor pressure of a benzene above solution obtained by mixing 44.7 g benzene, C6H6, and 77.3 g toluene, C6H5CH3, at 25 ∘C? At 25 ∘C the vapor pressure of C6H6 = 95.1 mmHg; the vapor pressure of C6H5CH3 = 28.4 mmHg. b.)What is the

asked by Anonymous on February 21, 2016
70. ## Financial Accounting

Calculate accounts receivable turnover ratio. Calculate accounts receivable turnover ratio. Selected information from Mystic Corporation’s balance sheet at December 31, 2010 and income statement for the year ended December 31, 2010 is as follows: Cash

asked by Anonymous on May 3, 2013
71. ## Physics/Math

Calculate the ratio of the drag force on a passenger jet flying with a speed of 750 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at one-fifth the speed and half the altitude of the jet. At 10 km the density of air is

asked by COFFEE on February 10, 2007
72. ## Physics

A stone used in the sport of curling has a mass of 20.0 kg and is initially at rest, sitting on a flat ice surface. It is pushed with a constant force of magnitude 25.0N over a distance of 4.00 m. (Assume friction between the stone and the ice is

asked by Jess on December 3, 2018
73. ## chem

Assuming that you have 0.4g of Y(OH)3, calculate the mass of of BaO2 required to react stoichiometrically (1Y:2Ba:3Cu) to produce YBa2Cu3O7. Now calculate the mass of of CuO required to react stoichiometrically (1Y:2Ba:3Cu) to produce YBa2Cu3O7. please

asked by mary on October 26, 2006
74. ## Chemistry

Consider an ideal gas encloesd in a 1.00 L container at an internal pressure of 10.0 atm. Calculate the work, w, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 20.0 L. w = ____ J now calculate the work done if this

asked by Lauren on February 10, 2012
75. ## chem

The mass of the CuSO4 x 5H2O sample is 1.664 g. The mass of the recovered copper is 1.198 g. 1. Compute the experimental percent by mass of copper in the sample: 1.1664/1.998x 100=71.81% 2. Calculate the percent copper in pure copper sulfate

asked by Lou on April 13, 2009
76. ## Chemistry

Write the ionic equation for the reaction of lead 2 nitrate reacting with the acidic solution to form a precipitate

asked by Caro on August 29, 2014
77. ## Chenistry

If 33.7 grams of LiOH dissolve in enough water to make a 231-gram solution, what is the concentration in percent by mass?

asked by ilyrae on March 21, 2011
78. ## Chemistry

What is the pH of a solution that has a concentration of hydronium ions that is 4.7 × 10-4 molar H3O+? Show, or explain, the work used to solve this problem.

asked by Johnny on June 13, 2011
79. ## algebra

|x| + 5 = 18 5 or -5 13 or -13*** |y + 4| < 1 -5 < y < -3 -3 < y < 5***? -4 < y < 1***? 1 < y < 4 |2t| - 5 = 7 t = 1 or -1 t = 6 or -6*** t = 10 or -10 t = 12 or -12 |a| -3/4 = -5/8 1/8 or -1/8 7/8 or -7/8 1 3/8 or -1 3/8 no solution Please help!? Not good

asked by SkatingDJ on October 27, 2014
80. ## Chemistry

If you are asked to make exactly 1.0 Liter of 0.80 M ZnCl2 solution, how many grams of zinc chloride would you need to be massed out? How do I go about solving this problem?

asked by Annie on July 13, 2016

What pH buffer solution is needed to give a Ni2+ concentration of 2.5 x 10-3M in equilibrium with solid nickel hydroxide Ni(OH)2? Ksp = 6.0 x 10-16.

asked by Kate on March 18, 2012
82. ## solid mensuration

Find the area of a segment of a circle whose diameter is 16 cm & the central angle measures 80 degrees. Please include solution. Thanks.

asked by Cathy on December 1, 2012
83. ## Algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 1/5x -1/4 y = 3 2/5x + 1/2y = 2

asked by Kim on March 11, 2010
84. ## Math

Which of the following ordered pairs is a solution of the equation y = -4x². Can someone help me solve it. Could you guys also explain why that answer is. Here are the options/Answers: (-2,16) (1, -8) (0,-4) (2,-16

asked by -_- on March 26, 2019
85. ## calculus

Find the solution of the differential equation that satisfies the given initial condition. dp/dt=2 sqrt(pt), P(1)=5 my answer: P=(2/3t^(3/2)+(15sqrt(5)-10)/15)^2 how is it wrong?

asked by kyle on March 20, 2016
86. ## chemistry

when 12.5mL of 0.28M HNO3 and 5.0mL OF 0.46M Ba(OH)2 are mixed, is the resulting solution acidic, basic, or neutral?

asked by Jon on March 13, 2011
87. ## Algebra

m+3 over 3m, divided by 6m over m+3 Would the solution be 1 over 18m? It doesn't seem right to me; I canceled out the two "m+3"'s before I changed the sign to multiplication and created a reciprocal of the second term..

asked by Anonymous on September 23, 2009
88. ## math

formulate problem and solution Given: Time taken by light to travel 1 meter is roughly 3×10 raise to negative 8 seconds

asked by Anonymous on September 30, 2016
89. ## Chemistry

How much water must be added to 482. mL of 0.201 M HCl to produce a 0.147 M solution? (Assume that the volumes are additive.)

asked by Lailah on December 2, 2012
90. ## Algebra 1

factor trinomial completely of the type ax^2+bx+c. -9+18x^2+21x I am not able to solve the solution since the steps are quite confusing any help is great.

asked by Claritza on March 30, 2016
91. ## physics

a ball is thrown from level ground at 24 m/s, 30 degree above horizontal. How much time will it take to reach its maximum height? solution

asked by tns on March 1, 2012
92. ## Algebra 1-HELP!

factor trinomial completely of the type ax^2+bx+c. -9+18x^2+21x I am not able to solve the solution since the steps are quite confusing any help is great

asked by Claritza on March 30, 2016
93. ## chemistry

a saturated solution of potassium chloride prepared at 60degree celsius is allowed to cool at room remperature

asked by jasper on October 12, 2014
94. ## chemistry

what is the procedure for determining the boiling point of 1 M solution of sugar,urea,glucose,NaCl,BaCl2,AlCl3

asked by mrunal on November 5, 2014
95. ## Chemistry

In basic solution disproportionate to bromited bromide ions. Use the half reaction method to balance the equation.

asked by Praise on May 18, 2013
96. ## Science

A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius? ????????

asked by Anonymous on September 17, 2016
97. ## Science Chemistry

A saturated solution of kcl is prepared at 25degree celsius. What would happen if temperature is cooled to 10degree celcius?

asked by Jim on September 17, 2016
98. ## AP Chemistry

What volume of water was added to the 350 mL of NaOH solution? Assume volumes are additive. Answer in units of mL

asked by Gabriella on September 11, 2013
99. ## chemistry

How many grams of hydrogen peroxide (H2O2) must be added to 1,500 mL of water to produce a concentration of 1.33 m (molal solution)?

asked by Anonymous on July 8, 2013
100. ## math

i am stuck on this problem! help! Write a quadratic equation that has two solution, 4 and -4. Leave the polynomial in reduced factored form.

asked by mariana on August 6, 2013