# 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 149
1. ## math

the solution is (2/3,-1/2)(-3,-8) and he formula is f(x)=mx+b given the slope and one point

asked by valentine on August 5, 2014
2. ## Chemistry

How many grams of drug X are in 10 mL of a 1:200 solution of X?

asked by James on October 23, 2015
3. ## Chemistry

If you had .1 ml in a 1M solution of HCl how much water would you need to dilute it to a pH of 7?

asked by Sabrina on April 11, 2016
4. ## College Chemistry

Determine the pH of a solution that contains 5.3*10^-2 M in HClO4 and 3.0*10^-2 M in HCl?

asked by Mickey on February 26, 2011
5. ## chemistry

What would be the pH of 0.568 g of HClO4 per 250 mL of solution?

asked by Vaneza ASAP on February 26, 2011
6. ## chemistry

what is the pH of .001M solution of acid (pKa=3)

asked by brandy on October 21, 2015
7. ## Economics

Can anyone walk me through the solution of this problem? 1/2(1600/E)^1/2*50=? Thank You

asked by Math on February 14, 2018
8. ## math

Which ordered pair is a solution to the equation y = 13 ‒ x?

asked by james on October 25, 2017
9. ## math-differential equations

hi i need to know how to do this one thanks Find the solution to yx + x + (dy/dx) = 0 ; y(9) = -9 y = ???? Does this separate the variables? dy/dx=-x(y+1) dy/(y+1) = -x dx

asked by kayla on August 5, 2007
10. ## Algebra 1

What is the solution to the system y=10x-3 y=-7x+3 answers from 5/17, 16/17 4/17, 16/19 -5/17, 16/17 3/17, 5/17

asked by Steve on December 30, 2014
11. ## Math

Which ordered pair is a solution of the equation: y= -9x + 4 A (10,-86) B (-4,-58) C (6,-41) D (-6, 57)

12. ## Math

Is (0,2) a orderd pair a solution of 4x - 3y = 6? Explain.

asked by Liz on February 7, 2011
13. ## Order Pairs Math

Which ordered pair is a solution of the equation y = x – 3? (–2, 5) (–5, 2) (2, 5) (5, 2) Which ordered pair is a solution of the equation y = 5x? (–2, 10) (–5, 25) (–3, 15) (–2, –10) Which ordered pair is a solution of the equation y =

asked by Jman on September 13, 2013
14. ## algabra

Solve and graph the solution set.

asked by edie on August 19, 2007
15. ## Trigonometry

Solution set of sin 2x = -1/2 in [0,2pi)

asked by Name on November 12, 2017
16. ## chemistry

How many moles of Na2CO3 are teher in 5.oL of 2.0 M solution?

asked by remie on September 17, 2013
17. ## Science

0.02mole of the HCL and in 2leter of the pH solution

asked by Anonymous on August 20, 2018
18. ## Precalculus

Is this correct? 1. Find the solution set for x^2/(x+3) < 9/(x+3). x^2/(x+3) < 9/(x+3) x^2 < 9 x^2 - 9 < 0 (x-3)(x+3)

asked by Anon on January 10, 2012
19. ## algebra

Find the smaller solution for 4x2 − 78 = 2

asked by uriel on February 12, 2011
20. ## Algebra

Is (1, -4) a solution for the equation y = -2x? My answer is 1 = 2 (-4) 1 = -8 No it isn't

asked by Julie on August 27, 2014
21. ## chemistry

difference between solution and pure substance

asked by Anonymous on February 21, 2013
22. ## Algebra

Solve the equation, if possible(answer or no solution); n-10=5/6n-7-1/3n

asked by Anonymous on September 15, 2013
23. ## Chemistry

what is the pH solution in which 15 mL of 0.10 M NaOH has been added to 25 mL of 0.10 M HCl

asked by Veronica on June 10, 2014
24. ## math

Find the solution x of the following equation : 12X =32.

asked by gary on February 26, 2013
25. ## chemistry

How many grams of NaOH are there in 2.5L of a 0.343M solution?

asked by twynna on February 13, 2011
26. ## Algebra 1

Which ordered pair is a solution of the inequality? y>= 4x-5 3,4 2,1 3,0 1,1

asked by Steve on December 21, 2014
27. ## Mathhhhh helpppp

Which ordered pair is a solution of the equation y=x-4? a. (2,6) b. (6,2) c. (-2,6) d. (3,1)

asked by Haley on November 16, 2017
28. ## algebra

50-word response to the following: How do you know when an equation has no solution?

asked by kathy on February 8, 2011
29. ## algebra

which ordered pair is a solution to the equation y=-5x+4 A.(2,14) B.(5,-29) C.(3,-19) D.(5,-21)

asked by Jojo on November 9, 2017
30. ## math

What is the solution to (4 x 10^3) x (6 x 10^6), written in scientific notation?

asked by Mep on October 31, 2017
31. ## MATH

Identify the solution(s) of the system of equations, if any. a) (1, 0.5) b) (0, 5.1) c) (5,5.5) d) (5/11, -2/11)

asked by Anonymous on January 31, 2013
32. ## chemistry

What is the concentration of a 1:2 dilution of a 0.6 M NaHCO3 solution?

asked by Janassa on June 26, 2014
33. ## math

Identify the solution(s) of the system of equations, if any. 3x + 2y = 4 5x - 4y = 3 a) (1, 0.5) b) (0, 5.1) c) (5,5.5) d) (5/11, -2/11)

asked by Anonymous on January 31, 2013
34. ## MATH

Decide if the given number is a solution to the given equation. 24/X = 2; 3

asked by Matt 2000 on November 23, 2009
35. ## Chemistry

300 ml of a 0.5NKOH solution, how can it be neutralized

asked by willie on July 13, 2011
36. ## algebra math 208

determine if the given number is a solution to the equation 6, -x + 12 =6

asked by Anita fields on July 30, 2010
37. ## math

Evaluate:24(12)-9/3. Find the answer and the solution.

asked by Erica Anne C. Arellano on July 25, 2011
38. ## science

What can particles in solution NOT do because ther are so small

asked by Katherine on November 17, 2009
39. ## Chemistry

The pH of a .200M HBrO solution is 4.67. What is the acids Ka?

asked by Shayla on May 9, 2014
40. ## Algebra

How do you find a quadratic equation if you are only given the solution?

asked by Anonymous on June 2, 2010
41. ## Math

Find the solution to each equation. 2^x=17 4log4^(x)=7

asked by Nicole on May 19, 2016
42. ## Chemistry

The pH of a solution halfway to the equivalence point

asked by Anonymous on November 8, 2017
43. ## chemistry

How many grams of NaOH are there in 2.5L of a 0.343M solution?

asked by twynna on February 9, 2011
44. ## algebra

Determine the orderd pair is a solution y=x + 2/7 A.(0,0) B.(-1,2/5) C.(1,2/5)*** D.(2,2 2/5)

asked by Jojo on November 6, 2017
45. ## science

1 what is mean by hypertonic, isotonic and hypotonic solution.

asked by sangam on June 26, 2008

HOW WOULD YOU PREPARE ML OF A 0.250M SOLUTION OF Ca(NO3)2?

asked by PORSHA on February 8, 2011
47. ## Physics

A 21.1 g ball of clay is thrown horizontally at + 38.7 m/s toward a 1.2 kg block sitting at rest on a frictionless surface. The clay hits and sticks to the block. A. What is the speed of the block and clay right after the collision? m/s B. Use the block's

asked by Courtney on November 7, 2012
48. ## chemistry

a fire extignuisher produces carbon dioxide by the reaction between sodium hydrocarbonate and sulfuric acid. if a fire extinguisher is desgined to hold 600.0g of sodium hydrocarbonate calculate : the mass of sulfuric acid required to react with sodium

asked by sarah on April 17, 2010
49. ## Physics

Block A of mass 4.0 kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible mass and spring constant 650 N m. The other end of the spring is attached to a wall. The block is pushed toward the wall until the spring has been

asked by Joe on September 19, 2010
50. ## Substitution Method in Algebra!HELP PLZ!

Use the Substitution method to solve the system of equations. 3x + y = 5 4x - 7y = -10 multiply first equation by 4 multiply second equation by 3 thus both equations have same x or y value in this case it is the x value. 12x + 4y = 20 12x - 21y = -30 solve

asked by Matthew on November 5, 2006
51. ## Chemistry Lab

Are you titrating? Qualitative testing? Just what? If the copper is in solution you can filter the ppt (or let the ppt settle and decant some of the supernatant liquid) and to the filtrate or the decanted liquid add some more NaOH to see if additional ppt

asked by Joe on October 9, 2008
52. ## Algebra 1 (Reiny)

1. It takes Dustin 2 hours to shovel the snow from his driveway and sidewalk. It takes his sister 3 hours to shovel the same area. How long will it take them to shovel the walk if they work together? A: Working together, Dustin and his sister can shovel

asked by Victoria on June 3, 2014
53. ## chemistry

There are four main methods of making salts: Acid + Metal, Acid + insoluble base, Acid + alkali and solution of salt A + solution of salt B. a. a student wanted to make some sodium sulfate. i. which method would be best to use? ii. why? iii. which

asked by Chloe on April 6, 2008
54. ## Chemistry

NH3 + Pb(NO3)2 -> How can I find the product and the net ionic equation? I suspect this is in a water solution, so the lead nitrate is in solution, but NH3 will react with the water to form ammonium ions, and hydroxide ions. The lead ions will react with

asked by Anonymous on October 21, 2006
55. ## oxidation

In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water, the oxidizing agent is... ? Fe(II) ==> Fe(III) H2O2 ==> H2O. Fe goes from +2 to +3, that is a loss of electrons, so it is oxidized (by definition,

asked by Christine on April 19, 2007
56. ## math

using problem 17-21 calculate the first 2 years depreciation assuming the units of production method. this machine is expceted to produce 120,000 units. in year 1 it produced 19,000 units and in year 2 38,000 units problem 17-21 Jim company bought a

asked by Anonymous on November 17, 2011
57. ## math

using problem 17-21 calculate the first 2 years depreciation assuming the units of production method. this machine is expceted to produce 120,000 units. in year 1 it produced 19,000 units and in year 2 38,000 units problem 17-21 Jim company bought a

asked by Anonymous on November 14, 2011
58. ## finite math

kris scored 630 points on a particular section of a CPA exam for which the score were normally distributed with a mean of 600 points and a standard deviation of 75 points. At a differenttime, kerry scored 540 points on the same section, for which scores

asked by margie on April 14, 2011
59. ## Physics

A block of mass m1 is connected to an empty bucket of mass 1.35 kg by a cord over a frictionless pulley. The coefficient of the static friction between the table and the block is 0.45 and the coefficient of kinetic friction between the table and the block

asked by Mawuli on May 2, 2011
60. ## mechanical properties of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

asked by dmkp on February 9, 2013
61. ## mechanics of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

asked by dmkp on February 10, 2013
62. ## mechanics of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

asked by dmkp on February 9, 2013
63. ## mechanics of materials

A cylindrical tank with flat endplates is constructed from two sections that are welded together circumferentially.The outer diameter of the tank is 1.20, and the wall of the tank is 20.0 mm thick and the mamimum internal pressure is 2.00 MPa. (a)

asked by dmkp on February 9, 2013
64. ## Decolorizing

Question: A compound you have prepared is reported in the literature to have a pale yellow color. When the substance is dissolved in hot solvent to purify it by crystallization, the resulting solution is yellow. Should you use decolorizing charcoal before

asked by Sheryl on September 27, 2006
65. ## Algebra 1--Please, help me!

1. It takes Dustin 2 hours to shovel the snow from his driveway and sidewalk. It takes his sister 3 hours to shovel the same area. How long will it take them to shovel the walk if they work together? A: Working together, Dustin and his sister can shovel

asked by Victoria on June 3, 2014
66. ## physics

A space habitat for a long space voyage consists of two cabins each connected by a cable to a central hub as shown in the figure below. The cabins are set spinning around the hub axis, which is connected to the rest of the spacecraft to generate artificial

asked by Anonymous on November 8, 2010
67. ## AP Bio

Transpiration Lab- I need to calculate the rate for each of the treatments. Here is the data These are the results of an experiment that was done you need to graph the results and answer the questions. Class Average Cumulative Water Loss in ml/m2 Time

asked by Jane on April 6, 2009
68. ## sciecne

An airplane is being floen at 1500km/h at 100m above level ground. The ground began to rise up at 10 degrees. How much time does the pilot have to madke correction such that the plane doesn't hit the ground? the part where the ground is rised to 10 degrees

asked by Christina on September 19, 2006

At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the

asked by keisha on September 29, 2013
70. ## Chemistry

A .682 g sample of an unknown weak monoprotic acid, HA, was dissolved in sufficient water to make 50mL of solution and was titrated with a .135 M NaOH solution. After the addition of 10.6mL of base, a pH of 5.65 was recorded. The equivalence point was

asked by Sara on May 9, 2007
71. ## Chemistry

We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true

asked by Alex on October 14, 2015
72. ## Chemistry

We did a titration lab, and one of the post-lab questions says: "the manufacturer of the vinegar used in this experiment claims that the vinegar contains 5% acetic acid by weight. Use your results and a density of 1g/mL to determine if this claim is true

asked by Alexandra on October 14, 2015
73. ## chemistry

I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final

asked by xx on November 22, 2014
74. ## chemistry

I have to calculate the ΔV= final volume-initial volume For the first trial the final volume was .005mL the initial volume was .03mL, which equaled to -.025mL. The volume was negative because it was exothermic reaction. For the second trial the final

asked by xx on November 23, 2014
75. ## Chemistry

In each of the following groups, identify the two substances whose aqueous solutions have common properties to a marked degree by circling the two formulas. Explain why you made your choice. I'm not the two formulas I circle is correct. Below are my

asked by Anonymous on June 30, 2008
76. ## chemistry

530 mL solution 10% HCl has been spilt onto the bench. It cannot be diluted or washed away. How much of the granular NaOH from the container seen in a must be used to neutralise the acid? [Using NaOH: MM = 40 g/mol] 1. I have NaOH + HCl --> NaCl + H2O. 10%

asked by Anonymous on October 2, 2014
77. ## calculus

I have the following problem on a takehome assignment and am stuck. A particular stock has value V(t) at time t where V(t)=Ke^(1/2) where K>0. Assume that alternative investments grow in value to e^(rt). Calculate the instantaneous rate of change in the

asked by Rey on March 16, 2008
78. ## Chemistry

An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq)  C4H9OH(l) + Br-(aq) This reaction was investigated experimentally

asked by turner on April 3, 2012
79. ## maths

Mr. Jones bought a stove at a discount of 20%. The price of the stove is \$4,000. a)Calculate the discount in dollars. b)What was the cost of the stove after the discount? c)Mr. Jones paid VAT of 12 1/2% on the discounted price. How much VAT did she pay?

asked by indira on May 5, 2017
80. ## math

A 200g alloy is made of copper and zinc. the number of copper atoms is 3 times that of zinc, a)calculate the number of copper and zinc atoms. b)calculate the weight of copper and zinc in the alloy. so for a) can i assume that the mol ratio is cu:zn = 3:1?

asked by nelson on April 28, 2017
81. ## Chemistry

Calculations involving a limiting reactant Now consider a situation in which 20.0 g of P4 is added to 54.0 g of Cl2, and a chemical reaction occurs. To identify the limiting reactant, you will need to perform two separate calculations: 1) Calculate the

asked by Beth on October 17, 2016
82. ## physics

Two cars A & B are coming closer to one another with speed 36 km/h and 72 km/h Separated by a distance 1500 m calculate : 1 . time interval after which two car meet . 2 . if acceleration of car A is 2m/s2 then calculate time interval after which car A & B

asked by Anonymous on September 14, 2014
83. ## math

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter your answer with the correct number of significant figures. 885.75 g + 10.151 g - 25.50 g Calculate the value of the

asked by help? on September 23, 2010
84. ## Physics

A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north.

asked by Anonymous on February 12, 2016
85. ## PHYSIC

A ferryboat transports tourists among three islands. It sails from the first island to the second island, 4.38 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 76.5° west of north.

asked by help on February 12, 2016
86. ## physics

A copper calorimeter of mass ()g contains 380g of a liquid at 12degrees Celsius. A 20W heater is used for 3 minutes to raise the temperature of the liquid and calorimeter to 17 degrees Celsius. The calorimeter has a specific heat capacity of 400 J/K kg

asked by Matteo on March 22, 2012
87. ## Chemistry

Hi everyone, I have been trying to figure out this titration equation all day and for some reason I am stumped. Here is the question in full: Potassium hydrogen phthalate, KHP, can be obtained in high purity and is used to determine the concentrations of

asked by jo on November 29, 2012
88. ## chemistry

An indicator has the reaction Hln(aq) ¡ê H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there

asked by Anonymous on May 4, 2012
89. ## chemistry

An indicator has the reaction Hln(aq) ↔ H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there

asked by Anonymous on April 23, 2012
90. ## Algebra

Please help to find x, y 1. 8x-y=17 6x+y=11 2. 5x-2y=17 2x+3y=3 Question no.1 8x-y=17 6x+y=11 (adding the equation) __________ (-y and +y will be 0) 14x =28 Taking variables to one side x=28 __ 14 14*2=28 therefore x=2 substitute this value of x in

asked by Tamia on May 18, 2007
91. ## SCIENCE: GR.10 OPTICS CONVEX MIRRORS

A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height. AND An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm.

asked by lily on March 28, 2010
92. ## Chemistry

Hi, we have done an experiment in class where we have an equalibrium between (Co(H2O)6)^+2 + 4Cl^- (CoCl4)^-2 + 6H2O where we added HCl dropwise until a colour change occured which changed the solution into a dark blue as the concentration of the Cholride

asked by Ivan on January 20, 2016
93. ## Chemistry

Hi was looking to get some help with an experiment. Currently I trying to determine the amount iron in cereal. And was hoping to get some help with one of the questions I have been given. First off I am the recorded absorbance across the region 470 – 490

asked by Josh on October 14, 2014
94. ## Chemistry (Aspirin Synthesis- Unreacted SA

To determine the yield of your ASA synthesis, you can quantify the amount of unreacted SA Weigh out 0.15 g of your crude ASA into a clean tared 7 mL vial. Record exact mass. 2) Add 5 mL ethanol. 3) Cap vial and mix well. 4) Transfer the above solution into

asked by Maxine on March 23, 2015
95. ## math

You randomly choose 16 unfurnished one-bedroom apartments from a large number of advertisements in your local newspaper. You calculate that their mean monthly rent is \$613 and their standard deviation is \$96. Does this SRS give good reason to believe that

asked by arshi on November 19, 2013
96. ## Chemistry

Calculate the final concentration for the standardization of KMnO4 given this information: 2MnO4- + 5C2O4^-2 + 16H+ -> 2Mn^2+ + 10CO2 + 8H2O [final redox equation] Volume of KMnO4 titrated with H2SO4 + Na2C2O4 = 293 mL Volume KMnO4 titrated with H2SO4

asked by Katherine on May 2, 2012
97. ## Physics

An ideal gas is sealed within a container at a temperature of 17°C and a pressure of 101 kPa. The container is heated until the temperature of the gas reaches100°C. A valve in the container is then opened to allow gas to escape until the pressure falls

asked by Buma on November 11, 2017
98. ## Physics

An ideal gas is sealed within a container at a temperature of 17°C and a pressure of 101 kPa. The container is heated until the temperature of the gas reaches100°C. A valve in the container is then opened to allow gas to escape until the pressure falls

asked by Buma on November 11, 2017
99. ## Physics

The particles as shown in the figure below are connected by a very light rod. They rotate about the y axis at 1.9 rad/s. a. Find the speed of each particle, and use it to calculate the kinetic energy of this system directly from 1/2 mivi2. speed of m1 = 1