# 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 302
1. ## Physics

2. One +1.0 C (one coulomb) charge and another -1.0 C charge are located 1.0 m apart. a. Calculate the magnitude of the electric force between them. b. In what direction does the force act?

asked by Akhmed on May 30, 2018
2. ## physic

Calculate the average angular velocity and the average linear velocity of the tip of a 10 cm long second- hand of a watch.

asked by Intakhab on October 25, 2017
3. ## chem 100 electrochemisty

Calculate the standard reduction potential for the reaction that coverts Cu3+ to Cu2+. Cu3+ + 2e-> Cu+ E0 =1.28 V Cu2+ + e-> Cu+ E0 = 0.15V

asked by Mall on May 9, 2015
4. ## Math

An arc of a circle subtends an angle of 54 at the centre. If the arc is 9cm long, calculate the circumference of the circle.

asked by Christopher on June 30, 2014
5. ## chemistry

A gas is stored in a 3.5L container at 15 degrees celsius and 655mmHg. Calculate the number of moles of the gas in the container

asked by Anonymous on April 30, 2013
6. ## Physics

2. One +1.0 C (one coulomb) charge and another -1.0 C charge are located 1.0 m apart. a. Calculate the magnitude of the electric force between them. b. In what direction does the force act?

asked by Harris on May 31, 2018
7. ## chemistry

A gas is stored in a 3.5L container at 15 degrees celsius and 655mmHg. Calculate the number of moles of the gas in the container

asked by Anonymous on April 30, 2013
8. ## Physics

Two point charges are on the y-axis, one of magnitude 3.0 * 10^-9 C at y= 10cm and a second of magnitude 6.0 * 10^-9 at the point y=30cm. Calculate the potential at y= 60cm.

asked by Casanova on September 25, 2015
9. ## Physics

Calculate the force between a +5 µC test point charge and this source charge at a distance of 2.00 cm. (µC = 1.0 × 10–6 C) force=kq1q2/r^2 Have the formula now what do I do?

asked by Pat on May 19, 2012
10. ## maths

A body moving with constant acceleration travels the distance 6 m and 16 m respectively in 2 s and 4 s. Calculate the initial velocity and acceleration of the body

asked by manavi on July 18, 2015
11. ## Science

Calculate the partial pressure of co2 and o2 in a mixture of 2 gases consisting of 4.4g co2 and 6.4g o2, with a total pressure of100kpa

asked by Kathiel on November 14, 2018
12. ## chemistry

how do i calculate a weight/vol % from a molarity given the density? Molarity is 0.0303 M density = 1.52 g/mL, molar mass is 41.99 g/mol.

asked by Anonymous on April 24, 2016
13. ## chemistry

calculate the heat released when 166g of water at 23.0 degrees celsius are converted to ice at -10.0 degrees celsius

asked by Angela on January 21, 2011
14. ## Chemistry

Calculate z pH of a buffer solun containing o.1 M acetic acid & 0.1 M solun of sodiumacetate when 1 mL of 0.1M HCl is added to 100 mL of buffer .

asked by Ethio on December 6, 2011
15. ## Physical Science 2nd Semester

A student lifts a backpack with a force of 50 Newtons. She lifts the backpack 2 meters off the floor. Calculate the work that she has done.

asked by chris on May 24, 2011
16. ## Science

A 100kg block rests on a table. The area of contact between the block and the table is 4m2. Calculate the pressure.

asked by Christopher on September 23, 2015
17. ## statistics

There are two different formulas or methods that can be used to calculate SS. a. Under what circumstances is the definitional formula easy to use? b. Under what circumstances is the computational formula preferred?

asked by Liz on June 22, 2011
18. ## Chem

calculate the mass in grams of carbon needed to produce 160 grams of CO2 burning. C + O2 -> CO2

asked by Amber on December 15, 2011
19. ## Biochemistry

Calculate the free energy of hydrolysis of ATP, ADP, Pi concentrations are 3.4, 1.3, and 4.8 mM respectively. (ATP hydrolysis has delta G= - kJ/mol)

asked by Help Pleasssssssse!!! on October 6, 2010
20. ## chemistry

Calculate the linear momentum of photon of wavelength 750nm. What speed does an electron need to travel to have the same linear momentum.

asked by Aweda on November 5, 2016
21. ## science

A power of 200 kW is delivered by power lines with 48,000 V difference between them. Calculate the current, in amps, in these lines.

asked by Julia Kate on November 5, 2012
22. ## Chemistry

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.240 M HClO(aq) with 0.240 M KOH(aq). The ionization constant for HClO can be found here.

asked by Judith on March 3, 2014
23. ## Physics

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.

asked by Vinny on November 14, 2013
24. ## Physics

The launching speed of a certain projectile is 6.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.

asked by Kevin on December 1, 2015
25. ## problem's on gay lussac's equation

on igniting a mixture of c2h2 and o2,200cc of co2 is formed.calculate the volume of c2h2 and o2 in the original mixture

asked by Anonymous on December 26, 2015
26. ## Chem

assuming that core electrons contribute 1.00 and valence electrons contribute nothing to the screening constant, S, calculate Zeff for Cl and K.

asked by Mrs. Brisco on November 1, 2013
27. ## physics

Calculate the power output of a 1.7g spider as it walks up a windowpane at 2.5cm/s . The spider walks on a path that is at 25 ∘ to the vertical.

asked by Brandon on October 10, 2014
28. ## science

calculate the temperature of the gas when volume is 12m^3, if initially the volume was 8m^3 and its temperature was 30 °c.calculating by using charles laws.

asked by Blessings on January 25, 2016
29. ## MATH

Calculate the amount of 8% acetic acid needed to combine with water to make 600 ml of 3.5% acetic acid.

asked by Brittany on July 6, 2012
30. ## Chemistry

Given the following reaction: HCl(g) + SrO(s) ¨ SrCl2(s) + H2O Calculate the mass of HCl in grams that would react with 11.44 kg SrO.

asked by andrea on November 25, 2010
31. ## Chemistry

How do I calculate the percent yeild of copper give the mass and concentration of Cu(NO3)2 and the final mass of copper

asked by Dan on November 8, 2015
32. ## physics

a force acts on a body 0.5sec changing its momentum from 16.0kg to 21.0kg.calculate the magnitude of the force

asked by faith on January 26, 2012
33. ## Science

Calculate the extension of a spring that would be produced by a 20N load by a 15N load extends the spring by 3cm?

asked by Naurin. on February 11, 2019
34. ## math

calculate the monthly payment by loan amortization table: loan \$26000, down payment \$5000, 11% 36 months

asked by renee on June 20, 2010
35. ## Chemistry

Calculate the mass of a sample of gold that ocupies 5.0x 10 negative 3 power cm3. the density of gold is 19.3 g/cm3

asked by Kiersten on August 26, 2008
36. ## Chemistry

Calculate the pH of the titration of 100.00 mL of 0.200 M HOCI with 0.400 M KOH after 0, 25.00, 50.00, & 75.00 mL of KOH have been added. The Ka for HOCI is .000000035...Please Help!!!!

asked by Need Chem Help on April 17, 2010
37. ## Astronomy

Which of the terrestrial planets has the highest surface gravity? (Hint: if you look at ratios, you need not calculate every surface gravity value explicitly.)

asked by Jobeth on February 2, 2012
38. ## Physics

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.

asked by Vinny on November 14, 2013
39. ## Chemistry!!

A chunk of silver has a heat capacity of 42.8 J for 1ºC and a mass of 181g. Calculate the specific heat of silver.

asked by Meg Hat on May 21, 2010
40. ## Chemistry

Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 6.10 moles of magnesium perchlorate, Mg(ClO4)2.

asked by Landis on March 24, 2019
41. ## maths

A model of a car has a scale of 1:25,a model is 18cm long,calculate the metres and actual length of the car

asked by salma on January 23, 2013
42. ## math

Calculate the magnitude of a when a = (2, 3, -2). Find (1/|a|)xa. Is it a unit vector. I calculated the |a| = sqrt17. I don't know how to determine if it's a unit vector or not?

asked by Anonymous on March 29, 2008
43. ## Science

Two forces of resultant 100N are perpendicular to each other. If one of them makes angle 60 degree with the resultant. Calculate the magnitude of forces

44. ## Chemistry

Calculate the mass of AgCl that will dissolve in 100ml of 2 M NH3 ksp AgCl = 1.7x10^-10 and Kf of Ag(NH3)2 = 1.6x10^7

asked by Michelle on October 25, 2013
45. ## physics

The length of a pipe, closed at one end is is 90 cm. Calculate the frequency of the standing wave. What is the fundamental frequency of the pipe?

asked by amy on December 14, 2012
46. ## physical science

calculate the change in thermal energy when 120kg of sand warms from 10 degrees celcius to 90 degrees celcius

asked by Anonymous on December 7, 2012
47. ## physics

a bullet of mass 30 g. is fired from a pistol of 2.1kg at a velocity of 300 m/s calculate the recoil velocity of the pistol

asked by sumit on August 4, 2012
48. ## Calculus

Write the following function as the sum of an odd and an even function. Then calculate the integral over the given interval using the properties of odd and even functions. (x-1)^3, I=[-1,1]

asked by Jamie on April 13, 2017
49. ## chemistry

For the titration of 20.0 mL of 0.1500 mol/L NH3(aq) with 0.1500 mol/L HI(aq)(the titrant), calculate a) the pH before any HI(aq) is added b) the pH at the equivalence point

asked by Ross on April 6, 2008
50. ## Physics

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.

asked by Vinny on November 14, 2013
51. ## chemistry

calculate density of CH4 gas at 0C 700 mass Hg pressure.Molecular mass of CH4 is16

asked by Anonymous on January 15, 2012
52. ## Chemistry

Calculate amount of 1 M acetic acid and 1M sodium acetate necessary to prepare 50 ml of a 0.15 M buffer at ph 4.80. (pka acetic acid =4.74)

asked by Marie on October 8, 2014

#1) how many atoms are represented by 2.0 mol of carbon? I think 12.01 x 10^23 #2) Calculate the # of atoms of each element present in 3.67 mol of H^2SO^4...I have no idea how to do this one?

asked by Sarah H on May 22, 2008
54. ## chemistry

A weak base that encompasses a concentration of 1.4 mol per litre has a percent ionization of 0.63%. Calculate the Kb of this weak base

asked by Laura on April 9, 2008
55. ## chemistry

At a certain temperature, 514, Kp for the reaction, Cl2(g) + Br2(g) 2 BrCl(g), is 6.98 x 107. Calculate the value of DGo in kJ for the reaction at 514 K.

asked by sam on April 24, 2011
56. ## Chemistry

If a sample of ammonium sulfate contains 1.75 grams of nitrogen [N] atoms, calculate the mass (in grams) it contains of sulfur atoms [S].

asked by Amanda on October 28, 2014
57. ## phyiscs repost 2

Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2 For this question don't I use B=log10(I/IO) So it would be B=log10(2.25/1.0e-12) right?

58. ## math

the speed of a point A due to the rotational of the earth is twice that of a point B.if A is on latitude 22 degree north,calculate the latitude of B.

asked by abdulateef habib on November 7, 2018
59. ## Chemistry

Calculate ΔG∘rxn and E∘cell for a redox reaction with n = 1 that has an equilibrium constant of K = 28? What would the answer be to this? Could someone work this out for me please? ΔG∘rxn = ......kj E∘cell = ......V

asked by John on April 12, 2014
60. ## chem

calculate the density of each of the following gases: a)NH3 at 25 Degrees Celsius and 1.2 atm b)Ar at 75 Degrees Celsius and 745 torr

asked by Ashley on April 29, 2014
61. ## physics

An inclined plane rises to a height of 2m over a distance of 6m .calculate: A.the Angle of the slope B.the VR(and so IMA) of the inclined plane C.

asked by abubakir on May 13, 2019
62. ## Chemistry

A chunk of silver has a heat capacity of 42.8 J/degrees C and a mass of 181g. Calculate the specific heat of silver.

asked by Ralph on May 19, 2010
63. ## Chemistry

Calculate E, E^o and (delta)G^o for the following cell reaction: Mg(s) + Sn2+(aq) (yields) Mg2+(aq) + Sn(s) [Mg2+] = 0.045 M, [Sn2+] = 0.035 M

asked by Julie on May 11, 2010
64. ## math

an equilateral triangle of 20cm is inscribed in a circle calculate the distance of a side of a triangle from the center of the circle

asked by fatimoh on November 11, 2018
65. ## math

the length of each edge of a cube is of length 3m. the edges are increased by 20%. Calculate the percentage increase in the volume of the cube.

asked by Smith on April 7, 2017
66. ## chemistry

I need to calculate the Ka of the acetic acid from two titration curves involving acetic acid. Then report the % error in each how do i go about this? what values do i need to know?

asked by Amy on May 9, 2008
67. ## chemistry

If you calculate the density of a gallon of CO2 gas at 27degrees celcius and 0.50 atomic pressure what the atomic pressure be?

asked by Angela on March 31, 2010
68. ## Chemistry 114

Write down the Ksp expression for CaF2. If the molar solubility of CaF2 at 35℃ is 1.24×10^(-3)mol/dm3, calculate the value of Ksp.

asked by Chenny on April 12, 2010
69. ## Chemistry

Given the following values of ΔH, ΔS and T, calculate ΔG (in kJ). The values are: ΔH = -17.0 kJ, ΔS = -50.0 J/K, and temperature = 10.0 C.

asked by Jason on September 3, 2015
70. ## Chemistry-is this right?

Water has a pH of 4.9? Calculate H3O and OH 1. H3O= 10^4.9=1.25*10^-5 2. OH= 14- 4.9= 9.1

asked by Clare on April 30, 2015
71. ## Divine mercy school

The arithmetic mean of x,y andz is 6 while that of x,y,z,t,u,v and w is 9. Calculate the arithmetic mean of t,u,v and w

asked by Goody on August 20, 2015
72. ## Algebra

calculate the slope, x-intercept, and y-intercept for 4.2x + 3.8y = 1.9

asked by Vilma on June 5, 2012
73. ## Algebra

calculate the slope, x-intercept, and y-intercept for 3x = -2

asked by Vilma on June 5, 2012
74. ## math

How to calculate angle B if u are given AB=10,6 and AC=6 then angle D=alfa

asked by tamara on July 24, 2011
75. ## Math

Given that f(x)= 2x-5 and g(x) =x^2-31, calculate the value of 1)f(-2)= 2(-2)-5 = -1 is this correct? 2) gf(1)= 1-31 = -30 is this correct? 3)f indirect 1(3) how do i do this one?

asked by Rita on June 16, 2009
76. ## Science

How do you calculate the preparation of 0.1M HCl using 33% HCl?

asked by Raksha on March 20, 2014
77. ## math

how do I calculate what is left over if 3/5 of a casserole from 8/9 of a casserole?

asked by Toney on March 15, 2014
78. ## Chemistry

For a certain reaction, ΔH° = –76.8 kJ and ΔS° = –225 J/K. If n = 3, calculate E° for the reaction at 25°C.

asked by Tayla on August 1, 2013
79. ## economics

How to calculate item weight of an item

asked by Lisa on September 14, 2014
80. ## hello reiny damon steve can you help me physics

Find the Gravitational potential at a point on the earth's surface. Take mass of earth as 5.98*10^24kg, it's radius as 6.38*10^6m and G=6.67*10^-11Nm^2kg^-2. Plz i need sir damon and steve including reiny to show me step and solution plz

asked by danu on May 8, 2017
81. ## calculus?

Hello can u help? I need a solution to calculus problem I have \$500.00 to spend on fencing for a garden. The fence for the street side costs \$30.00 per foot and the other three sides cost \$10.00 per foot. what dimensions will give you a rectangle for the

asked by GiGi on July 14, 2012
82. ## chemistry

How many milliliters of a 3.00 M solution of hydrochloric acid are needed to completely react with 25.0 g of zinc sulfide according to the chemical reaction shown below? ZnS(s) + 2HCl(aq) ? ZnCl2(aq) + H2S(l) (Answer to three significant digits.) _____ mL

asked by joe walker on December 28, 2011
83. ## Chemistry Chemical Reactions pls help <3

2AgNO3 + CaCl2 ---> Ca(NO3)2 + 2AgCl all of the substances involved in this reaction are soluble in water except AgCl which forms a solid at the bottom of the flask . Suppose we mix together a solution containing 12.6 g of AgNO3 and one containing 8.4 g of

asked by Claire on January 13, 2016
84. ## Chemistry

Find the number of mg Na2co3 FW = 106g/mol required to prepare 500ml of 9.2ppm NA solution. ppm = mg/L 9.2mg/1000ml x= 0.0092 x 500ml = 4.6mg x 23 = 106mg The right answer 10.6mg NA weight = 23 Who helps me to solve it for me.

asked by Fai on November 4, 2012
85. ## math

1. determine which order pair is a solution of y = -5x + 10 A. (-15,5) **** B. (2,0) C. ( -1 , -5 ) D. (3, 25 ) 2.on which of the following lines does the point ( 7,1 ) lie? A. y-5x = 4 B. y=x -10 C. y = -4x +3 *** D. y + -x +8 3.find the slope of the line

asked by andrew on December 1, 2016
86. ## Chemistry

Solid Na2SO4 is added to a solution which is 0.020 M in Pb(NO3)2 and 0.045 M in AgNO3. Assume the volume remains constant. Ksp = 2.0 10-8 for PbSO4 and Ksp = 1.2 10-5 for Ag2SO4. What is the concentration of the first ion precipitated when the second ion

asked by John on March 14, 2013
87. ## chemistry

50.00 mL of 1.0 M HCl and 50.00 mL of 1.0 M NaOH are mixed. The temperature is observed to increase by 10.0 degrees C. How much energy (in J) was absorbed by the calorimeter? Assume a density of the reaction mixture of 1 g/mL. Specific heat of the solution

asked by hongkong on May 27, 2010
88. ## Analytical Chemistry

This question pertaining to buffer systems! How would you prepare 10.0mL of 0.0100M phosphate buffer, pH = 7.4 0, from stock solution of 0.100M KH2PO4 and 0.250M K2HPO4, pKa of KH2PO4 is 7.20. Please help me in figuring out how I even start this

asked by Katie on August 3, 2016
89. ## Chemistry

Na₂CO₃ (s) + 2HCL (ag) → 2NaCl (ag) + CO₂ + H₂O (l) If 4.25g of sodium carbonate is reacted completely with excess hydrochloric acid as 3M HCl, how many mL of HCl would be consumed? Note: Assume 3M HCl contains 3.00 moles of HCl per liter of

asked by Shelby on April 30, 2012
90. ## Biology

Describe four ways that plants protect themselves from environmental conditions using one example from each of the following categories: a. hormone b. tropism c. plants structure d. plant process In your answer be sure to include the specific threat and

asked by Michelle on March 11, 2008
91. ## Physics :(( help please TT

Consider a five-pointed star made of resistors as shown below. Each resistor has resistance R=6 Ω. Find the equivalent resistance in Ohms between the points A and B. Details and assumptions Note: Points ABCDE are labeled for easy reference if you need to

asked by OIan on April 23, 2013
92. ## chemistry

The Ka of a monoprotic weak acid is 7.25 × 10-3. What is the percent ionization of a 0.167 M solution of this acid? If the concentration is more than 1000 times greater than the Ka, then you can make an assumption that simplifies the algebra needed to

asked by sara on April 10, 2013
93. ## Chemistry

N2 + O2 -> 2NO enthalpy change = +180.6kJ c) what is the enthalpy change for the formation of one mole of nitrogen monoxide? Okay, I know this question is super easy, but I don't know how to do it; if someone could please give me a detailed explaination on

94. ## Chem (continuation)

I am a little confused regarding a question I posted yesterday ("Chem" Tuesday, March 6, 2007 at 9:29pm) I understand the answer to the first question: What would the pH of this solution be after 0.01 mol of HCl was added? I got 6.09 I'm still kind of

asked by Marisol on March 7, 2007
95. ## Chemistry

g+ 2HCl-->MgCl2+H2 The mass of the HCl is 24.852 g mass of the Mg is .990 g and the mass of the calorimeter is 3.711 g. the change in temperature of the solution was +19 degrees celcius. itd be great if i could just get a basic equation to use or something

asked by Kevin on April 26, 2010
96. ## chemistry

Butlylated hydroxytoluene (BHT) is used as an antioxidant in processed food. (It prevents fats and oils from becoming rancid.) A solution of 2.500 g of BHT in 100.0 g of benzene had a freezing point of 4.880⁰ C. What is the molecular weight of BHT?

asked by Mike on September 14, 2010
97. ## CHEMISTRY

Determine the followng solutes disolved in 100 g of water will form unsaturated or saturated solution a. 180g Kl at 60DGREE CELSIUS . 60g KBr at 30 DEGREE CELCIUS c170g KNO3 at 50 dgree celcius d. 20 g NaCl at 90Degree celcius

asked by jhelo on February 16, 2014
98. ## mat116

Can you please look over these and let me know if they are right? 1/4(5x-1/2)-5/3

asked by Anonymous on October 1, 2009
99. ## Biology

What can you say about the amount of hydrogen ions relative to the amount of hydroxide ions in a solution that has a pH of 2?

asked by Malcolm on November 22, 2015
100. ## chemistry

How many moles of acetic acid are in 100ml of a 0.05M solution of acetic acid?

asked by Marian on September 1, 2010