# 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 172
1. ## Chemisty

How many milliliters of 5.50 M HCl must be diluted to make 350. mL of a 0.500 M solution?

asked by Wyatt on April 10, 2012

How do I prepare 500 ml of a .100 mol/L solution of copper sulphate.

asked by Kelsey on July 30, 2010
3. ## Algebra

I am having trouble with two problems. I can't seem to get a solid solution to either one of them. 3/y+5 + 6/7y add and simplify 5-r/8-r = 3/r-8 solve Can someone help me please? Thanks so much.

asked by Aria on August 1, 2011
4. ## Busniess

what economic system iss the best solution in handling a crisis proportion?

asked by Tali on January 12, 2011
5. ## Algebra 2

The point (4, 1) is a solution to which of the following systems of inequalities? a. y < 3x - 1 and y > -x + 1 b. y > 3x - 1 and y > -x + 1 c. y > 3x - 1 and y < -x + 1 d. y < 3x - 1 and y < -x + 1 I'm very confused:( I don't know how to solve this. Please

6. ## Chemistry

The \rm p \it K_{\rm a} of this reaction is 4.2. In a 0.74\it M solution of benzoic acid, what percentage of the molecules are ionized?

asked by Joe on February 21, 2013
7. ## Chemistry

Which solution has a higher vapor pressure, 1 M NaCl or 1 M glucose(C6H12O6)?

asked by Joe on July 27, 2010
8. ## Chemistry

I'm having trouble balancing this equation: SO3^2- --> S2O4^2- It's in a basic solution. Thanks.

asked by C on April 7, 2013
9. ## chemistry

What is the concentration of a solution, in gsolute/100gsolvent, made using 2.29 g of KNO3 in 2.03 g of H2O?

asked by Anna on January 24, 2014
10. ## AP Chemistry

What is the pH of a 0.41 M solution of pyridinium chloride (C5H5NH+Cl−)? (Kb for pyridine is 1.5×10−9.) Answer in units of pH

asked by Gabriella on January 24, 2014

Find the solution set to the following rational inequality, 240/x+8 > 20x/x+1

asked by illiah on July 24, 2012
12. ## science

How much water should be added to 55.0 mL of 0.201 M HCl to dilute the solution to 0.155 M?

asked by Lauren on April 18, 2011
13. ## science

How to cal. The range of π+arcsin(3x-4x^3).give the whole solution step wise

asked by RALLZO on October 3, 2015
14. ## Science

Why is that instantaneous rate of reaction does not change when a part of the reacting solution is taken out?

asked by Vikrant on June 10, 2016
15. ## geometry

what is the solution to this problem? -2=2x^2-7x negative two equals two times "x" squared minus seven "x".

asked by anonymous on September 22, 2008
16. ## math

asked by Jean on October 4, 2015
17. ## chemistry

how much concentrated 12 M hydrochloric acid is needed to prepare 100 mL of a 2.0 M solution?

asked by dellanie on March 28, 2012
18. ## Chemistry

If 25.9 mL of 300 M NaCl is diluted to 136 mL, what is the molarity of the dilute solution?

asked by Kimber on October 25, 2012
19. ## chem

How is the number of moles of NaOH affected at the equivalence point of the solution?

asked by me on October 18, 2009
20. ## Algebra

Write the solution to the inequality in set builder notation. 9t - 4 > 32 My answer is (t I t > 4)

asked by Faye on September 16, 2014
21. ## chemistry

I have 120 ml of a 2M NAOH solution. If Ionly use 10 ml the molarity of the 10 ml is stil 2M, correct?

asked by anonymous on February 10, 2015
22. ## chemistry

If 39.2 of 0.177 is required to neutralize completely 22.0 solution, what is the molarity of the acid?

asked by Ivy on May 7, 2011
23. ## Algebra

Can you please help? I am working System of Equations. I need to find the solution of each of the following systems: How do I solve...thank you Y = 5x -3 and Y = -3x +5

asked by Jaraud on December 4, 2016
24. ## math

find general solution of y¡±-y¡¯=squre of sinx by variation parameter

asked by amar on November 6, 2013
25. ## Chemistry

What voltage would be measured in a 1.00 x10-3M acetic acid solution (pH=3.88)? Assume aH+= [H+].

asked by Glyn on October 21, 2014
26. ## Chemistry

If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?

asked by J on November 29, 2015
27. ## Chemistry

If a box contain 256 water molecules and 1 Na+ ion , then what will be the Molarity of the solution.

asked by Robin Jain on November 29, 2016
28. ## math

find the measure of an angle if it is 6 degree less than twice its complement with solution pls.

asked by Sooyoung on January 13, 2015
29. ## chemistry

Why must thiosulfate solution be standarized every couple of days? Please explain with an equation. Thanks.

asked by kalynn on January 30, 2012
30. ## Science

Preparation of M/20 oxalic acid solution and determine it strength. For practical

asked by Piyush k. on December 27, 2018
31. ## chemistry

How many grams of water should be added to 25.0 g of NaCl to produce a 0.450 m solution?

asked by CC on February 10, 2010
32. ## science

is dilution of a solution the answer to acid or base pollution in this world? why?

asked by j on February 10, 2010
33. ## ntc

What is the solution using gauss jordan Elimination.. 2x-4y+5z=10 6x+8y+3z=12 X-7y-9z=63 Pls.help me to solve this problem

asked by ella ramos on December 2, 2015
34. ## algebra

Solve this equation. Identify any extraneous solution. Show all steps. x = [3x + 40]

asked by sharl on May 13, 2011
35. ## Chemistry

How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)

asked by Matt on February 13, 2013
36. ## chemistry

I have 50mL of0.2M of potassium permanganate solution.What is the Molarity of KMnO4?

asked by linda on February 5, 2010
37. ## Chem 1A

Help please! How many moles of NaOH must be added to 1.0 L of 3.0 M HC2H3O2 to produce a solution buffered at each pH? 1) pH= 3.78 2) PH= 6.52

asked by Mackenzie on March 15, 2012
38. ## algebra

is -2i square root of 2 a solution to x=8? lets check: (-2i sqrt 2)^2= -1^2 * 2^2 * i^2 *2 =-8 Answer: no.

asked by Anonymous on November 8, 2006
39. ## pysical science

how do you find the density of a solution where the mass=60.75gms and the volume=45ml

asked by len on May 12, 2011
40. ## Math

6x -5y =20 and 5y - 6x = -20 A) No Solution B) Infinity C) A Point Consistant or Inconsistant Depdendant or Independant

asked by Susie on May 27, 2010
41. ## Math

Find the interval for b such thtat the equation has a t least one real solution. i. X^2+bx-6=0 ii. 2X^2+bx-7=0 iii. x^2+bx+3=0 iv. 3x^2+bx+5

asked by Anonymous on January 19, 2015
42. ## Science

Solution of question The work done by the heart if it's beats 72times per minute

asked by Muskaan Sachdev a on December 1, 2016
43. ## math

6x - 5y= 20 and 5y - 6x= -20 Is there a solution, infinity, A point Consistent or inconsistent dependent or independent

asked by Susan on May 26, 2010
44. ## Chemistry

How many grams of HCl need to be dissolved in 0.5L of water to prepare a solution of pH 1.5? Does anybody know how to work this out? Thanks :)

asked by Matt on February 13, 2013
45. ## chemistry

ewhat is the solubility of X in mol/dm3 if 25cm3 of its saturated solution contains 4.0g of X

asked by emma4ever on March 15, 2012
46. ## ALGEBRA

what does it mean to state the solution in the problem if the equation is 2x^2-3x-4=0 (2x squared) and the graph is 2x^2-3x-4??? Can someone explain this to me?

47. ## Math

Use the substitution method to find solution sets (x,y) for the following systems of equations: 3x-5y=-11 6x+2y=26

asked by Scott on June 20, 2009
48. ## Cemistry

Why do we have to heat KMnO4 solution when we have to do the titration with the oxalate ions for such reaction?

asked by Tukana on May 18, 2010
49. ## Chemistry

What is the period 3 element whose 2+ ion is isoelectronic with neon? How can I find the solution? Thanks

asked by Ceamus Angelina on April 6, 2018
50. ## math

solve the equations by finding the exact solution this is question from log 3=x-3

asked by Andrzej on February 10, 2013
51. ## Science

Explain 2 reasons why salad dressing is not a solution I think one is it separates after a while of sitting is that right and I can't think of another

asked by Hannah on February 12, 2010
52. ## algebra

for which values of a and b does the following pair of linear equation have an infinite number of solution ? 2x+3y=7 (a-b)x+(a+b)y=3a+b-2

asked by somiya on July 16, 2012
53. ## Biochemistry

If you make up a solution of 100mL of 0.1 M Hepes in the basic form, what will be the pH? pKa = 7.55

asked by Megan on September 8, 2014
54. ## chemistry

what is the molarity of the solution comtaining 2.5g of acetic acid in 75g of benzene

asked by saira on April 7, 2016
55. ## chemistry

How much concentrated 12 M hydrochloric acid is needed to prepare 100.0 mL of a 2.0 M solution?

asked by {RayRay} NEED HELP PLZ on May 11, 2010
56. ## chem

what is the ph of a solution in which 250.0 ml of .200 M HNO3 is added to 280.0 ml of .150 Ba(OH )

asked by k on November 13, 2012
57. ## chemistry

Explain how to make a 1.5M solution of copper (II) sulfate with a volume of 250 mL.

asked by valentina on February 6, 2011
58. ## calculus

Find the particular solution that satisfies the differential equation and the initial condition. f ''(x) = x^2, f '(0) = 8, f(0) = 8 f (x) = ?

asked by Sam on April 7, 2016
59. ## Algebra

What is the solution of the linear-quadratic system of equations? {y = x^2 + 5x - 3 {y - x = 2 So confused about how to do this any help is appreciated.

asked by Samantha Taylor Greenfield on November 22, 2013
60. ## chemistry

what is the pH of the solution formed when 25 mL of 0.173 M NaOH is added to 35 mL of 0.342 M HCl?

asked by sarah on December 5, 2012
61. ## Chemistry

What pH is required to start precipitation of Fe(OH)3 from a 0.380 M solution of FeCl3? Ksp of Fe(OH)3 = 4.0e-29.

asked by Pob on April 3, 2011
62. ## Chemistry

If I was to react a borax solution with a sulphuric acid to neutralise it, what products will I get?

asked by Serre on January 1, 2009
63. ## chemistry

what is the molar solubility of Fe(OH)3 in a buffered solution with pH=8.2 at 25 degrees Celsius given ksp =4.0*10^-38.

asked by cliff on December 4, 2015
64. ## math

Can someone please check my answers? Thank you! 1. is (-8,-9) a solution of 2x+4y=12 No 2. Solve using the multiplication principle. -1/2x=-9/10 answer: 9/5

asked by deedra on January 5, 2009
65. ## Chemistry

The approximate pH of a 3.0 x 10-3 M solution of the strong acid H2SO4 is a) 3.5 b) 3.0 c) 2.5  d) 2.2  e) -3.0 i got C by -log(3.0e-3) is this correct?

asked by Linda on March 14, 2012
66. ## Math

Use the given root to find the solution set of the polynomial equation. x^3 + 8x^2 -18x +20= 0 ; 1+i

asked by Chelsea on February 1, 2012
67. ## discrete math

Find the solution to the following lhcc recurrence: an=3nan−1 for n2 with initial conditions a0=4.

asked by cjones on April 20, 2012
68. ## Chemisty

How much KNO3 will you have to add to 100 g of water at 40° C to make a saturated solution?

asked by Hannah on August 1, 2011
69. ## chemistry

Please I need help in knowing how to solve this. I know I need to take the antilog of something but don't know what.What is the values of [H3O+] for a solution with [OH−]=1×10−5M?

asked by chelsea on November 22, 2013
70. ## College algebra

use interval notation to express the solution set of the inequality |2x + 3|> or equal to 9

asked by Jess on February 1, 2012
71. ## chemistry

how many grams of ammonium sulfate are needed to make a .25 M solution at a concentration of 6M?

asked by mora on May 11, 2010
72. ## chemistry

What is the molarity of a 28.9 g of CaCl2 dissolved in water to make up 0.78L of solution?

asked by Anonymous on June 3, 2014
73. ## Chemistry

What is the molecular mass of a substance X if 1.00 L of a solution containing 4, 5 g of X has an osmolality of 0.337 mmHg the 30° C?

asked by Caline on April 14, 2016
74. ## chemistry

How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate?

asked by FB1907 on June 30, 2012
75. ## chemistry

Considering a 1.0M of each solution, which has the greatest osmolarity? 1. FeCl3 2. K2O 3. HCl 4. HC2H3O2

asked by Gina on May 11, 2011
76. ## chemistry

what is the concentration, in % m/m of a solution prepared from 50.0g sodium chloride and 150.0g of water

asked by tim on April 5, 2011
77. ## Chemistry 1200

0.238 M glucose (C6H12O6) in water (Assume the density of the solution is 1.00 g/mL.)

asked by Rukky on January 25, 2011
78. ## algebra

Express your answers as simplifier, improper fraction if necessary [3(a+3)]=29 the solution set is { }

asked by maribel on January 25, 2015
79. ## algebra

can someone please check my answer to this problem? solve for indicated letter. n=m+d, for m the solution is m= (n+d)/m is this correct?

asked by Anonymous on September 26, 2009
80. ## Chemistry

How much water must be added to 24.0 grams of salt ot make a solution that is 12.0% by mass?

asked by Beth on April 9, 2011
81. ## Chemistry

what is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?

Which economic system is the best solution to handling a crisis of epic proportion?

asked by Jay on June 16, 2010
83. ## chemistry

What is (a)PH(b) POH of a solution wholes hydrogen ion consentration is 5.00x10-4?

asked by Anonymous on March 20, 2012
84. ## calculus

the equation cosx=x has a solution in what interval?...the answer is given as [0,pi/2] can someone please explain why?? thnks

asked by sylvia on November 13, 2008
85. ## Calculus I

Using Newton's Method, determine the first approximation to the solution of: e^(4x)= 10-2x starting with x=0 what is x1= ??? P.S. ( the 1 is a subscript )

asked by Matthew on April 8, 2011
86. ## social studies

A _______ uses metal plates and a conducting solution to produce current

87. ## Chemistry

How many grams of Mg are needed to react completely with 3.80 L of a 2.50 M HF solution? Mg + 2HF --> MgF^2 + H^2

asked by Lexa on April 6, 2011
88. ## Chemistry

How many grams of NaF should be added to 612 ml of 0.4 M HF (Ka = 6.8 x 10-4) to produce a buffer solution where pH = 3.10?

asked by Ashley on April 12, 2013
89. ## Science

Why is that instantaneous rate of reaction does not change when a part of the reacting solution is taken out?

asked by Sheba on September 14, 2009
90. ## Can someone help me Math problem!!

Determine whether the ordered pair is a solution of the linear inequality. 9)x5x-12;(-6,1) Can someone help me with these two question please!!?

asked by that emo girl! on January 29, 2018
91. ## Gaussian Elimination Method

Write the system of equations as an augmented matrix. Then solve for x and y. -3x-y=11 -9x-2y=34 Solution =

asked by Devin on December 15, 2016
92. ## Chemistry

What is the concentration of a solution which contains 1 mole of CaCl2 dissolved in 2000mL of solutions?

asked by KT on June 1, 2010
93. ## mathes for management

Use gauss Jordan elimination method to find solution set of 4x+5y+3z=23 3x+2y+z=10 2x+5y-z=9

asked by legesse on December 13, 2016

Why the Virginia Plan wasn't a suitable solution to the problem of representation?

asked by justina on November 13, 2008
95. ## physics

What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water?

asked by keria on January 20, 2012
96. ## Chemistry

What is [H+], [OH-], pH, and pOH for a 0.048mol/L solution of the weak benzoic acid, C6H5COOH?

97. ## Science/Chemistry

please help... What is the molarity of 3.68mL of a solution containing 0.0025 moles of calcium chloride?

asked by Fisher on March 21, 2012
98. ## Math

If the 4-digit number 4AB2 is divisible by 44, what are the values of A & B? (Solution pls...)

asked by MNHS_HELP on January 26, 2015
99. ## Chemistry

How many milliliters water are needed to make a 0.171 M solution that contains 1.00 g of NaCl?

asked by Rob on April 11, 2013
100. ## Algebra

Rational Expressions. 1.) 2x^2-8x 8x^2 _______ / ____ x^2-16 (x+4)^2 Solution: x+4 ___ x Is this correct?

asked by Anonymous on September 23, 2009