# 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-
## 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* -
## 12th grade chemistry

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

*asked by Kelsey on July 30, 2010* -
## 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* -
## Busniess

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

*asked by Tali on January 12, 2011* -
## 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

*asked by Fading on January 16, 2017* -
## 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* -
## Chemistry

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

*asked by Joe on July 27, 2010* -
## 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* -
## 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* -
## 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* -
## math advanced functions grade 12

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

*asked by illiah on July 24, 2012* -
## 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* -
## 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* -
## 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* -
## 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* -
## math

7x-3y+4z=18 13x+6y+8z=30 11x-9y-12z=16 Find x,y,z please show the solution pleaseee

*asked by Jean on October 4, 2015* -
## 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* -
## 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* -
## chem

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

*asked by me on October 18, 2009* -
## 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* -
## 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* -
## 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* -
## 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* -
## math

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

*asked by amar on November 6, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## chemistry

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

*asked by kalynn on January 30, 2012* -
## Science

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

*asked by Piyush k. on December 27, 2018* -
## 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* -
## science

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

*asked by j on February 10, 2010* -
## 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* -
## algebra

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

*asked by sharl on May 13, 2011* -
## 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* -
## chemistry

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

*asked by linda on February 5, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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?

*asked by ggift on September 10, 2009* -
## 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* -
## 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* -
## 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* -
## math

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

*asked by Andrzej on February 10, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## chemistry

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

*asked by FB1907 on June 30, 2012* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## Chemistry

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

*asked by Mad on April 17, 2012* -
## Business

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

*asked by Jay on June 16, 2010* -
## 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* -
## 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* -
## 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* -
## social studies

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

*asked by nerd nada on June 1, 2010* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 8th grade

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

*asked by justina on November 13, 2008* -
## 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* -
## Chemistry

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

*asked by Vader on December 9, 2013* -
## 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* -
## 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* -
## 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* -
## 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*

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