# 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 176-
## chemistry

What is the original molarity of a solution of formic acid (HCOOH) whose pH is 3.74 at equilibrium? ka =1.7x10^-4

*asked by rodrigue on February 19, 2010* -
## physics

how long does a car with an acceleration of 2.0 m/s^2 take to go from 10m/s to 30m/s?and show the solution how do you get the answer.

*asked by ricajane on November 24, 2011* -
## Chemistry

Name the product formed when carbon two oxide is passed into potassium hydroxide solution.

*asked by Yaseerah on May 20, 2015* -
## chemistry

How would you prepare a solution of about 8mg/100ml of ascorbic acid in water (25ml)?

*asked by solution chemistry on February 21, 2014* -
## Chemistry

At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J

*asked by Jude on February 12, 2009* -
## Math Help?! 7th grade.

1. Determine which ordered pair is a solution of y = x*2–2. (5, 21), (–5, 24), (–1, –1), (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither.

*asked by Katerina on April 19, 2013* -
## chemistry

describe the detailed procedure of how to prepare 500 ml of 1M of sodium acetate solution.

*asked by Diinho on August 22, 2013* -
## Chemistry

Is "a color of solution becoming less intense due to dilution" maybe evidence of chemical reaction or not?

*asked by Anonymous on November 21, 2016* -
## Linear equations

I keep getting this wrong and can't figure out why {60x+10y=-16 -50x-100y=50 The solution to the system is:

*asked by Carlos on April 7, 2017* -
## Chemistry

How many grams of lithium nitrate, LiNO3, are required to prepare 3.00 × 102 mL of 2.00 × 10–1 M solution?

*asked by Chris on May 12, 2010* -
## Science

1. We dissolve 0.005 mole of strontium chromate in 1 L of solution at 25°C. Will a precipitate be formed?

*asked by Rachel on December 8, 2015* -
## chemistry

The volume of 0.025M Ca(OH)2 solution which can neutralise 100ml of0.0001M H3PO4

*asked by Arun on August 31, 2015* -
## chemistry

6) How many grams of copper (II) fluoride, CuF2, are needed to make 6.7 liters of a 1.2 M solution?

*asked by jeff on May 11, 2010* -
## science

If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

*asked by Andrea on April 18, 2013* -
## Chem

what is the hydronium-ion concentration at equilibrium in a 0.71 M solution of aniline (Kb=4.2x10^-10) at 25 Celsius

*asked by Che on March 19, 2013* -
## Chem

what is the percent ionization at equilibrium in a 0.31M solution of dimethylamine (Kb=4.2x10^-10) at 25 Celsius

*asked by Che on March 19, 2013* -
## Math

A manchine prints 1500 newspaper in 45 minutes . How many will it print in 2 hours solution?

*asked by Sandhya Pandey on November 12, 2016* -
## chemistry

How many g of NaOH is needed to make 300.0 mL of a 20 % (w/v) solution? please please show all work I'm very lost

*asked by Thomas Ruger on April 2, 2017* -
## chem

How many grams of SO2 are needed to make 250 ml of 0.750 molar solution?

*asked by Karen on August 28, 2012* -
## Chemistry

How many grams of SO3 are needed to make 250 ml of 0.750 molar solution?

*asked by Karen on August 28, 2012* -
## Chemistry

How many g of NaOH is needed to make 300.0 mL of a 20 % (w/v) solution? I'm so lost right now I have absolutely no clue

*asked by Thomas Ruger on April 2, 2017* -
## Chemistry

What volume of a 0.600 M solution of AgClO4 is needed to produce 160g of AgCr04?

*asked by Tara on September 27, 2010* -
## chem

The ion product Of D2O is 1.35x 10^-15 at 25 degrees C. For a solution to be acidic the PDF must be what?

*asked by court on April 22, 2012* -
## Chemistry

100 ml of 0.01N HCl is added to 0.9L of distilled water. What would the final pH of the solution be?

*asked by Kristin on August 30, 2012* -
## Chemistry

A student mixes 45.0 ml of .150 M HCL with 30.0 ml of .200 M NaOH. What is the pH of the resulting solution?

*asked by Juliano on February 10, 2012* -
## Algebra

Could someone please help me with this problem? Solve using the multiplication principle. Don't forget to check. -z=35. The solution is z=

*asked by B.B. on February 22, 2010* -
## Chemistry

What is the concentration of the SCN- ion in the stock solution of 2.00 x 10-3 M NaSCN in 0.10M HNO3?

*asked by noah on March 7, 2012* -
## Chemistry

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked by Kris on September 15, 2013* -
## Chemistry help needed

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked by Kris on September 15, 2013* -
## Chemistry help please

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked by Kris on September 16, 2013* -
## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

*asked by Laura on February 12, 2012* -
## chemistry

What mass of Na2SO4 is needed to make 8.5L of 4.0M solution? Is the answer 7480 grams?

*asked by lulu on March 20, 2016* -
## science

Briefly describe how you would prepare 500cm of 1mole of NaCl solution in the laboratory.(Na-23,Cl-35.5)

*asked by Precious Appiah on March 18, 2016* -
## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

*asked by Laura on February 12, 2012* -
## Chemistry

? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.

*asked by Riley on April 7, 2008* -
## Chemistry

What would happen to the color of a dilute solution containing FeCL4 if you added concentrated HCl?

*asked by Christina on April 26, 2010* -
## AED

How might that be a solution to dealing with instruction and assessments of varying levels of language development?

*asked by NENAS on June 24, 2009* -
## chemistry

In an electrolytic solution the density of CuSO4 decreases or increases or remains constant?

*asked by prashant on September 12, 2016* -
## chemistry

Convert .25 L of a .025 M solution of NaCL starting with solid NaCI and water

*asked by mj on February 13, 2012* -
## Math

1. Solve each inequality and express the solution set in interval notation. a. 3 < |(x-3)/2| < 5 b. 5 ≥ |(x+2)/3| > 1 2. 4 < 2x-8 ≤ 10 ans.: (a)(9,-3) (-7,13) (b) [-17,13] (1,-5) 2. (6,9]

*asked by NR on October 30, 2016* -
## Math

Solve each inequality and express the solution set in interval notation. a. 3 < |(x-3)/2| < 5 b. 5 ≥ |(x+2)/3| > 1 ans.: (a)(9,-3) (-7,13) (b) [-17,13] (1,-5)

*asked by NR on October 30, 2016* -
## Chemistry

(a) How many grams of KNO3 are needed to make 430 mL of a solution that is to contain 2.9 mg/mL of potassium ion?

*asked by Mark on June 3, 2015* -
## chemistry

Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH

*asked by Laura on February 12, 2012* -
## Chemistry

What is the solubility of X in mol/dm3 if 25cm3 of its saturated solution contains 4.0g of X (Molar mass of X=60)

*asked by Toyety on March 21, 2016* -
## algebra

what is the solution of the following linear system? -5x - 5y = -6 -5/2x - 5/2y = -6 a) none b) (-2,2) c)(-,2,-2) d) infinite number of solutions and the answer i picked was a or d thanks :)

*asked by poo on May 2, 2010* -
## algebra

what is the solution of the following linear system? -5x - 5y = -6 -5/2x - 5/2y = -6 a) none b) (-2,2) c)(-,2,-2) d) infinite number of solutions and the answer i picked was a or d thanks :)

*asked by poo on May 1, 2010* -
## algebra

what is the solution of the following linear system ? 8x + 3y = 1 x + 5y = 14 a)(2,3) b)(-1,3) c) none d) infinite number of solutions and the answer i picked was b thank you!!!!!!!!!!

*asked by poo on May 1, 2010* -
## Calc 2

Find the solution of the differential equation that satisfies the given initial condition. du/dt= (2t + sec^2(t))/(2u), u(0) = −4

*asked by TayB on March 29, 2016* -
## math

solve the system of equations algebraically for real values of x and y { x+y=16 x^2+y^2=128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

*asked by laura on August 29, 2016* -
## Chemistry

What mass, in grams, of sodium chloride is needed to prepare 15.0 ml of 10% (m/v) NaCl solution?

*asked by Irene on November 2, 2016* -
## chem

Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c

*asked by Help on April 28, 2010* -
## Trig

Find the general solution for the equation 4tanx+cotx=5?????? and the steps please? THANYOO!

*asked by Valerie on October 18, 2010* -
## Chem

I need to find the Kb of Analine. I've been told the ph is 8.81 and that the concentration of the solution is 0.1 mol/L. What would be the equation I'm working with :S ?

*asked by Lena on July 26, 2009* -
## Chemisrty

what mass of sodium phosphate is required to make 250mL of 0.10mol/L solution?

*asked by Jenna on February 22, 2010* -
## Rainy can you help me with this question?!

find the values of x and y that will make the matrix equal [x y] 1 9 = [3 5] 1 9 the answer options are a. x=-3 y=-5 b. x=5 y=3 c. x=-3 y=5 d. x=3 y=5 e. no solution

*asked by jessie on August 30, 2016* -
## math homework help please?!!

solve the system of equations algebraically for real values of x and y { x + y = 16 x^2 + y^2 = 128 a. (6,6) b. (8,6) c. (9,8) d. (8,8) e. no solution

*asked by ottilie on August 30, 2016* -
## chemistry

if 4.4 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

*asked by scott on November 21, 2011* -
## Chemistry

What is the pH of a solution obtained by adding 15 g deK2SO4em 150 ml NaHSO4 with Molarity of 0, 2 m. HSO4 Ka = 1, 3.10^-2

*asked by Arya on March 26, 2016* -
## math

list two congruence conditions for the law of sines yields a unique solution

*asked by carol on April 27, 2010* -
## SCIENCE

HELP ME!! EVERYONE IS MAD AT ME BCUZ THEY THINK I AM YELLING AT THEM BUT REALLY MY COMPUTER WILL ONLY DO BIG LETTERS! IF THERE IS A SOLUTION TO THIS PLEASE HELP ME. THIS IS NOT A JOKE.

*asked by SAMMI on October 4, 2010* -
## Science

Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

*asked by Kamal on April 29, 2013* -
## chemstry

What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?

*asked by michelle on November 15, 2012* -
## science

what volume of 0.115 M HClO4 solution is needed to neutralize 50.00 ml of o.o875 M NaOH?

*asked by yvaine on September 7, 2017* -
## biology/chem

How many grams of glucose (MW = 180 g) should we dissolve in one liter of water to get 1 molar solution?

*asked by nicole on January 19, 2011* -
## Chemistry

How would the freezing point of a solution change if the unknown had ionized or dissociated? Explain.

*asked by G on March 14, 2011* -
## chemistry

what is the PH of a solution containing .03 M of acetic acid and .3 mole of sodium acetate (CH3COONa) ? Ka for CH3COOH = 1.8*10^-5

*asked by mas on May 17, 2014* -
## Calculus

Solve the differential equation. t(dy/dt) + 2y= t^3 t>0, y(1)=0 I think I solved it properly, I'm just trying to check my final solution.

*asked by Rachel on February 15, 2011* -
## chemistry

What mass of KCl (MM = 74.55 g/mol) is required to make 550 mL of a 0.250 M solution?

*asked by Cassie on November 10, 2014* -
## chemistry

The concentration of a solution made by diluting 10.0 mL of 0.685 mol/L NaBr to 300 mL is

*asked by ronnie on March 16, 2015* -
## Chem

What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

*asked by IH on November 28, 2010* -
## Chem

What is the pH of the solution formed when 0.040mol NaOH(s) is added to 2.00L of 0.020M HCl?

*asked by IH on November 28, 2010* -
## Chemistry

What will be the molarity of the resultant solution obtained by mixing equal volumes of 1M and 5M ofNaOH.

*asked by Shivani on September 10, 2017* -
## Chemistry

Show, with equations, why the solution from which BaSo4 is precipitated cannot be allowed to be more then 0.01-0.05M in HCl.

*asked by Brittney on February 16, 2011* -
## science

when phenolphthalein is added to ammonium hydroxide the color of the final solution is pink?

*asked by kleanface on October 31, 2012* -
## chemistry

23 grams of NaOH is dissolved in 1.5L of water, find; a)Concentration of the solution b)pOH c)pH

*asked by Patrick on January 20, 2013* -
## chemistry

What mass of KCl (MM = 74.55 g/mol) is required to make 750 mL of a 0.275 M solution?

*asked by Brendon on November 10, 2014* -
## chemistry

How many grams of potassium permangate are needed to decolorized 1g of 2-pentene in basic solution

*asked by john on October 4, 2011* -
## chemistry

If you start out with a 0.4M solution of Histidine at pH 6 and add an equal volume of 0.1M HCl, what would the final pH be?

*asked by Ryan on February 15, 2011* -
## MATH ALGEBRA

How would u figure this question out? Does this system of linear equation have a solution of (-3,4)? 2x-3 = 6 y = 3x-13 Do u just substitute the numbers or something?

*asked by Anonymous on January 19, 2011* -
## Math

Is the (4, 1) a solution to the equation y = -x + 3? I honestly have no idea what this means. Does y = 4 and 1 = -x? If not then the answer should be no since (4, 1) is part of a graph

*asked by NotAFan on September 5, 2017* -
## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

*asked by AREEJ on November 30, 2012* -
## differential equations

dy/dx=4x/y..verify that the straight lines y=2x are solution curves, provided x doesnt equal 0.

*asked by siddh on January 9, 2013* -
## chemistry

what is the new boiling point for a solution prepared from 1.40 mol of KCI 1.00kg of water?

*asked by lkra on October 8, 2011* -
## Chemistry

Why is the solubility of KHTar greater in a 0.10M NaNO3 solution than in distilled water?

*asked by Becky on July 14, 2011* -
## chemistry

what mass in grams of sodium nitrate is needed to make 85.o ml of a 0.2500 m solution

*asked by andrew b on March 15, 2011* -
## Chemistry

What is the pH of a 0.085 M solution of nitrous acid (HNO2) that has a Ka of 4.5 × 10^-4? 2.21 5.33 3.35 4.42 I am not the best at working through the problems, but I came to A, 2.21, given the concentration and Ka.

*asked by Jameson on May 7, 2018* -
## Chemistry

How many grams of potassium carbonate are needed to make 0.200 L of a 2.50M solution?

*asked by Hannah on February 13, 2011* -
## chemistry

What mass of AgCl will be obtained by adding an excess of HCl to a solution of 0.34 g of AgNO3 ?

*asked by Joyeeta on December 18, 2014* -
## Chemistry

What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

*asked by Lucy on November 18, 2007* -
## math

What are the steps to the solution for this problem? What is the difference between 330 and half n equals 114?

*asked by Sandra on April 13, 2011* -
## Math

What are the restrictions on x if the solution to the equation -4 - square root 4-x=6 involves real numbers?

*asked by Alex on October 10, 2014* -
## Chemistry I

Determine the hydronium ion concentration in a solution that is 0.00018 M Ca(OH)2. Answer in units of M

*asked by Ashleigh on March 11, 2013* -
## college math

how many grams of NaOH are needed to make a 30% w/w solution using deionized water as the solvent

*asked by Wanda on November 28, 2010* -
## chem

What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175 M solution

*asked by whitney on April 12, 2011* -
## chemistry

What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?

*asked by Tom on April 20, 2011* -
## intergrated math

Solve the equation for x. Write the solution set 3x2 + 5x2 – x – 7x2 = 0

*asked by aj on May 17, 2011* -
## Chemistry

A solution that has an osmotic pressure greater than that of red blood cells is called?

*asked by Ann on November 29, 2010* -
## Chemistry HELP

If 150.0 mL of 1.00 M C6H12O6 are diluted to 750.0 mL, what is the molarity of the final solution? ____ M?

*asked by MBH on October 3, 2011* -
## Chemistry

How many moles of NH4Cl must be added to 1.5L of 0.2 M solution of NH3 to form a buffer whose PH is 9.(Kb=1.8x10^-5)

*asked by Zekariyas on December 7, 2017* -
## Pre-Calculus/Trigonometry

Solve the following system of equations algebraically. Verify the solution by using matrices. 8x-2y=5 -12x+3y=7

*asked by Anonymous on September 30, 2014*

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