# 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 164-
## Chemistry

a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb

*asked by Dawn on June 1, 2016* -
## Chemistry

Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.

*asked by Jematormal91 on April 5, 2012* -
## chemistry

0.947 moles of NaC2H3O2 dissolved in 100 mL solution

*asked by chem on April 16, 2015* -
## Chemestry

Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

*asked by Becky on November 23, 2012* -
## Algebra 1A

When graphing the inequalities 9x+8y

*asked by Kim on July 3, 2013* -
## Chemistry

when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution

*asked by Leah on April 17, 2011* -
## chemistry

how many kg of h20 must be added to 75.5g of Ca(NO3)2 to form a 0.500 m solution?

*asked by lynda smith on November 18, 2009* -
## Med lab tech

how many grams of KCL are required to make 5.0ml of a 35% w/v solution?

*asked by billie on November 27, 2010* -
## chemistry

What is the %v/v concentration of a solution made by adding 25 ml of acetone to 75 ml of water?

*asked by william on July 22, 2018* -
## Chemistry

What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0 X 10-15. a) 4.7 b) 7.2 c) 9.0 d) 9.1 e) 9.3 What should I do to solve for this? Thank you

*asked by Sheri on April 5, 2012* -
## chemistry

What is the final volume in milliliters when 0.700L of a 46.9% (m/v) solution is diluted to 20.1% (m/v)?

*asked by nancy on October 16, 2013* -
## math

find the genearal solution of the following equation 4csc^2x-7=cotx

*asked by beracah on May 20, 2016* -
## 5th grade

can a solution be made by mixing a solid, liquid and a gas?

*asked by Jon on October 7, 2010* -
## Science

In an acidic solution, why is the OH- concentration lower than it is in pure water?

*asked by Sheryl on October 22, 2011* -
## Science

The formula wt of h2so4 is98bthe wt of the acid in 400ml of 0.1M solution is

*asked by Anonymous on September 5, 2017* -
## biology lab

how many grams of mercury II Nitrate will you need to prepare 500mL of a .60 M solution ?

*asked by nicole on February 24, 2017* -
## Biology- PLEASE HELP ME ):

how does the salinity of a solution affect osmosis in an onion cell?

*asked by Kasey on March 1, 2011* -
## Saint Louis University

Let f(x,y)=sqrt((x-a)^2+(y-b)^2+(z-c)^2). Minimize f subject to Ax+By+Cz+D=0. what is the geometric meaning of your solution?

*asked by Micx on March 2, 2011* -
## Algebra

Write the solution set of the inequality |x + 2| < 5 in the interval notation.

*asked by Kim on September 30, 2014* -
## trig

Complete the general solution to y = arcsin -. y=____±2k IM lost please help

*asked by tracy on March 24, 2010* -
## math

use set-builder notation to describe the complete solution 5[3m-(m+6)]>-6(m-5)

*asked by jay jay on July 14, 2008* -
## Chemistry

Please check my work: What is the pOH of a solution containing [H+] = 1x10-11 M? log H=14-11 3 right

*asked by Jeremiah on May 3, 2016* -
## Chemistry

What is the density of a solution of 9.0% Calcium chloride dissolved in water?

*asked by Cassie on September 9, 2012* -
## chemistry

Foe Fe(OH)2, Ksp=8 x 10^-16. What is the molar concentration of OH- in a saturated Fe(OH)2 solution?

*asked by Michelle on December 18, 2009* -
## Math

How much milliliters must be added to 40 ml of a 10% acid solution to reduce its concentration to 4%?

*asked by Anonymous on June 24, 2016* -
## chemistry

A solution made from 19.0 g of NaBr and 500 mL of water has what molarity?

*asked by Cindi on May 4, 2011* -
## Maths

Solve the equation(GS general solution) 5sin^2x-3sinx-2=0

*asked by Ndaba on August 23, 2017* -
## Chemistry

What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.

*asked by Mark on October 20, 2011* -
## CHEMISTRY

how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

*asked by David on May 9, 2013* -
## chemistry

which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

*asked by Jamie on April 11, 2011* -
## Further Maths

Find the values of N for which the solution of the equations 3x+2y=Nx and 15x+4y=Nx is not unique

*asked by Adam on October 10, 2010* -
## CHEMISTRY

how would a chemistry student make a 600 mL of 1.5 M solution of NaBr?

*asked by David on May 9, 2013* -
## Physical Science

Milk is an example of a A.solution B.homogenous mixture C.colloid D.compound I think its a??

*asked by Chickenbreath on August 28, 2018* -
## calculus

Which of the following is NOT a solution to cos^2 x = 3sin^2 x? 30 60 150 210 330

*asked by philly on November 27, 2012* -
## Algebra: Check Answer

What are the solutions of the equation: x^2 + 14x = -130 ? a) 2, -16 b) 10, -13 c) -2, 16 d) no solution (~~ MY ANSWER d. ~~)

*asked by Breanna L. on February 24, 2016* -
## Chemistry-ish

What is the pH of a solution that has a OH- concentration equal to 1x10-5M? 14-x 14-5=9 can I use that simple of math 9?

*asked by Jeremiah on May 3, 2016* -
## Maths

How can it be possible for a set of inhomogeneous simultaneous equations to have no unique solution?

*asked by Alice on April 28, 2009* -
## Algebra

Graph the system below and write its solution. =+3xy−6 =y−−12x1

*asked by Anonymous on October 9, 2014* -
## chemistry

What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HC2H3O2(aq)? I got 1.3. is that correct?

*asked by ibob on April 29, 2009* -
## Chemistry

Balance in an acidic solution: S2O3^2- +OCL =CL^- +S4O6^2-

*asked by Genelia on May 5, 2011* -
## Math

1. Which of the following ordered pairs is a solution of the equation y=4x^2? (1 point) A. (-2, 16) ***My answer*** B. (1, -8) C. (0, -4) D. (2, -16)

*asked by Rylan on March 4, 2019* -
## science

determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

*asked by abby on March 9, 2011* -
## Chemistry

What mass of KBr is required to prepare 8.oo L of .400 M solution?

*asked by Nicole on September 10, 2012* -
## chemistry

which solution would have a high vapor pressure 6.0 M NaCl or 3.0 M LiCl?

*asked by Anonymous on April 11, 2011* -
## Algebra

Write the solution in interval notation x=-2. ) What would the compound inequality look like? Thanks for the help!

*asked by Ann on June 9, 2011* -
## Calculus-HELP PLZ !!!!

Find the complete general solution to the 2nd ODE: 9y'' + 9y' - 4y = 0

*asked by Elyse on July 22, 2013* -
## Science

Determine the molar concentration of Ca^2+ and Cl- in a .075 M CaCl2 solution

*asked by Moses on March 9, 2011* -
## Trigonometry half angles

Tan75/2 ka solution dena sir lekin vistar se

*asked by Ravi on August 15, 2017* -
## Chemistry

What is the pH of a 0.0054 molal solution of C2H2O4. First ionization constant K1= 6.5 x 10-2, second K2= 6.1 x 10-5.

*asked by James on March 24, 2010* -
## Chemistry

HNO3+NaOH --- H2O+NaNO3 What is formed in the solution besides Cu(OH)2?

*asked by Ashley on October 11, 2010* -
## CHEMISTRY

My question is that how can fe=fe(oh2)be balanced in a basic solution....THANKS IN ADVANCE.

*asked by Veronica on May 5, 2011* -
## Calculus

Find the complete solution to the 2nd ODE: 2y''+3y'+y=t^(2)+3sin(t)

*asked by Sara on July 18, 2013* -
## College Algebra

Change 2x^2-5x=25 to standard form. Then find the solution set.

*asked by Amanda on May 5, 2011* -
## chemistry

Which must be a mixture of substances? a- Solid b- Liquid c- Gas d- Solution

*asked by John on March 5, 2008* -
## Chemistry

What is the chemical reaction of urea with copper nitrate solution?

*asked by Ariro Mervin on March 9, 2019* -
## Chemistry

What is the purpose of adding distilled water to an HCl solution?

*asked by Lei on October 6, 2013* -
## chem

What is the pH in a solution that has a concentration of 4.5x^-3 M HCl rounded to the nearest hundredth?

*asked by Tyler Clark on April 12, 2012* -
## Math

1. Which of the following ordered pairs is a solution of the equation y=-4x^2? (1 point) (-2, 16) ***My answer*** (1, -8) (0, -4) (2, -16)

*asked by Rose on March 5, 2019* -
## calculus

find the general solution x^2-2(e^y)dy/dx = y^3+e(x^2) i am getting the y^3 dx when i do seperation of variables how do i deal with this.

*asked by brad on December 16, 2009* -
## maths

how can i find a general solution of g(x)when they give me g(X) =cos (x+30)and g(X)= -2sinx

*asked by mazandie Magaduzela on March 26, 2013* -
## Math

Is the ordered pair (0,0) a solution of the direct variation equation y=kx ?

*asked by Cassidy on December 13, 2012* -
## physical science

list two safety procedures to create a supersaturated solution

*asked by matthew on May 3, 2011* -
## chemistry

What mass of HCL is present in 0.80 molar, 2500mL solution?

*asked by Anonymous on October 6, 2014* -
## calculus

verify that y=C1e^2x + C2e^-3 is a solution of the differential equation y''+y'-6y=0

*asked by mari on April 10, 2012* -
## calculus plz help me

integrate:dx/((x-1)sqrt(x^2-2) plz show solution i plead

*asked by samuel on May 5, 2016* -
## algebra

find the real solution of the equation by graphing 6x^3-2x=-9x^2 i got 0.2,-1.7 is this correct

*asked by lee on November 26, 2012* -
## math

A=29 degrees, a= 5, b=13, How many solutions are there for triangle ABC and whats the solution(s)

*asked by lindsey on May 3, 2011* -
## science

determine the molarity of the following solution 31 g MgF2 in 55ml H20

*asked by willie on January 8, 2013* -
## science

determine the molarity of the following solution 31 g MgF2 in 55ml H20

*asked by willie on January 8, 2013* -
## Chemistry

There are 200 mmoles NaOH/400ml. What is the molarity of the solution?

*asked by Jessi on April 21, 2009* -
## Chemistry

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca(OH)2?

*asked by Kevin on June 20, 2016* -
## Calculus

Find the particular solution (solved for y) for the differential equation dy/dx=2x/e^(2y) satisfying y(0)=1.

*asked by Anonymous on April 9, 2015* -
## Math

If x = xo and x = x1 are both vector solution of Ax=b, then x1 - xo is in the Null Space of A. True or False?

*asked by Anonymous on September 7, 2012* -
## math

tell whether the point (9,3) is a solution of the inequality 4x-5y

*asked by maya on April 22, 2009* -
## Biology

How many grams of NaCl do you need to make 150ml of a 0.8M stock solution?

*asked by Keirra on September 8, 2012* -
## organic bio chemistry

how many mL of a 0.20M KOH solution is needed to neutralize 25 mL of 0.25 M H2SO4?

*asked by lisa on March 8, 2011* -
## Chemistry

What is the pH of a solution with [OH-] = 2.5 x 10-3? I don't even know where to begin with this problem :( You know [OH] + [H+] = 1*10^-14 so solve for [H+], then pH= -log [H+]

*asked by KHNJ on February 14, 2007* -
## Chemistry

How many grams of NaCL are required to make 250ml of a 0.4M solution?

*asked by Jessi on April 21, 2009* -
## calculus

find the general solution x^2-2(e^y)dy/dx = y^3+e(x^2) i am getting the y^3 dx when i do seperation of variables how do i deal with this.

*asked by brad on December 16, 2009* -
## chemistry

what is the mass of CuS04 needed to prepare a 125ml solution of 3.5M?

*asked by kjkajkjujo on March 7, 2011* -
## Chemisty

how many mole of calcium sulfate are in a 100mL of .86M solution?

*asked by Riley on November 26, 2012* -
## microeconomics

consider total cost and total revenue given in the table bellow: quantity total cost total revenue 0 $8 0 1 $9 8 2 $10 16 3 $11 24 4 $13 32 5 $19 40 6 $27 48 7 $37 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

*asked by sara on January 26, 2009* -
## Science.

Assume a typical hummingbird has a lifespan of 4.0 years and an average heart rate of 1300 beats per minute. (a) Calculate the number of times a hummingbird's heart beats in its life, and express it in scientific notation. Use 365.24 days per year. (b) A

*asked by Jeremy on August 21, 2012* -
## Economics

6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

*asked by SMsm on June 7, 2008* -
## Economics

. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

*asked by SMsm on June 7, 2008* -
## Economics

6. Consider total cost and total revenue given in the table below: QUANTITY 0 1 2 3 4 5 6 7 Total cost $8 $9 $10 $11 $13 $19 $27 $37 Total revenue 0 8 16 24 32 40 48 56 a. Calculate profit for each quantity. How much should the firm produce to maximize

*asked by SMsm on June 7, 2008* -
## I need HELP bad! Macroeconomics!

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal

*asked by Sarah on May 20, 2008* -
## Macroeconomics

1). Kelly purchased ten shares of Gentech stock for $200 in year 1 and sold all the shares in year 2 for $220 a share. Between year 1 and year 2, the price level increased by 5%. The tax on capital gains is 50%. If the capital gains tax is on nominal

*asked by Sarah on May 20, 2008* -
## Chemistry

(1)Aluminum reacts with oxygen to produce aluminum oxide according to the following reaction: 4Al(s) + 3O2(g) → 2Al2O3(s) Calculate the moles of Al2O3 produced when the reaction is performed with 31.06 g of each reactant. (2)Nitrogen dioxide reacts with

*asked by WCU cats on March 6, 2013* -
## Chemistry [back-titration] - please check my sol'n

A 7.00 gram sample containing the mineral tellurite was dissolved then treated with 70.0 mL of 0.03114 M K2CrO7. 3 TeO2 + Cr2O7 ^2- + 8 H+ -> 3 H2TeO4 + 2 Cr3+ + H2O When reaction is complete, the excess Cr2O7 2- required a 14.05 mL back titration with

*asked by Nina on March 19, 2014* -
## Chemistry

A student breaks a thermometer and spills most of the mercury (Hg) onto the floor of the laboratory that measure 15.2 m long, 6.6 m wide and 2.4 m high. a) (1 mark) Calculate the volume of the room in m3 and L. b) (2 marks) If the vapour pressure of

*asked by Anonymous on December 13, 2017* -
## Physics

A beam has a mass M and length L. A point mass m is located in distance d from the end of the beam and the point mass and the beam lies on the same line.a)Calculate the gravitational force of the beam on the point mass.b)Calculate the gravitational force

*asked by Amber on November 11, 2011* -
## chem

What is the pH of the solution created by combining 2.40 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? I understand how to find the pH for the NaOH + HCl solution. However, I'm not sure how to find it

*asked by Anonymous on May 2, 2011* -
## physics

A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.25 s after liftoff, the rocket clears the top of its launch platform, 69 m above the ground. After an additional 4.80 s , it is 1.00 km above the ground. Calculate the

*asked by aisha on March 5, 2012* -
## Chem (general)

Little confused on how to get part B. A) if 3.00g of hydrosulfuric acid is reacted with 3.00g of silver nitrate, calculate the mass (in g) of solid silver sulfide formed. Which is the limiting reactant? (Hint: the other product is nitric acid). B)

*asked by Sam on October 1, 2014* -
## Probability

Let X be a continuous random variable. We know that it takes values between 0 and 3 , but we do not know its distribution or its mean and variance. We are interested in estimating the mean of X, which we denote by h . We will use as a conservative value

*asked by qwerty on April 21, 2014* -
## chemistry

I have this long online lab that I am working on and I am stuck on converting Molarity then ultimately finding the % of phosphoric acid in the cola? There is all of different steps I went through with information but I am going to try to give only the info

*asked by Gweedo8 on July 3, 2009* -
## Physics

I have 3 different questions. 1) Calculate the coefficient of kinetic friction if it takes a force of 64 Newtons to keep a 54 kilogram box of books sliding across any icy surface at a uniform speed. 2) A car weighing 14,000 Newtons rests on a 20.0 degree

*asked by Dorothy on October 6, 2010* -
## Chemistry

Deriving Chem Beer's Law's Equation By comparing the absorbance of each trial solution, Aeq, to the absorbance of the standard solution, Astd, [FeNCS2+]eq can be determined. Two Beer’s Law equations can be written, one for the trial (Aeq =

*asked by Raskin on April 19, 2012* -
## physic

Can somebody shows me step by step with numbers on how to calculate the period for this question-equation. A black hole is an object with mass, but no spatial extent. It truly is a particle. A black hole may form from a dead star. Such a black hole has a

*asked by joy on February 23, 2018*

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