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July 6, 2015

Search: Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.

Number of results: 54,269

Math
( / means absolute value) Solve: 3+/2y-1/>=1. Graph the solution set on a number line. The number line I have is: -5 -4 -3 -2 -1 0 1 2 3 4 5 6 First solution: 3+2y-1>=1 2y-4>=1 2y>=5 y>=5/2 I'm stuck b/c I had to correct the first part. I had a whole different ...
February 24, 2008 by Jon

pre-calculus
solve the logarithmic equation. be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root of x+2=2 (If I try to make the square root sign it will not come out right so I wrote it out instead) What is the exact solution. A...
October 6, 2012 by ladybug

Chemistry
C2H5O2N is an important compound. The combustion reaction of glycine proceeds according to this equation: 4C2H5O2N + 9O2 ---> 8Co2 +10H2O +2N2 which is = -3857 kJ Given CO2 is -393.5 kJ/mol Given H2O is -285.6 Calculate the standard molar enthalpy of formmation of glycine.
November 8, 2011 by Izzie

chemistry
Lysine, an essential amino acid in the human body, contains C,H,O and N only. In an experiment, the complete combustion of 2.175 g lysine gave 3.94 g of CO2 and 1.89 g of H2O. In another reaction, the nitrogen content of 1.873 g of lysine is quantitatively converted to 0.436 g...
December 2, 2013 by helly

Chemistry
1.0L of aqueous solution in which [H2CO3]=[HCO3^-]=0.10M and has [H^+]=4.2E-7. What is the concentration of [H^+] ofter 0.005 mole of NaOH has been added? H2CO3 ==> H^+ + HCO3^- k1 = (H^+)(HCO3^-)/(H2CO3) I don't know if you are supposed to calculate or to look up k1. ...
August 7, 2007 by Vic

science
then how do u find: the volume of the H2O released, measured at 220 degrees C and 735mm Hg? What are you starting with? The volume of H2O released would depend on the original volume before being raised to that temperature. Please repost question with adequate data. I hope ...
March 28, 2007 by Anonymous

PHYSICS
Consider the circuit in Figure P32.17, taking script e = 6 V, L = 5.00 mH, and R = 7.00 . Figure P32.17 (a) What is the inductive time constant of the circuit? ms (b) Calculate the current in the circuit 250 s after the switch is closed. A (c) What is the value of the final ...
November 24, 2013 by Begging for help

chemistry
calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution.
October 14, 2007 by Rebecca

chemistry
Calculate the pH of the following aqueous solution: 1.00 mol/L sulfuric acid, H2SO4(aq)
April 5, 2008 by Bradely

Chemistry
Calculate the pH of concentrated hydrochloric acid if this solution is 24.8 % HCl by weight and has a density of 1.16 g/mL.
November 1, 2008 by A.A

Chemistry
I am sooo confused on how to solve this problem, can anyone help me understand? calculate the pH of 0.10 M HCI solution?
October 1, 2009 by Jessica

Chemistry
Calculate the [h3o+] of the following polyprotic acid solution: 0.135 M H2CO3
March 25, 2010 by Krysten

chemistry
Calculate the number of mL you would use to prepare 5.0 L of 0.20 M NaOH from a 5.23 M stock solution.
April 26, 2010 by laney

college
how do you calculate molar concentration for 1.50g NaCl in 100.00mL of solution?
May 17, 2010 by bernadette

chemistry
Calculate the pH of the solution that results from the mixture. 170 mL of 0.12 M C2H5NH2 with 285.0 mL of 0.22 M C2H5NH3Cl.
July 28, 2010 by Ellen

Chemistry
Calculate the molality of CsCl in a 6% by mass aqueous solution. Answer in units of m.
September 23, 2010 by Cheyenne

Chemistry
Calculate the molality of CsCl in a 18% by mass aqueous solution. Answer in units of m.
October 11, 2010 by Mike

chemistry
Calculate the mass of KI in grams required to prepare 7.00 multiplied by 102 mL of a 2.60 M solution
October 12, 2010 by Anonymous

Chemistry
Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?
October 24, 2010 by Anonymous

chemistry
Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?
October 24, 2010 by Anonymous

chemistry
Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.
November 15, 2010 by Audrey

Chemistry
Calculate [OH-] and pH for the following strong base solution: 10.0 mL of 0.0105 M Ca(OH)2 diluted to 500.0 mL
April 18, 2011 by Kendall

chemisty
calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water
April 27, 2011 by Anonymous

Chemistry
how do you calculate the pOH of a 0.25M solution of monochloroacetic acetic acid at 25C
May 11, 2011 by Illyana

chemistry
Calculate the number of moles of FeSO4 in 25cm3 of a 0.2mol dm3 solution
June 21, 2011 by Richard

Chemistry
calculate the pH and the pOH of an aqueous solution that is 0.035 M In HCI and 0.080 M in HBr?
July 23, 2011 by Josh

Prcts chemistry
Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka = 1.75*10^-5
September 22, 2011 by Gift

chem
calculate the molality of a solution of 2.34g acetic acid, HC2H3O2, in 35.0 g water
October 11, 2011 by michael

Chemistry
Calculate the solubility of AgCl in the following solution: 100mL of .004 M CaCl2
November 7, 2011 by Kevin

AP Chemistry
The solubility of solid Ce(IO3)3 in a 0.20 M KIO3 solution is 4.4 10-8 mol/L. Calculate Ksp.
December 4, 2011 by Bill

chemistry
Calculate the number of moles of each ion in 10.5 mL of 0.205 M cadmium phosphate solution.
January 22, 2012 by student

chemistry
Calculate the number of moles of each ion in 10.5 mL of 0.205 M cadmium phosphate solution.
January 22, 2012 by diana

chemistry
Calculate the grams of K2CO3 required to prepare 546.0 mL of a 0.789 g/L K+ solution.
February 15, 2012 by donald

Chemistry
Calculate the molality of a solution prepared by dissolving 31.6 g of Fe2O3 in 750. g of water
April 8, 2012 by Tina

Chemistry
Calculate the grams of solute required to make 2500mL of 90% saline solution?
May 17, 2012 by Morgan

gen chemistry
calculate the percent m/v concentration of a 5L solution containing 500g NaCl
May 18, 2012 by ashia3

College Biology
Calculate the concentration in Moles for a 5mgMgCl2 sample in 2L of solution. Then how many ions are in it?
September 9, 2012 by cutiepie

Chemistry
How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?
September 26, 2012 by John

Chemistry
Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25C.
October 6, 2012 by Alex

chemistry
calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
October 7, 2012 by mike

chemistry
calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
October 7, 2012 by mike

chemistry
Calculate the grams of solute needed to prepare each of the following. 55.0 ml of a 6.50 hcl solution.
November 2, 2012 by mary

Chem help
Calculate the pH of a solution containing 0.00001 moles of H3O per liter.
November 16, 2012 by Lindsey

Chemistry
Calculate the mass concentration of H2SO4 in a solution of 36%, with density 1.84g/cm3
January 20, 2013 by Anonymous

general chemistry
Calculate the molarity of each of the following solutions.70.8g C2H60 in 2.51L of solution
March 7, 2013 by kelia

Chemistry
7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.
March 20, 2013 by Nick

Chemistry
7. A solution is prepared by dissolving 8.5 g NaHCO3 and 12.7 g Na2CO3 in 500.0 mL of water. Calculate the pH.
March 20, 2013 by Nick

Chemistry
Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??
April 9, 2013 by Karen

Chemistry
Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??
April 9, 2013 by Karen

chem
calculate the concentration of all ions present in 58.7 mg NH4Br in 500 mL of solution
April 11, 2013 by celine

Chemistry II
Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.
May 3, 2013 by Katie

Chemistry
If 50 mL of a saturated solution of KClO3 at 55C is cooled to 15C, calculate the mass of precipitate that will form
May 20, 2013 by LOL

gpc
Calculate the molarity of a bleach solution that is 8% by mass (m/v) or 8g/100mL sodium hypochlorite.
March 3, 2014 by samry

Chemistry
Calculate the pH of the solution that results from mixing 30.0 mL of 0.050 M HCN(aq) with 70.0 mL of 0.030 M NaCN.
March 19, 2014 by Anonymous

chemistry
Calculate the molality of sulphuric acid solution in which mole fraction of water is .85
June 3, 2014 by swastika

chemistry
calculate the moles of solute present in 1.25 centimeter cube of 0.5 M h3po4 solution
June 19, 2014 by hifsa

CHEM
calculate the molality of a solution formed by dissolving 27.8g of LiI in 500mL of water
October 12, 2014 by Anonymous

chemistry
Calculate the pH of 0,3g calcium hydroxide dissolved in water to give 500ml solution.
October 26, 2014 by lala

organic biochemistry
Calculate the number of moles of ZnCl2, in 100. mL of 0.600M solution.
November 5, 2014 by hannah

Chemisty
calculate the concentration of the solution of 6.4g calcium sulafte is added to 0.125l of water
December 18, 2014 by EFonts

chemistry
Calculate the number of moles of each of the ions in the following solution: 30.8 mL of 0.507 M AlCl3
June 10, 2015 by walter

AP Chemistry
A solution is prepared by mixing 0.0200 mol CH2Cl2 and 0.0500 mol CH2Br2 at 25C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25C. At 25C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
March 22, 2010 by Sarah

chemistry
A solution is prepared by mixing 0.0433 mol CH2Cl2 and 0.0623 mol CH2Br2 at 25C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25C. At 25C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
May 4, 2010 by bob

Chemistry
A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0700 mol of CH2Br2 at 25C. Assuming the solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25C. At 25C, the vapor pressures of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr, ...
February 20, 2011 by Katrina

Chemistry
What is the equilibrium partial pressure of water vapor above a mixture of 37.5 g H2O and 62.5 g HOCH2CH2OH at 55 degree C. The partial pressure of water at 55 degree C is 118.0 mm Hg. Assume ideal behavior for the solution.
February 19, 2012 by Nurcan

Setting up a chem problem
Magnesium reacts with water in the equation, Mg+2HO-->Mg(OH)+H. You have 8.1 g of magnesium available. This means you will need ___ g of water to use all the magnesium. This seems sorta simple, but how can i set it up? These are stoichiometry problems. They can be solved...
January 18, 2007 by Briana

Chemistry
Given the information below, calculate the heat provided by combustion of 66.1g of propane (C3H8). ΔHf (C3H8(g)) = -103.85 kJ ΔHf (CO2(g)) = -393.5 kJ ΔHf (H2O(ℓ)) = -285.8 kJ Can Someone explain this in detail? i have to answer this type of problems on...
November 6, 2012 by bOB

chemistry
The combustion of a compound CxHyOz yields CO2 + H2O; all of th carbon in the CO2 came from the compound, all of the hydrogen in the H2O came from the compound; and all of the oxygen in the H2O came from the compound. The oxygen in the CO2 came from the atmosphere.
November 5, 2012 by Anonymous

chemistry
1)The element nickel has ccp packing with a face-centered cubic unit cell. The density of nickel is 8900 kg/m3 and the cell volume is 4.376 x 10-23 cm3. Calculate the value of Avogadro's number to three significant figures based on these data. (Note: the value may differ from ...
February 4, 2010 by blasting

science
In the lab you need to make 1.00 L of a 0.300 M NaCl solution. You had previously made a 0.950 M NaCl solution that you can dilute to form your new solution. How many mL of the concentrated solution would you use to make the dilute solution?
November 2, 2011 by liz

Chemistry
A solution is prepared by dissolving 25.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 700 mL of solution (the final volume). (a) What is the pH of the solution? (b) What would the pH of the solution be if 65.0 mL of 0.650 M NaOH were added? (c) What would the pH be if 40.0 mL ...
February 21, 2015 by Dean

Chemistry
If 48.1 g of solid Al2S3 and 6.68 mL of liquid H2O are reacted stoichiometrically according to the balanced equation, how many grams of solid Al2S3 remain? Al2S3(s) + 6H2O(l) → 2Al(OH)3(s) + 3H2S(g) I found that the limiting reagent, .6406mol of Al2S3 and .1226mol of H2O...
June 4, 2010 by Judy

chemistry
if the pH of a half-neutralized acid solution is 5.4, how would you find the [H+] of the the solution. There is 1.0 g of L-ascorbic acid which was dissolved in 100 ml of water. That solution was split in two and 50 ml of the solution was titrated with 0.2 M NaOH (13 ml NaOH). ...
April 17, 2008 by tom

Chemistry HELP!
In order to standardize a KMnO4 solution, 0.3498 g Na2C2O4 was dissolved in 30 mL water and 15 mL 3.0 M H2SO4. The KMnO4 solution was added to the Na2C2O4 solution until a pale pink color persisted. The titration took 29.5 mL of KMnO4 solution. What is the concentration of the...
May 6, 2013 by Prue

Chemistry HELP!
In order to standardize a KMnO4 solution, 0.3498 g Na2C2O4 was dissolved in 30 mL water and 15 mL 3.0 M H2SO4. The KMnO4 solution was added to the Na2C2O4 solution until a pale pink color persisted. The titration took 29.5 mL of KMnO4 solution. What is the concentration of ...
May 6, 2013 by Prue

Math
1. In the lab, Deon has two solutions that contain alcohol and is mixing them with each other. Solution A is 40% alcohol and Solution B is 12% alcohol. He uses 1000 milliliters of Solution A. How many milliliters of Solution B does he use, if the resulting mixture is a 32% ...
May 2, 2014 by Amy

Calculating Chi Squared
I did a biology experiment and I have to use the chi^2 method to calculate statistical significance. I got data at different time points and I just want to make sure what I'm calculating this right. The data I got for one time point are 6 and 23 I know the equation for chi^2 ...
October 28, 2011 by Catherine

Chem
You've just prepared a solution by transferring 20.0 g of glucose into a 1.0 - L volumetric flask, and adding water to the mark. Calculate the concentration of the glucose solution in terms of millimoles/Liter, mg/mL, and % (m/v). Ok, I think i'm overwhelmed by the wordinng of...
September 7, 2009 by Britt

urgent i need help within an hour!
Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. A solution containing 83.3 g of ascorbic acid dissolved in 210. g of water has a density of 1.23 g/mL at 55C Calculate the molarity of ascorbic acid in this solution. i got 2.77 but its wrong
January 21, 2013 by Samantha

AP chemistry
A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.894 g; buret reading before titration 0.13 mL; buret reading after ...
October 24, 2010 by Anonymous

Chemistry
A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.654 g; buret reading before titration 0.23 mL; buret reading after ...
October 4, 2011 by Broy

chemistry
A solution of sodium hydroxide is standard- ized against potassium hydrogen phthalate (KHP, formula weight 204.2 g/mol). From the following data, calculate the molarity of the NaOH solution: mass of KHP 1.744 g; buret reading before titration 0.13 mL; buret reading after ...
September 19, 2012 by cheri

Analytical chemistry
A 24.393 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 80.601 g of water. A 12.404 g aliquot of this solution is then titrated with 0.1059 M HCl. It required 31.61 mL of the HCl solution to reach the methyl red ...
April 4, 2013 by Ashley

math
given that R= 2p(squared) divided by Q-3 1)Calculate the value of R when P=6 and Q=12. 2)rearrange the formula to make Q the subject.
April 7, 2008 by scott

Algebra 2/trig
How would I calculate the following function value? tan = 29degrees 36feet
May 15, 2010 by Brenna

Calculus
Use Newton's Method with the function f(x)=x^2-2 and initial value Xo=2 to calculate x1,x2,x3. I have no idea how to do this
October 27, 2010 by Don

Math
Given that f(x) = a log x for some constant a, and that f(7)  5:282, determine the value of a and calculate f(13) to 3 decimals.
February 10, 2011 by Diane

math
How do I calculate the present value on a deferred annuity for $75,000 for 3 years at an interest rate of 7%.
March 25, 2012 by cathyj

Chemistry
Calculate the solubility of cadmium sulfide, CdS, in mol/L, given the Ksp value as 8.0 x 10^-27.
April 9, 2012 by Anonymous

trig
Given that cos A = 5/13 and A and B are both acute angles, calculate the value of Sin2A and Cos2A
June 6, 2014 by uche

maths litle
calculate the value of 14000after2years if it is invested at 12%per year simple interest
October 22, 2014 by nkanyiso

math
Calculate the mean value for the number of heads appearing in a simultaneous throw of 3 coins.
March 21, 2015 by gourav

Chemistry
A solution of NaOH(aq) contains 7.7 grams of NaOH in 93 mL of solution. Calculate the pH at 25◦C. ---- 7.7 grams x (1 mol/39.997 grams) = 0.19 mol 0.19 mol/0.093 L = 2.07 M pOH = -log(2.07) = -0.316 ---- Am I doing anything wrong? Why am I getting a negative pOH/pH ...
February 11, 2015 by Edwin

Chem
There are three questions in particular that I am having problems with. Here they are 1. A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard ...
January 19, 2009 by Mark

math
A group of people planned to contribute equally towards a water project which needed Ksh 200,000 to complete, however, 40 members of the group without from the project. As a result, each of the remaining members was to contribute Kshs 2,500. (a) Find the origina number of ...
February 21, 2015 by kudu

chemistry
220 ml of an HCl solution that is 31.4% by mass is required to neutralize .50 gal of the chlorine solution. what is the molarity of the OH- of the clorine solution? chlorine solution is NaOCl in NaOH
April 19, 2011 by Bob

college algebra
a chemist needs to prepare 28 ounces of a 8% hydrochloric acid solution. find the amount of 14% solution and the amount of 7% solution he should mix to get this solution.
April 20, 2015 by anna

Buffer Solution
You have 500.0 mL of a buffer solution containing 0.30 M acetic acid (CH3COOH) and 0.20 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 93 mL of 1.00 M NaOH solution?
April 13, 2011 by Nicole

Science
You have a stock solution of 3.5M glucose. You need a working solution of 0.5M glucose in a volume of 400ml. Explain how you make the solution. Also what is the concentration of the dilution solution?
October 15, 2012 by Helper

cal
Use Euler's method with step size0.4 to estimatey(2) , where y(x) is the solution of the initial-value problem y'=4x+y^2, y(0)=1. . y(2)=
March 12, 2012 by carlton

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