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September 4, 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: 54,751

Chem
a solution of sodium hydroxide is standardized 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 1.054 g; buret reading before tiltration 0.33 mL; buret reading after ...
July 13, 2010 by debbie

AP Chemistry
A solution of sodium hydroxide is standardized 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 1.234 g; buret reading before titration 0.23 mL; buret reading after ...
September 14, 2011 by Chandler

CHEMISTRY
a solution of sodium hydroxide is standardized 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 1.404 g; buret reading before titration 0.13 mL; buret reading after ...
October 18, 2013 by maria

calculus
X. An automobile with seven years of use has a commercial value of $34057.7, but five years ago its value was $72250. If the value of such automobile varies exponentially with the time. (36-41) 36.- What was the value of the automobile when it was new? 37.- What will be the ...
November 25, 2008 by steve alexander

calculus
An automobile with seven years of use has a commercial value of $34057.7, but five years ago its value was $72250. If the value of such automobile varies exponentially with the time. (36-41) 36.- What was the value of the automobile when it was new? 37.- What will be the value...
November 25, 2008 by steve alexander

chemistry
DATA Empty Evaporating dish and watch glass: 33.6g Evaporating dish, watch glass and NaHCO3: 35.08g Evaporating dish, watch glass and product: 34.65 NaHCO3(s) + HCL (aq) ----> NaCl(s) + H2O(L) + CO2(g) 1. Determine the mass if the sodium bicarbonate reacted? 2. Calculate ...
November 13, 2008 by Mark

Chemistry
Nitrogen Dioxide , a pollutant in the atmosphere, can combine with water to form nitric acid. One of the possible reactions is shown here. Calculate delta ∆G and Kp for this reaction at 25C and comment on the spontaneity of the reaction. 3NO2(g)+H2O(l)--> 2 HNO3(aq...
March 29, 2012 by SANDY

Chemistry
The esterification of acetic acid and ethanol is given by the reaction below: C2H5OH(aq) + CH3COOH(aq)===>CH3COOC2H5(aq) + H2O(l) When 1.00 mol of ethanol was mixed with 2.00 mol of acid in a 1.00 L flask, 0.86 mol of ester was formed at room temperature. What is the value ...
March 4, 2010 by Bababab

chemistry
Which of the following is a precipitation reaction? I. 2 Mg (s) + O2 (g) → 2 MgO (s) II. SO3 (g) + 2 H2O (l) → H3O+ (aq) + HSO4- (aq) III. Pb2+ (aq) + CrO42- (aq) → PbCrO4 (s) IV. 2 H2O (g) → 2 H2 (g) + O2 (g) V. Ag+ (aq) + 2 NH3 (aq) → [Ag(NH3)2...
September 23, 2013 by sos

Chemistry
A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment, 0.1107 g of the compound was dissolved in 25.0 g of water. This solution had a freezing point of -0.0894 degrees C. what is ...
December 9, 2012 by sevag

Chemistry
A compound of carbon, hydrogen, and oxygen was burned in oxygen, and 2.00g of the compound produced 2.868 g CO2 and 1.567 g H2O. In another experiment, 0.1107 g of the compound was dissolved in 25.0 g of water. This solution had a freezing point of -0.0894 degrees C. what is ...
August 6, 2013 by Desz

Chemistry
Can you please help me write the oxidation and reduction half reactions represented in each of these redox equations, and help me write the half reactions in net ionic form if they occur in aqueous solution. 1) PbO(s) + NH3(g) --> N2(g) + H2O(l) + Pb(s) 2) I2(s) + Na2S2O3(...
August 24, 2015 by sydney

math
scientist is mixing a chemical solution for an experiment solution contains 3/8 of chemical solution 1/6 ounce saline solution what is the unit rate of chemical to saline solution? 3/8 x 1/6 + 3/48 divided by 3 + 1/16 is this right
March 16, 2015 by Joshiah

Chem
Calculate ΔG at 25C for the precipitation of lead(II) chloride from mixing 100. mL of 0.025 M lead(II) nitrate solution with 100. mL of 0.15 M sodium chloride solution. The ΔG for the reaction at 25C = −27.36 kJ/mol. (Hint: write out reaction equation also...
February 23, 2014 by Anonymous

chemistry/ molarity, molality
A solution is made by mixing 20.0 mL of C6H5CH3, d=.867g/mL, with 140.0mL of C6H6, d=.874g/mL. assuming that the volumes add upon mixing, what is the molarity? what is the molality? i know that molarity= moles/L and molality= moles sol/kg solvent... but im not sure which ...
April 3, 2007 by christine

ap chem
Acid rain has a pH value of 3.0, whereas normal rain has a pH value of 5.6. Calculate the ratio of the hydronium ion in acid rain to that in normal rain.
February 14, 2011 by Anonymous

ap chemistry
Acid rain has a pH value of 3.0, whereas normal rain has a pH value of 5.6. Calculate the ratio of the hydronium ion in acid rain to that in normal rain.
February 28, 2013 by cheri

science
Q4.you will be asked to prepare 25.0 mL of a 0.019 M solution of sodium chloride during this experiment.... a.calculate mass of sodium chloride needed to prepare solution. (0.25L)(0.019M NaCl/L)*(58.5g NaCl/1mole NaCl)=0.278 g NaCl....is that right? someone just replied it was...
September 17, 2009 by Ally

Chemistry
A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of fold in a 1.0 M gold (III) ion solution connected by a salt bridge. Calculate the standard potential for this cell at 25 degrees celcius.
October 9, 2012 by Morgan

Chemistry
Calculate the molarity of a solution made by adding 28.2 mL of concentrated ammonia (28.0 % by mass, density 0.880 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 500 mL of solution. (It is important to add concentrated acid or base to ...
October 7, 2013 by Sarah

chemistry
100.0 mL of a dilute NaCl(aq) solution is heated in an open beaker. After 15 minutes the burner is turned off. Which of the following is true of the resulting solution? a more concentrated than the initial solution b less saturated than the initial solution c less concentrated...
December 7, 2014 by jepow

Algebra
The value of a 1950 Jefferson nickel is 8/5 the value of the 1945 nickel. Together the value of the two coins is $91. What is the value of each coin?
November 24, 2010 by Tammie

math
two positive integers I larger value 32 j smaller 20 divide i by j which equal R if r not 0 then reset the value of j to the value of r when r equal 0 what the value of j?
May 3, 2011 by Anonymous

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
Pure acetic acid, known as glacial acetic acid, is a liquid with a density of 1.049 g/mL at 25C. Calculate the molarity of a solution of acetic acid made by dissolving 10.00 mL of glacial acetic acid at 25C in enough water to make 150.0 mL of solution.
February 17, 2010 by Mindy

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

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

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

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

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

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
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
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
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

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
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

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

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