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February 14, 2016

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: 57,502

Chem
Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) An experiment is performed to determine the volume of hydrogen gas produced when calcium reacts with excess HCl(aq) as represented by the net ionic equation above. A 0.0720 g sample of pure calcium and a solution of 1.0 M HCl(aq) were ...
April 23, 2013 by Jess

Chemistry
What is the ionic and net ionic equation for Na2CO3 + 2 HNO3 -> 2 NaNO3 + H2O + CO2 (g) This is what i have so far... Na2(aq)+CO3+H+NO3 -> Na+ NO3+ H2O(l)+CO2(g)... i don't know what to do!!!
November 3, 2009 by Christina

Chemistry
The combustion reaction of acetylene gas is represented by this equation: 2 C2H2(g) + 5 O2(g) ==> 4 CO2(g) + 2 H2O(g) How many grams of CO2 and grams of H2O are produced when 52.0g C2H2 burns in oxygen?
March 22, 2010 by Ralph

chemistry
Identify the acid/conjugate base and base/conjugate acid pairs for the following reactions H2CO3(aq) + H2O(l) <===> H3O+(aq) + HCO3 -(aq) C5H5N(aq) + H2O(l) <===> C5H5NH+(aq) + OH-(aq
April 28, 2011 by jake

AP Chem
(MnO40- + (C2O4)2- + H+ = CO2 + H2O + ? OR (MnO4)- + (C2O4)2-+ OH-=CO2 n+ H2O +? Can somebody please help me predict the products? I can balance it i just need help determining what to balance.
October 23, 2012 by Colin

Macroeconomic
Suppose the current interest rate is 12 percent and a bond with a face value of $500 that pays a coupon rate of 15 percent is selling for $450. Calculate the yield on this bond. How do I calculate the yield on this bond?
December 12, 2014 by Jessica

Chemistry
Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an endothermic or an ...
December 11, 2012 by Odesa

Chemistry
Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an endothermic or an ...
December 13, 2012 by Ling

Chemistry
A student weights 1.700 g of succinic acid and dissolves it in water in a 250.0 mL volumetric flask. A 25.00 mL sample of this solution is withdrawn and placed in a 125 mL Erlenmeyer flask, to which 5 drops of the acid-base indicator phenolphthalein is added. This solution is ...
October 26, 2014 by Mary

Finance
200- to 300-word description of the four time value of money concepts: present value, present value of an annuity, future value, and future value of annuity. Describe the characteristics of each concept and provide an example of when each would be used.
February 12, 2010 by Anonymous

Chemistry
In a laboratory, a student studies the absorption and transmission of light in order to analyze copper in brass and determine its percentage within the brass sample. He determines the amount of light absorbed by a sample by measuring the amount of light transmitted, all at a ...
April 1, 2009 by Jessica

math help pls pls
Two systems of equations are shown below: System A 6x + y = 2 −x − y = −3 System B 2x − 3y = −10 −x − y = −3 Which of the following statements is correct about the two systems of equations? The value of x for System B will be 4 ...
December 21, 2015 by Oscar

mcc
Larry bought a house for $220,000. After one year, its value appreciated (increased in value) by 15%. During the second year, its value depreciated (decreased in value) by 12% from its value at the end of the first year. What was the value of the house at the end of the second...
May 1, 2013 by Anonymous

chemistry
What is the percent ionization of 0.025 M chlorous acid, HClO2 solution? Ka HClO2 = 1.1*10^(-2) Answer: 48% What I did: HClO2(aq) + H2O(l) -><- ClO2(aq) + H3O(aq) initial-change-end table results: x^(2)/(.025-x)=1.1*10^(-2) x=1.6*10^(-2) % ionization = (1.1*10^(-2))/(1.6...
July 30, 2011 by % ionization

Chemistry
A zinc-copper battery is constructed as follows. Zn | Zn2+ (0.70 M) || Cu2+ (2.30 M) | Cu The mass of each electrode is 200. g. (a) Calculate the cell potential when this battery is first connected. 1 V (b) Calculate the cell potential after 10.0 A of current has flowed for 10...
March 29, 2009 by Amy

Chemistry
The combustion of propane (C3H8) in your BBQ occurs by the following unbalanced reaction: C3H8(g) + O2(g)  CO2(g) + H2O(g) If 34.0 mL of CO2(g) is collected, what volume of H2O(g) also could be collected under the same conditions?
November 6, 2013 by Anonymous

college chemistry
The value of the equilibrium constant (Kp) as represented by the first chemical equation is 4.57 x 10-2 at 395 C. Calculate the value of the equilibrium constant (Kp) for the second equation at the same temperature. Express answer in scientific notation. Cl2CO(g) = CO(g)+Cl2(...
October 3, 2010 by sparkle

Business Statistics
A chi-square test for independence with 8 degrees of freedom results in a test statistic of 18.21. Using the chi-square table, the most accurate statement that can be made about the p-value for this test is that: A) p-value < 0.01 B) 0.025 > p-value > 0.01 C) 0.05 >...
March 15, 2009 by Stuart

Chemistry
calculate the theoretical yield (in grams) of the solid product, assuming that you use 1.0 g FeC2O42H2O and that oxygen is the excess reactant. FeC2O42H2O (s) + O2(g) ---> FeO(s) + H2O(g) + CO2(g) Its balanced equation is 2FeC2O42H2O (s) + O2(g)----> 2FeO(s) + 4H2O(g...
October 14, 2010 by sonya

Chemistry
Thank you for your help. I did want to clarify why you are only calculating the Molar Mass for H2 and not the molar mass for H2O (or even H2O2). I'm not sure why you did this. Please clarify. See below: The following reaction represents the decomposition of hydrogen peroxide ...
October 19, 2010 by Andre

CHEMISTRY
Strong base is dissolved in 675 ml of 0.200 m weak acid (ka=3.25x10^-5) to make a buffer with a ph of 3.95. Assume that the volume remains constant when the base is added. HA + OH ---> H2O + A^- calculate the pka value of the acid and determine the number of moles of acid ...
November 10, 2011 by Alexander

chemistry
A 0.25 mol/L solution of benzoic acid, KC7H5O2 and antiseptic also used as a food preservative, has a pH of 2.40. Calculate the Ka of benzoic acid at SATP My work: C6H5COOH --> C6H5COO^- + H^+ Ka = (C6H5COO-)(H+)/ C6H5COOH I know my next steps are to use pH = log(H+) to ...
April 7, 2008 by Dustin

Chemistry
Based on the following balanced equation: 2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O a. How many moles of CO2 are produced after complete reaction of 8.00 moles of C4H10? b. How many grams of CO2 are produced after complete reaction of 8.00 moles of C4H10? c. How many moles of H2O ...
April 29, 2015 by Anonymous

chemistry
A scientist measures the standard enthalpy change for the following reaction to be -2923.0 kJ : 2C2H6(g) + 7 O2(g) 4CO2(g) + 6 H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2(g) is _________
October 24, 2012 by Anonymous

Finance
Write a 200- to 300-word description of the four time value of money concepts: present value, present value of an annuity, future value, and future value of annuity. Describe the characteristics of each concept and give an example of when each would be used
August 13, 2009 by Joseph

Finance
Write a 200- to 300-word description of the four time value of money concepts: present value, present value of an annuity, future value, and future value of annuity. Describe the characteristics of each concept and provide an example of when each would be used.
December 18, 2009 by Anonymous

Analytical chemistry
A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution until all the EDTA reacted, requiring 13...
April 4, 2013 by Ashley

Chemistry
How do you calculate the pH, pOH, [H3O] and [OH] for a 0.067 M solution of sodium iodate
April 14, 2008 by LT

Chem II
Calculate the pH of the solution made by mixing 35.0 mL of 0.500 M ca(OH)2 with 45.0 mL of 0.710 MHCl
April 16, 2008 by Ken

Chemistry
Calculate the solubility of silver chloride in a solution that is 0.140 M in NH3.
April 5, 2009 by Jack

Chemistry
Calculate the Ph of an aqueous solution that is 3.00% KOH, by mass, and has a density of 1.0242 g/ml.
August 5, 2009 by Anonymous

metro
Calculate the pH of the buffer solution that results when 10 mL of 0.10 M NaH2PO4 is added to 3 mL of 0.05 M NaOH.
March 17, 2010 by pat

Chemistry
Calculate the [H3O+] when 1.65 grams of KOH are dissolved in 500.0 mL of solution
May 12, 2010 by Amrita

chem
calculate the solubility of Ca(OH)2 in a 0.469M CaCl2 solution at 31 degrees C, Ksp of Ca(OH)2 is 4.96 X 10*-6
June 2, 2010 by Chloe

CHM
Calculate the solubility of Cu(oh)2 in grams per liters of solution if Ksp for Cu(OH)2 IS 4.8X 10^-20
June 27, 2010 by ami

science
Calculate the molarity of 500. mL of solution containing 21.1 g of potassium iodide
October 12, 2010 by kate

chemistry
Calculate the H+ concentration (M) of a 0.010 M solution of NH4Cl. Note that the Kb for NH3 is 1.8 e-5.
November 28, 2010 by cs

Chemistry
Calculate the molarity of a 5.4% sodium hydroxide solution whose density is 1.07 g/mL.
December 6, 2010 by anaymous

chemistry
Calculate the pH of a 0.800 M NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is
January 16, 2011 by noel

chemistry
Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5
March 15, 2011 by haley

chemistry
How do I calculate 50ml of a 50mM sodium momophosphate buffer solution
March 23, 2011 by PAUL

chemistry
how do you calculate grams of KCL in 3 litres of a 5% solution? (scientific notation)
May 12, 2011 by Denise

chem 150
calculate the molarity of 700grams of NaOH in 2 liters of solution
June 22, 2011 by nick

gp school
calculate the molarity of a solution when 5g of urea is dissolved in 600ml of water
August 20, 2011 by shiksha

Chemistry
Calculate the pH of 0.0115M acetic acid solution at 25 degrees celcius with Ka=1.75*10^-5
September 23, 2011 by Gift

chemistry
Calculate [H3O ], [ClO4], and [OH] in an aqueous solution that is 0.130 M in HClO4(aq) at 25 C.
October 20, 2011 by Sevy

Chemistry
Calculate the pH of a solution made with 0.240 M H3PO3 and 0.480 M NaH2PO3.
November 8, 2011 by Jessica

chemistry
Calculate the pH of an aqueous solution containing 1.6 x 10-2 M HCl, 2.0 x 10-2 M H2SO4, and 1.8 x 10-2 M HCN.
November 19, 2011 by alyssa

chemistry
Calculate the molarity of a 295 mL solution contain 45 g of ethanol (C2H5OH)
November 27, 2011 by jane

chemistry
calculate the freezing point of a .05500 m aqueous solution of NaNO3
February 12, 2012 by Cece

chemestry
Calculate [OH^ - ] for strong base solution: 14.0 mL of 1.2010−2 M Ca(OH)_2 diluted to 430.0 mL.
February 22, 2012 by chris

chemistry
Calculate pH for strong base solution: 15.0 mL of 1.2010^−2 M Ca(OH)2 diluted to 460.0 mL
February 26, 2012 by jeff

Chemistry
Calculate the pH of an aqueous solution containing 3.8 10-2 M HCl, 1.0 10-2 M H2SO4, and 3.3 10-2 M HCN.
February 28, 2012 by Brooke

Chemistry
Calculate the pH of an aqueous solution containing 3.8 10-2 M HCl, 1.0 10-2 M H2SO4, and 3.3 10-2 M HCN.
March 5, 2012 by Ashley

Chemistry
Calculate the [H+] in a solution containing 1.00 M hydroflouris acid (Ka=7.2 x 10^-4) and .50 M sodium fluoride
April 6, 2012 by Hannah

Chemistry
Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12
April 7, 2012 by Momito

Chemistry
Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12
April 7, 2012 by Momito

Chemistry
Calculate the mass of each compound containd in 60g of a 4.5%m/m CaCl2(aq)solution
April 27, 2012 by Victoria

Science
Calculate the pH of an aqueous solution containing 1.3 * 10^-2 M HCl, 3.0 * 10^-2 M H2SO4, and 2.0 * 10^-2 M HCN.
July 24, 2012 by Will Coppock

Chemistry
Calculate the H+ ion concentration if 0.20M NH3 solution is 2.5% ionized.
September 12, 2012 by charley

analytical chemisty
Calculate the pH and pOH of a 0.00002M solution of acetic acid.
September 23, 2012 by mary

Chemistry
Calculate the molarity of a 100. mL solution containing 22.3 g of sucrose (C12H22O11)
September 24, 2012 by Mariah

chemisty 2
Calculate the molarity (M) of a solution if you have 0.34 mol of NaOH in 19 ml of water
October 23, 2012 by chris

chemistry
calculate the mass of naso4 needed to prepare of 0.5L of 0.15M of solution
November 14, 2012 by elissa

Chemistry 1115
How do you calculate the molarities of HC2H3O2 and NaC2H3O2 in a buffer solution?
November 25, 2012 by Marci

Chemistry
Calculate the volume of 0.3MHCL used to neutralise NaOH solution
March 25, 2013 by Chris

Chem
Calculate [H3O ], [ClO4], and [OH] in an aqueous solution that is 0.170 M in HClO4(aq) at 25 C.
March 27, 2013 by Chris

Chemistry
Calculate the osmotic pressure at 22 C of a 0.25 M solution of a) dextrose, b) magnesium chloride.
May 24, 2013 by Mike

Chemistry 12
Calculate the mass of K2CRO4 needed to make 3.00 L of a 0.0200 M solution.
October 8, 2013 by Riann

Chem Help!
use the solubility product for Fe(OH)3 to calculate the pH at which Fe(OH)3 begins to precipitate from a 0.20 M Fe^3+ solution
April 9, 2014 by Anonymous.

Chemistry
Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
January 22, 2015 by Kat

AP CHEM
A solution formed by mixing 13.0 mL of 0.013 M Ba(OH)2 with 31.0 mL of 7.0 ✕ 10-3 M NaOH. Calculate [OH-]
February 17, 2015 by Jordyn

science
Calculate the ph of a buffer solution containing 0.2M NH4OH and 0.25M NH4Cl kb=1.810
February 18, 2015 by rupesh

science
Calculate the concentration of all species in a 0.145M solution of H2CO3
March 18, 2015 by Kris

Chemistry
Calculate the solubility of silver chloride in a solution that is .170M in NH3
March 30, 2015 by Gabby

college chemistry
Calculate the molarity (M) of 156.2g of H2SO4 in 1.275L of solution.
June 16, 2015 by Alicia Estrada

Chemisty
the Keq of Mg(OH)2 is 2(10^-11). calculate the concentration of Mg ions in a saturated solution of this compound
November 19, 2015 by Julian

chemistry
Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL
December 7, 2015 by derek

Chemistry
Another proposed mechanism problem: H2O2 + I ---> H2O +IO slow H2O2 + IO ---> H2O + O2 + I fast Which of the following statements in incorrect? a.) IO is a catalyst b.) I is a catalyst c.) The net reaction is 2H2O2 ---> 2H2O + O2 I would choose B, since IO is shown as...
February 19, 2013 by Marcus

AP Chem
For the system CO(g) + H2O(g)<-->CO2(g) + H2(g) Kp is 1.6 at 900 K. If 0.400 atm CO(g) and 0.400 atm H2O(g) are combined in a sealed flask, what is the equilibrium partial pressure of CO2(g)?
January 23, 2011 by Andrew

Stiochiometry
15.8 grams of NH3 and excess O2 produces NO gas and H2O. 12.8 grams of NO gas was produced. Find the percent yield. Balanced Equation: 4 NH3 + 5 O2 -> 4 NO + 6 H2O
May 15, 2011 by Mikey

First Year Chemistry
I have a question that I don't understand from my first year chem lab. Calculate the minimum volume of water needed to decompose all the excess Ethanoic Anhydride. Recall: 1.0g of H2O = 1.0 ml of water. How do I go about doing this?
March 11, 2012 by Joshua

CHEM
Calculate the vapor pressure at 25 C of hexane above the solution. The vapor pressure of pure hexane at 25 C is 151 torr. A solution contains naphthalene ({\rm{C}}_{10} {\rm{H}}_8) dissolved in hexane ({\rm{C}}_6 {\rm{H}}_{14}) at a concentration of 12.17 \% naphthalene by mass.
June 5, 2010 by AMI

Chemistry
Strong base is dissolved in 535 mL of 0.200 M weak acid (Ka = 3.16 10-5) to make a buffer with a pH of 4.04. Assume that the volume remains constant when the base is added. HA (aq)+ OH^-(aq) -> H2O(l) + A^-(aq) Calculate the pKa value of the acid and determine the number ...
February 19, 2015 by Stefanny Guerra

chemistry
I have 3 questions I need help with 1. mix 120ml of 0.320M silver nitrate with 40ml of 0.320M potasium chromate. What mass of silver chromate is produced? 2. Calculate the mass of white solid CaCO3 that forms when 98ml of a 0.1M Ca(NO3)2 solution is mixed with 54ml of a 2.5M ...
January 27, 2010 by Krissy

Chemistry
Use the following data 2C(s) + 4H2(g) --> C3H8(g) DH= -103.85 kJ/molrxn C(s) + O2(g) --> CO2(g) DH= -393.51 kJ/molrxn H2(g) + 1/2O2(g) --> H2O(g) DH= -241.82 kJ/molrxn to calculate the heat of combustion of propane, C3H8 C3H8(g) + 5O2(g) --3CO2(g) + 4H20(g)
November 12, 2015 by Anonymous

Chemistry
C. Consider the reaction 2C3H6 + 9O2 6CO2 + 6H2O. If the rate at which C3H6 is reacting is 0.40 mol liter−1s−1, then the rate at which 1. O2 is reacting is 1.6 mol liter−1s−1 2. CO2 is being formed is 0.40 mol liter−1s−1 3. H2O is being ...
September 19, 2015 by Jim

Chemistry
a) Calculate [H3O^+] in a 0.15M solution of benzonic acid, HC7H5O2(aq) having K of 6.4x10^-5. b) Calculate the per cent ionization of the HC7H5O2. I got.. A) 0.16M but i did it again and got 7.2M so i'm very stuck as to the very different answers i got. B) 12.4% ionization.
October 4, 2011 by Sarah

Dr. Bob Chemistry question
Ok this is what i got for the grams part now.... Total mass is 20.14 + 51.64 + 11.34 + 15.06 = 98.18 %H2O = (20.14/98.18)*100 = 20.51% %C2O4 = (51.64/98.18)*100 = 52.60% % Fe 3+ = (11.34/98.15) * 100= 11.55% % K + = (15.06/98.15) * 100 = 15.43 % 20.51 g H2O, 52.60 g C2O4 11.55...
May 5, 2008 by LT

Physics
A 35.41-g sample of Cu(s) at 96.73C was added to a constant-pressure calorimeter containing 148.3 g of H2O(l) at 25.20C. The final temperature of the system was 26.66C. Assuming no heat loss to the surroundings, what is the calorimeter constant? C(Cu) = 24.435 J/mol.K; C(...
September 25, 2012 by cry baby

chemistry
Problem#9: Consider the fuel octane (the main component of gasoline) and its combustion reaction 2C8H18(l) + 25O2(g) → 16CO2(g) + 18H2O(l) ΔHo = -10,942 kJ The fuel value of a fuel (unit kJ/g) is defined as the energy released when 1 g of the fuel undergoes ...
October 21, 2010 by Sarah

chemistry
when 1.40 g of hydrated magnesium salfate is heated to constant mass, 0.68 g of the anhydrous salt remains. find the formula for the hydrated magnesium sulfate. MgSO4*xH2O ==> MgSO4 + xH2O grams water = 1.40 - 0.68 = ?? mols H2O = ??/molar mass H2O. mols MgSO4 = 0.68/molar ...
March 17, 2007 by San

CheMistry
A stock solution was prepared by dissolving exactly 0.4000 g of pure ASA (180.16 g/mol) in 10.00 mL of NaOH and heating the solution to a gentle boil. After cooling to room temperature, the solution was poured into a 250-mL volumetric flask and diluted to the mark with DI ...
April 18, 2010 by ChEm

Maths
I got this question, and found what I believe to be the solution, but want it confirmed. I started with: log[base5](2x+1) + log[base5](x-1) = 1 And used the product law: log[base5]((2x+1)(x-1)) = 1 log[base5](2x^2-x-1) = 1 Then I changed to exponential form: 5^1 = 2x^2-x-1 5...
June 8, 2010 by anonymous

chemistry
Calculate the cell potential of a cell operating with the following reaction at 25C, in which [Cr2O72‾ ] = 0.030 M, [I ‾ ] = 0.020, M, [Cr3+ ] = 0.20 M, and [H+ ] = 0.60 M. Cr2O72-(aq) + 6 I ‾(aq) + 14 H+(aq) → 2Cr3+(aq) + 3 I2(s) + 7 H2O(l)
May 3, 2010 by Long

Biochemistry
1. Given the following equation: Glycerol-3-phosphate glycerol + Pi Go = -9.7 kJ/mol At equilibrium the concentrations of both glycerol and inorganic phosphate are 1 mM. Under these conditions, calculate the final concentration of glycerol-3-phosphate. Remember to convert kJ ...
February 11, 2013 by Angela

math
The value of a "Mint State-63" 1950 Jefferson nickel minted at Denver is 8/7 the value of a 1945 nickel at Philadelphia. Together, the total value of the two coins is $15. What is the value of each coin?
April 14, 2010 by zach

Science (chemistry) help please
The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. I don't know what to do? I know that 0....
May 14, 2013 by andy

Chemistry(Please check)
an acid with the equilibrium concentration is listed below: 1) HA + H2O = H3O^+ + A- HA= 10^-1 M, H3O=10^-3M, A=10^-3M Calculate the Ka and pKa for the acid. Ka=[10^-3][10^-3] / [10^-1] = 1.00 X 10^-5 pKa = -log[1.00 X 10^-5] = -1.00 Did I do this correctly for the Ka and pKa?
September 20, 2012 by Hannah

chemistry
Calculate values of for the following sparingly soluble solutes. Calculate value of Ksp for AgI (delta Gf(Ag^+)=77.11 kj mol^-1 , delta Gf(I^-) =-51.57 kJ mol^-1, delta Gf(AgI) =-66.19 kJ mol^-1).
December 2, 2012 by Allyx3

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