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December 2, 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: 62,224

Calculus!!
Consider the differential equation given by dy/dx = xy/2. A. Let y=f(x) be the particular solution to the given differential equation with the initial condition. Based on the slope field, how does the value of f(0.2) compare to f(0)? Justify your answer. B. Find the particular...
April 23, 2016 by Anonymous

Chemistry
2 H2S (g) + SO2 (g) <===> ƒnƒn3 S (s) + 2 H2O (g) 1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented below is -145 kilojoules. (a) Predict the sign of the standard entropy change, S¢X, for the reaction. Explain the basis foryour prediction...
April 29, 2008 by JJ

chemistry
An ideal solution contains 40 mole % of A and 60 mole % of B at 80 degrees C. The vapor pressure of pure A and B at this temp are 480 torr and 890 torr. Calculate the vapor pressure of the solution.
October 7, 2010 by Anonymous

chemistry
An ethylene glycol solution contains 18.2g of ethylene glycol (C2H6O2) in 85.4mL of water. Calculate the freezing point and boiling point of the solution. (Assume a density of 1.00 g/mL for water.)
November 19, 2014 by Anon

Chemistry
Calculate the concentration of chloride ions in the following solution. 73.28g of sodium chloride in 862. mL of solution. would it be 73.28g x 2 / 58.44g NaCl = 2.50 mol of Cl 2.50 mol Cl / .862 L = 2.91 M Cl
September 18, 2016 by Anonymous

Math
Determine the solution to the initial value differential equation: y′+2*y^2*e^(5*x)= 0 y(0)=2
October 21, 2009 by AK

algebra
I want to make sure that I understand how to do this problem. What is the value of x if 3/2x-2=15 + x? Would the solution be 2/9?
May 27, 2010 by anonymous

math
state the value of the discriminant and the discribe the nature of the solution 20x^2-8x-17=0
August 29, 2010 by marie

math
Use the intermediate value theorem to verity that x^4+X-3=0 has a solution in the interval(1,2)
October 10, 2010 by Anonymous

math
for each inequality tell whether the given value is a solution. a.x+8 > 15 x=4 b. 6x __<_ 30 x= -8 c. 4y-7<12 y=-1 d. z+2 _>__4+3z z=2
January 4, 2011 by kattie

algebra2
What is the value of x in the solution to the system y = 4x + 3 and 3x + 2y = -16? (Round to the nearest integer if necessary.)
February 1, 2011 by meghan

MATH
Find the solution of the given initial value problem. ty'+(t+1)y=t y(ln2)=0 t < 0
February 22, 2011 by ALEX

calculus
Please help find the solution to the initial value problem dy/dx=(1+2cos^2 x)/y with(y>0), and y=1 when x=0. Thanks.
April 29, 2011 by John

chemistry
What will be value of molarity and strength %w/v respectively 30V H2O2 solution
August 23, 2011 by Aayush

mathematics please help!
For what value of k does the system below not have a unique solution? -1x + 7y + 2z = 6 2x + 1y + kz = -11 3x - 6y - 2z = -25 A.5 B.0 C.-2 D.-8
July 22, 2012 by True

math help please
For the following system of equations, what is the x-value of the solution? –x + 2y = 6 6y = x + 18 A.-18 B.0 C.-6 D.3 I think its B??
November 24, 2012 by Deborah

Math
1. Is the equation true, false, or open? 4y 8 = 6y + 3 2. Which value is a solution of the equation 2 - 8x = -6? 3. Which ordered pair is a solution of the equation y - x - 4? 4. Which ordered pair is a solution of the equation y = 4x? 5. Which ordered pair is the solution of ...
November 29, 2016 by Robin Kwan

Chemistry (Check)
Completion. struggling with this....I got 1) 2)Precision 3)experimental value 4) 5) The ___1___ of a measurement describes how close the measurement comes to the true value. The ____2___ of a measurement depends on its reproducibilty. An ___3___ is a value measured in the lab...
January 14, 2007 by Bryan

Chemistry
Calculate DeltaHrxn for the following reaction: C + H2O --> CO + H2 Use the following: C + O2 --> CO2 DeltaH = -393.5 kJ 2CO + O2 --> 2CO2 DeltaH = -566.0 kJ 2H2 + O2 --> 2H2O Delta H = -483.6 kJ DeltaHrxn = ?
March 20, 2012 by Chemistry

Chemistry
The balanced equation for the decomposition of sodium bicarbonate is 2 NaHCO3 (s) --> Na2CO3 (s) + H2O (g) + CO2 (g)delta H 129.2. Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate.
April 30, 2013 by Laura

Chemistry
10.5g of zinc was heated to a constant mass and the residue treated with excess Hcl: ZnCo3+Hcl-----ZnCl2+Co2+H2O. Calculate the mass of zinc chloride that would be obtained
April 1, 2016 by Peace

Chemistry
K2O + H2O ==> ? KOH?? But it cannot be balanced. So would the product be KOH when K2O is dissolved in H2O? Thanks you!
May 31, 2009 by Anonymous

chemistry
what are the acids, bases, conjugated nacids and conjugated bases of the equation H2O+H2O->OH-+H3O?
May 5, 2011 by jacob

Chem
@20 degree solubility-22g Cu SO4/100g H2O @ 20 degree C is 6g Cu SO4/25 g H2O saturated?
December 2, 2011 by Tammy

chemistry
A sample of water is known to contain 1.51 × 10^24 H2O molecules. How many moles of H2O molecules are present in the sample?
March 22, 2016 by Dave

Organic Chemistry - Extraction
You have 100 mL of a solution of benzoic acid in water; the amount of benzoic acid in the solution is estimated to be about 0.30 g. The distribution coefficient of benzoic acid in diethyl ether and water is approximately 10. Calculate the amount of acid that would be left in ...
October 3, 2010 by Camille

Chemistry
The cell Pt|H2(1 bar)|HCl(m)|AgCl(s)|Ag has an Stadard elctrode potential value of 0.2224V at 298K Using the Nernst equation, calculate a value for the EMF when the HCl concentration is 0.20M. I know what the Nernst equation is but I am unsure how to use it when I only have ...
January 14, 2009 by Alice

Chemistry
CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 14.0 g sample of CaCl2 is dissolved in 130. g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat ...
November 10, 2007 by Joe

chemistry
A solution is prepared by mixing 0.0400 mol CH2Cl2 and 0.0800 mol CH2Br2 at 25 degrees C. Assume solution is ideal, calculate the composition of the vapor (in terms of mole fractions) at 25 C. At 25 C, vaporpressure of pure CH2Cl2 and pure CH2Br2 are 133 and 11.4 torr.
March 7, 2010 by Sara

Chemistry
A student mixes 100.0 mL of 0.300 mol/L silver nitrate solution with 100.0 mL of 0.300 mol/L calcium chloride solution. a) Determine the theoretical yield of the precipitate. b) If the actual mass of precipitate is 4.00g, calculate the percent error of this experiment.
January 8, 2011 by Rebekah

Chemistry
A student mixes 100.0 mL of 0.300 mol/L silver nitrate solution with 100.0 mL of 0.300 mol/L calcium chloride solution. a) Determine the theoretical yield of the precipitate. b) If the actual mass of precipitate is 4.00g, calculate the percent error of this experiment.
January 8, 2011 by Rebekah

Chemistry
One half-cell in a voltaic cell is constructed from a silver wire electrode in a .25 M solution of AgNO3 . The other half-cell consists of a zinc electrode in a .001 M solution of Zn(NO3)2. Calculate the cell potential I have no idea and am so stressed, Help please
November 18, 2015 by Anonymous

Chemistry(Please check)
I need to calculate the valueof Kc for 5 test tubes for an experiment that I completed on determination of Kc. The equation used was Fe^3+ + SCN^-= FeSCN^2+ After creating an ice table for the first test tube my values for Fe and SCN were 6.5e-4M and for FeSCN I got 5.7e-5M. ...
March 6, 2012 by Hannah

Algebra
2. Find the value of x^3 + 2x^2 - 3 when x=3 Answer-42 4. Compare the quantity in Column A with the quantity in Column B. Column A Column B The solution of The solution of 2(x-3) = 6x 3x + 2 + 5x + 6
August 7, 2011 by lizzie

Math help
1. Which value is a solution of the equation 5 - 4x = -3 0 2 -3 1/4 2. Which ordered pair is a solution of the equation y = x - 4 (2, 6) (6, 2) (-2, 6) (3, -1) 3. Which ordered pair is a solution of the equation y = 3x (-2, -9) (-8, -18) (-8, -3) (-10, -30) 4. Which ordered ...
October 15, 2013 by Charlotte

chemistry
When 0.752 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 12.2C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...
February 9, 2007 by nickel

Chemistry
An antacid tablet weighing 1.462 grams was dissolbed in 25mL of 0.8M HCl and diluted with water. The excess HCl was titrated with 3.5 mL of 1.019M NaOH solution. 1. Calculate the number of millimoles added to the tablet 2. Calculate the number of millimoles of NaOH required to...
July 1, 2010 by Daria

Chemistry
An antacid tablet weighing 1.462 grams was dissolbed in 25mL of 0.8M HCl and diluted with water. The excess HCl was titrated with 3.5 mL of 1.019M NaOH solution. 1. Calculate the number of millimoles added to the tablet 2. Calculate the number of millimoles of NaOH required ...
October 4, 2010 by Jennifer

Chemistry
How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass? percent by mass = grams/100 g solution. X grams/455 = 0.065 solve for X. Subtract 455-X to calculate how much water must be added. ok i got -454.935 is this right
February 6, 2008 by Lauren

chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps (assume volume is same ...
February 17, 2010 by anonymous

chemistry
Two aqueous solutions of sucrose, C12H22O12, are mixed. One solution is 0.1495 M sucrose and has d = 1.018 g/mL; the other is 12.00 % sucrose by mass and has d = 1.038 g/ml. Calculate the moles C12H22O12 percent in the mixed solution. Please provide steps (assume volume is ...
February 17, 2010 by anonymous

Chemistry
How many liters of gasesous methane (CH4) must be burned in oxygen to produce enough H2O and CO2 to fill a 3.0 L balloon? Assume that H2O and CO2 are the only combustion products and that the temperature and pressure remain constant. How would I solve this? Attempt: 3.OL (1 ...
August 29, 2010 by Amy~

math (is this worked correctly)
given that a=4,b=-2 and c=3 Calculate the value of a^2-bc/b+c answer=22
April 16, 2008 by Corina

Statistics
How do you calculate the value of z* and t* on the TI-84 and TI-89 (the number used in confidence intervals)?
March 30, 2010 by Bob

chemistry
Calculate the value of Kc for 4NH3(g) + 3O2(g)= 2N2(g) + 6H2O(l)
July 12, 2012 by mohamed

add maths
calculate the value of log square root p p^2.
May 3, 2014 by mandy

math
calculate the value of (1 sec20¡ã cot20¡ã)(1-cosec20¡ã tan70¡ã)
August 11, 2014 by Anonymous

Maths
If 192;x;y;3 form a geometric progression, calculate the value of x and y.
March 7, 2015 by Zikhona

Math
The side of retangular floor are xm and (x + 7)m.the diagonal is (x + 8)m,calculate the value of x
March 22, 2016 by Suraj

accounting
how to calculate depreciation using carrying value method?
April 23, 2016 by Jeylen

Maths
Given that 3^9 + 3^12 + 3^15 + 3^n is a perfect cube number. Calculate the value of n.
November 12, 2016 by Help

chemistry
Hey, I am having a real hard time getting the answers to the problems. Any help would be greatly aprreciated! 1. When 11 mL of a solution containing 2.9 M AlBr3 is diluted to 33 mL, a dilute solution is formed. What is the Br- concentration in 25 mL of the dilute solution? 2. ...
November 7, 2007 by chelsea

Finance
I need help on this study problem.----- A firm computes the probability distribution of possible net present values for a project and finds that it has an expected value of $125,000 and a standard deviation of $75,000. Assuming that the distribution of net present value is ...
November 2, 2006 by Jenny

Chemistry
This is a longer assignment. I want you to confirm my first two answers and help me figure out the last. 3 Cu (s) + 8 HNO3 (aq) → 3 Cu(NO3)2 (aq) + 2 NO (g) + 4 H2O (l) A copper penny with a mass of 3.067 g is dissolved in 100.0 ml of 1.000 M nitric acid. A. How many ...
January 6, 2015 by Morgan

Science
Help!! How many atoms in 3.45 mL of water? (H2O only;mL=g) and If you are out panning for gold and discover a nugget that is exactly 2.50 moles, how many molecules, atoms, and grams would you have? At a cost of $375 per ounce, what would be the value of gold?
October 20, 2010 by Jack

math
Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter your answer with the correct number of significant figures. 885.75 g + 10.151 g - 25.50 g Calculate the value of the following in exponential ...
September 23, 2010 by help?

Science
C6H5NH2 + H2O C6H5NH3+ + OH- 1. Aniline, a weak base, reacts with water according to the rxn above. a. A sample of aniline is dissolved in water to produce 25.0 ml of a .10 M soln. The pH of soln is 8.82. What is Kb for this rxn? b. The soln in part b, is titrated with...
April 12, 2008 by Francis

chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).
November 3, 2014 by eddie

statistics
The selling of prices Of six second hand bicycles in relation to their ages were noted for advertisements appearing in a local newspaper . The details are given in the table bellow. Age x ( years) 4 10 2 1 3 4 Price, y. 9 1 14 18 12 7 ( a) calculate the value of the product - ...
August 23, 2014 by blessed

Chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, don't leave a step out! Thank You!
November 3, 2014 by Joseph

chem
An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed? do I use the heat capacity equation? How much oxyen is used to produce 47...
February 14, 2007 by tina

Chem
4 NH3 + 3 O2 --> 2 N2 + 6 H2O a.) Assume 3.0 mol O2 completely reacts. Calculate the moles required for the other reactant. Calculate the moles that can be produced for each product. b.) Assume 8.0 mol NH3 completely reacts. Calculate the moles required for the other ...
February 13, 2016 by Deni

chemistry
For the equilibrium H2(g)+CO2(g)<-->H2O(g)+CO(g) Kc=3.18 at 1106 K.If each of the four species was initially present at a concentration of 3.000M,Calculate the equilibrium concentration of the CO (g) at this temperature. Choices 0.844 3.268 3.844 3.460 2.156 Thanks ...
May 9, 2010 by Andy

Chemistry
The combustion reaction for benzoic acid C6H5CO2H(s) + 15 2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hess’s Law to calculate ∆H0 f for benzoic acid.
October 7, 2012 by Austin

mixture problems
A chemist has two solutions of sulfuric acid. One is a 25% solution, and the other is a 50% solution. How many liters of each does the chemist mix to get 10 liters of a 40% solution? 25% solution L: 50% solution L:
November 21, 2014 by Kendall

SAT Math
Can I please get some help on these questions: 1. If , find the value of 2 square root of 17-x = 2x-10, find the value of x/4. 2. If absolute value of 3x+6 < 9, then which of the following is a possible value of x ? My answer choices are -7, 1, -5, -1, 10. When I solve for ...
June 1, 2013 by mysterychicken

maths
the value of a car depreciate by 13% of it value in the first year. in the subsequent year the depreciation is 8% of its value at the beginning of the year.the value of the car when new is $45000. find its value when it is four years old.
February 21, 2016 by fernando

Chem
Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is diprotic.
April 25, 2014 by Jen

Chem
Using the standardized NaOH solution, the student weighs out 0.2550g of a solid unknown acid and finds that 28.50mL of the NaOH solution is required to reach an end point with the acid. Calculate the molar mass of the unknown acid, assuming the acid is diprotic.
April 25, 2014 by Jen

Chemistry
Can someone confirm that I'd be doing this right? If an 0.520 m aqueous solution freezes at -3.00 C, what is the van't Hoff factor, i, of the solute? It says I can find the Kf values on a table. I had no idea which Kf value to use... so i just used water... is that right? If ...
February 16, 2012 by David

Chemistry help
I am confused as to how to solve the below problem. I am not sure which formula to use. At first I thought I calculate the molar mass of NaOH, followed by calculating moles of NaOH. But I don't have the mass of NaOH to calculate moles. Do I convert 10mL to grams to Be able to ...
March 15, 2012 by Julie

chem 1151
a 250.0 mL of solution contains 50.0 mL acetone and 45.0 mL ethyl alcohol and the remainder water. Calculate the % acetone, % ethyl alcohol, and water in the solution. Show calculations.
June 14, 2011 by ris

Chemistry
A solution is made by dissolving 26.7 g urea, a nonelectrolyte, in 301 g water. (The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.) Calculate the vapor pressure of this solution at 25°C.
May 6, 2015 by Jack

Chemistry
To calculate the percent error you would use the error in measurement divided by accepted value times 100 correct? So for an experiment in which you had to find the concentration of a dye in a powdered drink solution, to find the percent error would you use the number you ...
October 12, 2011 by Hannah

Chemistry- please check my work
Question: The following equilibrium was studied by analyzing the equilibrium mixture for the amount of HCL produced. LaCl3(s)+ H2O(g) goes to LaOCl(s)+2HCl(g). A vessel whose volume was 1.25L was filled with 0.0125 mol of lanthanum (III)chloride and 0.0250 mol H2O. After the ...
February 25, 2009 by eliz

Chemistry II
Acetone, C3H6O, is the main ingredient of nail polish remover. A solution is made up by adding 35.0mL of acetone(d=0.790g/mL) to 50.0mL of ethyl alcohol,C2H6O(d=0.798 g/mL). Assume that the volumes are additive. From this information calculate the molarity of acetone in the ...
September 27, 2009 by Mandy

Chemistry
(a) Explain what is meant by a weak acid. Methanoic acid (HCO2H) has a numerical value of Ka(T) at 298K of 1.60 × 10-4 (b) Write an expression for Ka(T) of methanoic acid, and state its units. (c) What is the pH value of a 0.10 mol dm-3 aqueous solution of methanoic acid? ...
April 22, 2012 by Henry

CHEM
A 0.552 g sample of ascorbic acid(Vitamin C) was dissolved in water to a total volume of 20.0 ml and titrated with 0.1103 M KOH. The equivalence point occurred at 28.42 ml. The pH of the solution at 10.0 ml of added base was 3.72. From this data, determine the molar mass and ...
March 21, 2012 by Cooper

chemistry
A student prepares a solution of hydrochloric acid that is approximately 0.1 M and wanted to determine its precise concentration. A 25.00 mL portion of the HCl solution is transferred to a flask, and after a few drops of indicator are added, the HCl solution is titrated with 0...
June 14, 2015 by walter

math
y′=(2y+x)/x, y(1)=4 1. The resulting differential equation in x and u can be written as xu'=------ 2.Separating variables we arrive at -----du= dx/x 3.Integrating both sides and simplifying, the solution can be written in the form u+1=Cf(x) where C is an arbitrary ...
February 29, 2016 by Leahv

Chemistry
1.) Watch the animation, and observe the titration process using a standard 0.100 M sodium hydroxide solution to titrate 50.0 mL of a 0.100 M hydrochloric acid solution. Identify which of the following statements regarding acid-base titrations are correct Drag items A-F to: ...
November 19, 2015 by LuigiR

accounting
On December 31, 2008, University Theatres issued $500,000 face value of bonds. The stated rate is 6 percent, and interest is paid semiannually on June 30 and December 31. The bonds mature in 10 years. Required: If required, round your answers to the nearest whole dollar. ...
July 20, 2011 by me

chemistry
How to find moles given oxidation numbers and chemical formula? Trying to do my chemistry lab but i'm super duper stuck. please help me i'm gonna die. this is the part i'm stuck on: The overall charge on the complex, [Ni(en)(H2O)]^2+ * SO4^2- * H2O is zero; the charge on ...
November 15, 2012 by dr bob's number one fan

chemistry
Calculate the pH of a solution (to 2 decimal places) which is 0.106 M in phenol, Ka = 1.0 x 10-10.
January 10, 2008 by caleb

Chemistry II
Calculate the freezing point of a 0.75 m solution of Al2(CO3)3.
September 16, 2009 by Chase

Chemistry
How to calculate the density and viscosity of a 10 % by wt salicyclic cid solution.
February 15, 2010 by arp

Chemisty
calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX
March 29, 2010 by Emily

chemistry
How would you calculate the concentration of an aqueous solution of Ca(OH2)that has a pH of 12.57.
April 14, 2010 by kia

chemistry
Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaC2H3O2?
May 6, 2010 by Julie

chemistry
Calculate the pH of a solution prepared by mixing 25.0 mL of 0.60 M HC2H3O2 and 15.0 mL of 0.60 M NaOH?
May 6, 2010 by Julie

chemistry
The density of 3M solution of NaCl is 1.25 g/mL. Calculate the molality of the soution.
May 10, 2010 by varsha

chemistry
Calculate the pH of the solution made by dissolving 8.00 g of lactic acid.
June 22, 2010 by Jay

chemistry
The pH of a solution is measured to be 5.4. Calculate the following: a) [H3O^+] b)pOH c)[OH^-]
June 28, 2010 by Jay

chemistry
Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).
October 20, 2010 by Helen

COLLEGE CHEMISTRY
Calculate the pH of a 0.052 NH4Cl aqueous solution
November 9, 2010 by shanice

chemistry
calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).
December 15, 2010 by Tara

Chemistry help plz
How to calculate the hydronuim ion cencentration of solution with a pH of 2.5?
December 23, 2010 by Tarkan

chemistry
A solution formed by dissolving an antacid tablet has a pH of 9.18. Calculate [H+].
January 20, 2011 by jaycab

Chemistry
Calculate the pH of a 0.250M solution of Sulfurous acid, H2SO3.
February 18, 2011 by Josh

chemistry
Calculate .200 mol sodium phosphate in 10.0 ml of solution
March 4, 2011 by Anonymous

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