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July 23, 2014

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: 31,811

chemistry
During an experiment, a student adds 1.23 g of CaO to 200.0 mL of 0.500 M HCl. The student observes a temperature increase of 5.10 C. Assuming the solution\'s final volume is 200.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.184 J/(gC), calculate the heat of ...
June 26, 2013 by imstupid

Chemsitry
During an experiment, a student adds 1.23 g of CaO to 200.0 mL of 0.500 M HCl. The student observes a temperature increase of 5.10 C. Assuming the solution\'s final volume is 200.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.184 J/(gC), calculate the heat of ...
June 26, 2013 by imstupid

Math
Describe the number of solutions for the equation. 13. 3(x 3) = 3x (1 point) one solution no solution infinitely many solutions 14. 2(y 3) = 2y 6 (1 point) one solution no solution infinitely many solutions
January 18, 2013 by plz help

chemistry
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken, the ammonium nitrate dissolves according to the following endothermic reaction: NH_4NO_3(s) rightarrow NH_4...
December 19, 2012 by savannah

Chemistry
Phthalic acid, H2C8H404, is a diprotic acid used in the synthesis of phenolphthalein indicator. Ka1= 1.2x 10^-3, and Ka2 = 3.9 x 10^-6. a) Calculate the hydronium-ion concentration of a .015 M solution. b) What is the concentration of the C8H4O4^-2 ion in the solution? I don't...
April 2, 2007 by Rachael

Chemistry;
for a solution of the weak base, 0.075 M ethylamine C2H5NH2(aq), the hydroxide ion concentration (OH-) is 6.6x10^-3 M. Assume that temperature is constant and volumes are additive. a. Write the equilibrium dissociation equation. b. What's the pH of 0.075 M C2H5NH2(aq)? c. What...
January 27, 2011 by Sharon

Chemistry
Can someone please help me out here? I've tried several times and i keep getting the wrong answer :( lol A small crucible is filled with 100.00 mL of n-hexadecane (MW (226.44 g/mol), density (0.7703 g/mL)) and 2.10 L of 7-octenyltrichlorosilane (MW (245.65 g/mol), density (1....
January 21, 2013 by Tawnya

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 29, 2008 by david

Chemistry
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 30, 2008 by david

Physics
A trunk of mass m = 1.100 kg is pushed a distance d = 32.0 cm up an incline with an angle of inclination theta = 26.0 by a constant horizontal force P = 150. N. The coefficient of kinetic friction between the trunk and the incline is 0.330. a) Calculate the work done on the ...
October 19, 2012 by Steeve

chemistry
1. Find the pH of a solution whose [H3O+] is 9.5 X 10^ -8 M. 2. What is the [H3O+] concentration of a solution with a pH of 5.45? 3. What is the pOH of a solution with a [OH -] concentration of 2.97 X 10^ -10 M?
May 14, 2012 by kellin

chemistry
Reaction: CaCO3 + 2 HCl -> CaCl2 + CO2 + H2O Calculate the molarity of hydrochloric acid solution if an initial mass of 4.568g of CaCO3 was reacted with 25.0mL of the acid and 2.678g of CaCO3 remain after the reaction is complete.
November 30, 2012 by Jody

physics
Rotating blade (body force in axial loading) A blade is fixed to a rigid rotor of radius R spinning at omega(w) rad/sec around the vertical z axis, neglect the effect of gravity, calculate the peak stress in the blade calculate the blade elongation. calculate the displacement ...
May 1, 2013 by mehwish

chemistry
A 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, C6H6. The freezing point of the solution is 4.53 oC. Calculate the molar mass of the substance. The normal freezing point for benzene is 5.53 oC and Kf is 5.12 oC/m.
February 9, 2010 by CC

chemistry
A 0.750 g sample of an unknown substance is dissolved in 20.0 g of benzene, C6H6. The freezing point of the solution is 4.53 oC. Calculate the molar mass of the substance. The normal freezing point for benzene is 5.53 oC and Kf is 5.12 oC/m.
February 9, 2010 by CC

Chemistry
1) Calculate the amount of sodium chloride, NaCL (mol wt 58.44) and potassium chloride; KCL (Mol wt 74.56) needed to prepare 500 ml of 1.25 NaCL/10 mM kcl solution dilutions in water.
December 6, 2011 by Daniel

chem engineering
Mass balance on an intravenous injection (IV) bag A nurse sets up an IV drip for a patient consisting of normal saline; assume that this is an aqueous solution containing 150mM salt. The saline drip is supplemented with an antibiotic solution; assume that this is an aqueous ...
October 28, 2009 by Christina

Chemistry
An iron ore sample was dissolved in hydrochloric acid and the iron was obtained as Fe2+(aq). The iron solution was titrated with 38.54 mL of 0.471 M Ce4+ solution according to the balanced chemical equation below. Ce4+(aq) + Fe2+(aq) -> Ce3+(aq) + Fe3+(aq). Calculate the ...
March 11, 2009 by Bob

Mathematics
(in this question they did not give me any diagrams) use pie 22/7 (a) a piece of wire is bent to form a square of area 121cm squared Calculate the length of each side of the square. Calculate the perimeter of the square. (b) the same piece of wire was bent to form a circle. ...
June 5, 2012 by INDIANA

chemistry
The pH of saturated Sr(OH)2 (aq) is found to be 13.12. A 10.0 mL sample of saturated Sr(OH)2 (aq) is diluted to 250.0 mL in a volumetric flask. A 10.0 mL sample of the diluted Sr(OH)2 (aq) is transferred to a beaker, and some water is added. The resulting solution requires 26....
March 28, 2010 by anonymous

Physics
1. Planet X orbits the sun with a mean orbital radius that is 6200 times that of earth. Its diameter is twice that of earth, and its mass is 8 times that of earth. A) Calculate the year of the planet X. B) Calculate the acceleration due to gravity on planet X. C) Calculate the...
April 22, 2009 by Sandhya

Chemistry
4. A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. It took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) Calculate the volume of HCl neutralized by the NaOH. b) Calculate the amount of HCl (in mL) neutralized by...
April 2, 2013 by Josh

Chemistry ASAP
the concentration of Ag+ in a saturated solution of Ag2Cro4 is 1.6x10^-4 M. what is the Ksp value for Ag2Cro4? the solubility of BaCO3(s) in water is 4.0X10^-5 M. Calculate the value of Ksp for BaCO3
May 18, 2010 by Anonymous

chemistry
calculate the weight of crystal formed on cooling 80 gm of saturated solution from 60 degree Celsius to 30 degree Celsius. solubility of salt at 60 degree Celsius and 30 degree Celsius are 132 and 95 respectively.
November 23, 2010 by hey

chem
Calculate the volume of 0.200 M acetic acid and the volume of 0.100 M sodium acetate required to make 200.0 mL of a buffer solution with pH = 5.00. The Ka for acetic acid at 298 K is 2.00 x 10-5.
April 4, 2011 by chem

chemistry
Assignment 1 Question Consider a monohydrogen phosphate ( HPO42-) and dihydrogen phosphate (H2PO4-) buffer solution. [HPO42-] = 0.063M [H2PO4-] = 0.10M What happens when you add 1.0 ml of 0.10 M HCl to the a 99ml solution? What would the pH of the solution be without the ...
January 26, 2013 by anonymous

chemistry
If you wanted to standardize an approximately 0.1 M solution of hydrochloric acid by titrating 10.00 mL (delivered from a pipet)with approximately 30mL of sodium hydroxide solution (delivered from a buret), what should be the approximate concentration of the sodium hydroxide ...
April 22, 2010 by Peter

Chemistry
1000 g of a 50% (mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution? Please show me the detail answer
October 29, 2011 by Dewa

Chemistry
1000 g of a 50% (mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution. How many liters of water should be added to the starting solution? Please show me the detail answer
October 29, 2011 by Dewa

chemistry
You extract the iron from a tablet and dilute that to 600.0 ml in a volumetric flask. You transfer 0.600 ml of this solution to a 75.0 ml volumetric flask and dilute this to volume. When you measure the concentration of this solution, you find that it is 3.78 mg Fe/L (ppm). ...
March 28, 2012 by leigh

chemistry
Suppose that 50mL of a solution of sulfuric acid of unknown concentration was titrated with a 0.100M solution of sodium hydroxide. If it took 45.5 mL of titrant to reach the equivalence point, what was the concentration of the unknown solution of sulfuric acid???
July 7, 2013 by Coach

chemistry
A solution of acetic acid is prepared in water by adding 11.1 g of sodium acetate to a volumetric flask and bringing the volume to 1.0 L with water. The final pH is measured to be 5.25. What are the concentrations of acetate and acetic acid in solution? (Assume that the ...
January 23, 2011 by medina

Chemistry - help please
In an experiment, when 25 mL of 5.5 x 10^-3 M NaOH is mixed with 30 mL of 7.5 x 10^-3 M Fe(Br)2, a hydroxide compound is formed (Ksp = 1.8 x 10^15). Which of the following describes the resulting solution? a. The product is unsaturated b. The mixture product is saturated c. ...
October 15, 2013 by Eren

Chemistry: ketone and aldehydes
Q1. What will be formed when propanone reacted with sodium hydrogensulphite? There is white precipitate is the resulting solution . Is it sodium carbonate? Q2. What are the difference in the products bewteen the reaction of ethanal and propanone reacting with 2,4-...
November 29, 2008 by david

Chemistry
The molarity of Sr2+ in a saturated solution of SrSO4 was determined to be 0.000500 M. Calculate the solubility product constant (Ksp) for SrSO4. SrSO4(s) = Sr^2+(aq) + SO4^2- (aq) Molar Mass (g/mol) SrSO4 183.68 This is what I know: Ksp = [Sr][SO4]
March 31, 2010 by Angel

chemistry
For the titration of 50.00 mL of 0.1000 M ammonia with 0.1000 M HCl, calculate the pH (a) before the addition of any HCl solution, (b) after 20.00 mL of the acid has been added, (c) after half of the NH3 has been neutralized, and (d) at the equivalence point.
April 11, 2012 by chamy

chemistry
15.0 mL of 8.00 M NaOH was diluted with water to 500 mL. Calculate the molarity of the diluted NaOH solution. My calculations: 0.015L x 8.00moles/1L x 39.997/1mole = 4.8g M= (4.8g x 1mole/39.997) / 0.500L = 0.24M is my workings correct? Is there another way to get to this?
April 22, 2013 by alex

Chemistry
3.a solution has 64 grams of HI dissolved in 250 L of water. what is its [H+] 4. What is the pH of the solution in question #3? 5. A solution has 189 grams of HNO3 dissolved in 1000 L of water. What is pH?
February 25, 2014 by Emma

chemistry
In standardizing a potassium hydroxide solution, a student finds that 32.60mL of the base solution is needed to titrate 0.5045 grams of KHP to a phenolphthalein end point. In another titration, 26.63mL of this same base solution is needed to titrate 0.2003grams of an unknown ...
March 14, 2014 by Anonymous

chemistry
A 0.5215 gram sample of CaCO3 is dissolved in 12M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. How many moles of CaCO3 are used? What is the molarity of the Ca2+ in the 250 mL of solution? How many moles of Ca2+ ae in a 25.0 mL aliquot of the ...
April 28, 2009 by saddee

Organic chemistry
Assume that the partion compound is 3. Given 400mL of aqueous solution containg 12 g of compound. How many grams of A could be removed from the solution by a single extraction with 200mL of diethyl ether? Also how many total grams can be removed from the aqueous solution with ...
September 28, 2010 by ZP

general, organic and biochemistry
when a solution prepared by dissolving 4.00g of an unknown monoprotic acid in 1.00L of water is titrated with 0.600M NaOH, 38.7mL of the NaOH solution is needed to neutralize the acid. What was the molarity of the acid solution? what is the molecular weight of the unknown acid?
November 23, 2010 by Ksolo

Chemistry...Help please!!!
A solution of acetic acid is prepared in water by adding 11.1 g of sodium acetate to a volumetric flask and bringing the volume to 1.0 L with water. The final pH is measured to be 5.25. What are the concentrations of acetate and acetic acid in solution? (Assume that the ...
January 23, 2011 by medina

chemistry
The molar heat of solution of a substance is found to be +35.34 kJ/mol. The addition of 0.20 moles of this substance to 1.5 L water initially at 55. C results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to that of pure water. Find...
February 16, 2011 by kate

chemistry
A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 17.65 mL to reach a phenolphthalein end point. What is the molarity of...
April 4, 2013 by Ashley

Chemistry
A solution of the primary standard potassium hydrogen phthalate, KHC8H4O4, was prepared by dissolving 0.4877 g of potassium hydrogen phthalate in about 50 mL of water. Titration with a KOH solution required 24.71 mL to reach a phenolphthalein end point. What is the molarity of...
June 6, 2014 by Katie

Chemistry
Suppose you have 1 l of acid solution. With a pH of 2" , you add 1 l of pure water to it, wat happens to the pH of the solution? Explain! Is it correct if i state: the pH of the acid solution becomes neutral since pure water is neutral??
February 21, 2013 by Jessie

Chemistry
When determining the pH of a solution, will the indicator react with and change the properties of the solution. No, not significantly.
February 14, 2007 by KHNJ

chemistry
You need to make 350mls of a 70% ethanol solution of EtOH from a 95% solution. How would you do this?
January 23, 2008 by Kim

chemistry
A saturated aqueous solution of calcium hydroxide has a pH of 12.25. What is the [Ca2+] of such a solution?
March 18, 2008 by Anonymous

Algebra 1
quadratic equation. ax^2+bx+c=0 Solution 1,only solution. Can you help me I am struggling to work this out.
July 3, 2008 by Cynthia

Chemistry
Consider a .900 M Al(NO3)3 solution. This solution has a nitrate ion concentration of:
February 12, 2009 by Chris

Chemistry
Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
April 14, 2009 by Jessi

Chemistry
Describe how you would prepare 500 ml of a solution that is 40% bleach solution by volume.
April 14, 2009 by Jessi

chemistry
A solution of salt in water conducts electricity, but a solution of sugar does not Explain why
May 28, 2009 by john

algebra
What's the solution to 5n+1=5n-1. Please tell me if it's no solution or all real numbers or something else.
September 29, 2009 by Cristine

chemistry
8.00 of are dissolved in water to make 4.00 of solution. What is the concentration of hydronium ions, , in this solution?
November 2, 2009 by katy

chemistry
8.00 g of are dissolved in water to make 3.00 l of solution. What is the concentration of hydronium ions, , in this solution?
November 15, 2009 by leo

chemistry
What volume of a 2.90 M KI stock solution would you use to make 0.425 L of a 1.25 M KI solution?
January 14, 2010 by a

Algebra
Solve by the elimination method 2r-5s=1 5r+2s=46 The solution is _______, or there are infinitely many solutions, or there is no solution
March 21, 2010 by Liz

math
6x-4y=20 and 4y-6x=-20 What is the solution of the system of equations for this problem? A)A point B)No solution C)Infinitely many solutions
March 27, 2010 by KiKi

chemistry
a 1.00 L aqueous solution contained 5.80 g of NaOH. what is the pH of the solution? Can someone help me out with the setup of this?
April 28, 2010 by Anna

chemistry
How much water must be added if you want to make 1L of solution that is 6M, into a 3M solution
April 29, 2010 by sarah

Chemistry
Why is a NaOH solution disposed differently than a solution composed of Water and Nacl2
May 6, 2010 by Marge

chemistry
why does the pH of an aqueous solution change after HCl solution has been added
June 15, 2010 by meredith

math
Solve the following system of equations x + 4y=6 x= 4-4y A. The solution is an ordered pair ( , ) B. No Solution
July 9, 2010 by christy

chemistry
1 ml of diluted solution is added to 9 ml of deionized water. predist the ph of resulting solution
July 30, 2010 by Anonymous

Chemistry
A solution having a volume of 3.0L contains 23 mmol of Oxygen 2. What is the molarity of this solution?
October 3, 2010 by Elly

algebra
solve the systems of equations {4/7x+y=2/7 -1/8x-3/4y=-11/4 a. the solution of the system is b. there are infinitely many solutions c. there is no solution
October 17, 2010 by Anonymous

chemistry
What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?
November 4, 2010 by MaryBeth

chemistry
What volume of a 3.70 M KI stock solution would you use to make 0.400 L of a 1.25 M KI solution?
November 4, 2010 by MaryBeth

Pharm Tech
how many milliliters of a 5% stock solution are needed to prepare 250ml of a 2% solution?
November 4, 2010 by Kelsey

Chemistry
How much of a 6.0 M sucrose solution should be used to make 81.0 mL of a 0.055 M solution?
November 30, 2010 by Kelsey G

Chemistry
describe how you would make a 2.5L of a .100M KCL solution from a 5.5M stock solution
December 5, 2010 by lily

Chemistry
What is the molarity of the resulting solution when 300. mL of a 0.400 M solution is diluted to 800. mL?
December 6, 2010 by Ivy

chemistry
What volume of a 3.00 M KI stock solution would you use to make 0.270 L of a 1.25 M KI solution?
January 23, 2011 by Nikki

chemistry
An aqueos solution is 65%(v/v) rubbing alcohol.How many millimeters of water are in a 95-mL sample of this solution?
February 13, 2011 by Hector

chemistry
An aqueos solution is 65%(v/v) rubbing alcohol.How many millimeters of water are in a 95-mL sample of this solution?
February 13, 2011 by Hector

chemistry
find the pH of 10 mL of 1.00M solution after adding 10.00mL of indicator solution
February 14, 2011 by Anonymous

chemistry
What is the pH of a solution prepared by dissolving 7.5g HCl in water to make 375mL of solution?
February 27, 2011 by Brittany

chemistry
a certain solution contains 0.35 mol of HCl in 1200 mL of water. What is the pH of the solution?
March 7, 2011 by leah

chemistry
what is the molarity of solution made from the equivalent of 125 g of sodium nitrate in 1.0 l of solution
March 15, 2011 by andrew b

chemistry
To what volume should you dilute 20 mL of a 13 M stock solution to obtain a 0.560 M solution?
April 22, 2011 by Kristen

chemistry
how many ml of a 2M solution of HCl would be needed to neutrilize 2ml of a 5M solution of KOH?
April 26, 2011 by jackie3

Math.
1. 1/2(y-2)+2=3/8(3y-4) 2. Is 4 a solution? 3. Describe the process for finding out whether 4 is a solution to this equation.
May 6, 2011 by Unknown.

chem
density of 20% by mass C2H6O2 solution in water is 1.03 g/mL. find the molarity of the solution.
July 21, 2011 by lily

chemistry
What is the pH of a solution in which 296 mL of HCl measured at 28.0 C and 1.02 atm, is dissolved in 1.5 L of aqueous solution?
August 8, 2011 by Angel

chemistry
Q: A 1.5L solution is prepared using 75g of calcium chloride. What is the molarity of this solution?
December 5, 2011 by Anonymous

Chemistry
A solution contains 1.53x10-3 M Ca(NO3)2, How many nitrate ions are there in 1.2x10-6 L (1.2 L) of this solution?
January 23, 2012 by Cahleb

chemistry
what volume should the solution diluted to create a 2.0M solution with a 5g of potassium hydroxide?
April 24, 2012 by Shaunice

Chemistry
What is the concentration of a solution of lithium carbonate containing 0.01 mol in 750 mL of solution
June 13, 2012 by Nia Sharma

Science
What is the pH of 115 mL of a 1.50 m solution of HNO2 that is titrated with a 1.50 M solution of LiOH at the equivelence point?
June 20, 2012 by Jake

pre-calculus
solve the following inequality 16(x^2-1) >16x the solution set is? or there is no solution.
September 22, 2012 by ladybug

math
is it true that you only have to check your solution in a rational equation if the solution is 0?
September 27, 2012 by Matt

Chem help please
A solution is found to contain 1 x 10-4 OH− ions, determine the pH of this solution.
November 16, 2012 by Trevor

algebra
Does the system of equations have no solution, one solution, or infinitely many solutions? y = x + 4 y 4 = x
December 21, 2012 by Laura

algebra
Does the system of equations have no solution, one solution, or infinitely many solutions? y = 2x 3 y = x + 3
December 21, 2012 by Laura

chemistry
What is the molarity of an HCl solution if 38.5 mL of it is titrated to the equivalence point with 41.6 mL of a 1.41 M NaOH solution?
January 13, 2013 by Megan

math
tell wheter the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10
January 14, 2013 by Taylor

math
tell whether the system has one solution, infinitely many solutions, or no solution: y=3x-14 y-x=10
January 14, 2013 by Taylor

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