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September 21, 2014

Search: Acetic acid is the active ingredient in vinegar. In a solution of acetic acid the following equilibrium is established: HC2H3O2

Number of results: 56,493

Chemistry Equilibrium
At 500 C, the decomposition of water into hydrogen and oxygen, 2H2O(g) 2H2(g) + O2(g) has Kc = 6.0 10-28. What are the concentrations of H2 and O2 that are present at equilibrium in a 2.00 L reaction vessel at this temperature if the container originally held 0.086 mol H2O?
April 10, 2014 by Anonymous

chemistry
"experiment: spectrophotometric determination of the acid dissociation constant of methyl red" 1. Why are matched cells used in the experiment? 2. Why is pH plotted against log([MR-]/[HMR])? 3. Why is it right that HMR has a pH equal to 2 and MR- to have a pH equal to 8?
September 20, 2007 by smiley

Organic Chemistry
What would be the acid base reaction of: c2h30- and phenol(benzenol) C6H5OH be? Ok so this would result in the production of water, and the double bonds in phenol would open up and react, but I don't know what the end product would be??
February 11, 2010 by Natasha

chemistry
Here's the problem: You need to make 300L of 2.25M perchloric acid. It costs $25.95 for a 4.00 liter bottle of 60% HClO4, and $34.95 for a 4.00 liter bottle of 70% HClO4. Should you buy the 60% or the 70% bottles? Show your calculations and explain.
May 5, 2011 by Evie

chemistry
Zinc metal reacts with hydrochloric acid to produce hydrogen gas according to the equation below. What volume of hydrogen at STP is released when 15.1 grams of zinc react at STP? Zn(s) + 2HCl(aq) ZnCl2(aq) + H2(g)
June 9, 2011 by katydid

chemistry help plz
benzene ring-N-H-CH3 H \ N-benzene ring / CH3 select the class of compound from the choice below. 1-acetal 2-alcohol 3-alkene 4-amide 5-amine 6-carboxylic acid 7-ester 8-haloalkane
January 20, 2013 by centya

Chemistry
Calculate the mass of baking soda, NaHCO3, needed to neutralize 3.0 mL of 3.0 M hydrochloric acid, HCl(aq). Ok, so I'm super confused. I have the equation, but I'm stuck with what to do with it. Equation: NaHCO3 + HCL --> NaCl + H2O + CO2
February 27, 2013 by Sarah

Chemistry for health science
Considering the neutralization reaction when nitric acid reacts with solid iron(II)carbonate. What is the minimum volume of 2.00 M HNO3 necessary to react completely with 1.06 kg of solid iron(II) carbonate, FeCO3 ?
March 23, 2014 by Anonymous

chemistry
using your initial mass of copper, calculate the minimum volume of concentrated 12M nitric acid needed to completely react with your copper to form copper(II) nitrate? Original mass of copper was 0.40g.
September 18, 2014 by anon

physics
A horizontal spring attached to a wall has a force constant of 800 N/m. A block of mass 1.10 kg is attached to the spring and oscillates freely on a horizontal, frictionless surface as in the figure below. The initial goal of this problem is to find the velocity at the ...
September 27, 2011 by Anonymous

chemistry(Acid&Base)
Calculate the solubility product of calcium hydroxide if the solubility of Ca(OH)2(s) in water at 25◦C is 0.011 M. Choices: 1. 1.1 10−5 2. 5.3 10−6 3. 2.7 10−6 4. 1.5 10−8 5. 1.2 10−4
May 12, 2011 by vivian

Chemistry practice
Glycine is the amino acid used to make proteins a)for each mole of glycine that burns,973.49k/mol of which is libarated eqution and the values of delta Hf^o for the products of combustion to calculate the enthalpy of formation for glycine.Represent your working on the energy ...
August 5, 2011 by Gift

Chemistry
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide,H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction: 2KMnO4(aq)+...
October 3, 2010 by Ellen

Chemistry
Without detailed equilibrium calculations, estimate the equilibrium concentration of SO3 when a mixture of 0.134 mol of SO2 and 0.067 mol of O2 in a 275 mL flask at 300oC combine to form SO3. 2 SO2(g) + O2(g) = 2 SO3(g) Kc = 6.3x10^9 I tried doing an ICE chart, and also tried ...
February 14, 2012 by Kiba

Math/Algebra
Solve the following system of equations. x+7y=8 (1) x=2-7y (2) What is the solution of the system? Type the ordered pair state that there is no solution. I don't understand what they are asking me to do. Should I use #2 in equation #1 or something else?
May 9, 2010 by Maverick

Chemistry
Calculate the solubility of LaF3 in grams per liter in the following solutions. The Ksp of LaF3 is 2.01 e-19. (a) pure water (b) 0.051 M KF solution (c) 0.065 M LaCl3 solution
October 1, 2010 by Tiffany

Alg 1
Completing the square: Which of the following is a solution x^2 + 14x + 112 = 0? If necessary round to the nearest hundredth. x= -0.24 x= -4.24 x= 4.24 no solution I worked it and got neither of the answers. I got x= 0.9 and x=-14.9. Where did I go wrong? Thanks
April 14, 2013 by Jane

Chemistry
Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
April 16, 2013 by Jamie

Chemistry
Consider the following reaction that describes the solubility equilibria of solid Zn(OH)2 in aqueous solution (Ksp of Zn(OH)2 4.0x10^-17. Calculate molar solubility of Zn(OH)s in an acidic solution of pH5.0.
April 16, 2013 by Jamie

ALGEBRA
A chemist is asked to make 10 liters of a a35% solution. She has only a 10% solution and a 50% solution to work with. how much of each solution must she mix to ge 10 liters of the 35% solution?
January 28, 2012 by jackie

Chemistry
What happens to the hydroxide ion concentration in aqueous solutions when we increase the hydrogen ion concentration by adding an acid? Would it be good enough to answer by stating that the OH- ion concentration decreases, lowering the pH?
October 18, 2011 by Kevin

physic
For a class demonstration, your physics instructor pours 1.16 kg of steam at 100.0C over 4.69 kg of ice at 0.0C and allows the system to reach equilibrium. He is then going to measure the temperature of the system. While the system reaches equilibrium, you are given the ...
April 11, 2011 by help me please

Art
Name 5 functions of art. Do you think certain art should be censored? If so under what circumstances, and should the government sponsor or pay for these controversial artworks? 1) http://arthistory.about.com/cs/foreducators/f/functions.htm 2, 3,) http://www.google.com/search?...
July 9, 2006 by Joe

Chemistry
List the amino acid side chains that can accept H+ and those that can donate H+ during enzyme catalyzed reactions. I have lysine, arginine, and histidine as acceptors and serine, threonine, and tyrosine as donators. Could someone just tell me if those are correct and if I am ...
April 20, 2010 by Holly

Biochemistry
My professor was saying something about cycling, how it compacts the structure, and how it relates to solubility somehow. He used the example of cyclohexane vs. hexane, but I didn't catch what he said. And then he mentioned proline, which is a cyclic amino acid. Did he mean ...
September 26, 2010 by John

Chemistry
Weak polyprotic acids are normally added to Coca Cola to lower its pH to about 2.5 and impart tartness? Show that a two litter cocacola bottled drink that contains 0.057 to 0.084 percent of 75 percent of phosphoric acid by mass,meets this ph requirement. Pka1= 2.12
November 29, 2013 by Daniel

Chemistry
Weak polyprotic acids are normally added to Coca Cola to lower its pH to about 2.5 and impart tartness? Show that a two litter cocacola bottled drink that contains 0.057 to 0.084 percent of 75 percent of phosphoric acid by mass,meets this ph requirement. Pka1= 2.12
November 29, 2013 by Daniel

Physics
A spring with k = 54 N/cm is initially stretched 1 cm from its equilibrium length. (a) How much more energy is needed to further stretch the spring to 2 cm beyond its equilibrium length? (b) From this new position, how much energy is needed to compress the spring to 2 cm ...
June 2, 2012 by Kelly

AP Chemistry
The equilibrium constant for the reaction PCl3(g) + Cl2(g)<-> PCl5(g) is 35000 at 760◦C. At equilibrium, the partial pressure of PCl5 was 110 bar and that of PCl3 was 9.98 bar. Calculate the equilibrium partial pressure of Cl2. Answer in units of bar
November 27, 2013 by Gabriella

calculus maths
Hi can some one help, explain the following please. I seem to have issues with this: 1- Find the corresponding particular solution (in implicit form) that satisfies the initial; condition y = when x = 0. 2- Find the explicit form of this particular solution. 3- What is the ...
February 15, 2011 by Claire

Chemistry
An aqueous KNO3 solution is made using 72.5 grams of KNO3 diluted to a total solution volume of 2.00 liters. If the molarity of the solution is .359 M and the molality of the solution is .354, what is the mass percent of the solution?
February 19, 2012 by Adam

Chem
At 850 C, the equilibrium constant Kp for the reaction: C(s)+CO2(g) >< 2CO(g) has a value of 10.7. If the total pressure in the system at equilibrium is 1.000 atm, what is the partial pressure of carbon monoxide.
April 22, 2009 by Noemi

chem
Reaction H2 +I2 yields 2HI All three gases are initially at 0.1atm/ upon reaching equilibrium it is found that H2 pressure droped by 55% what is the equilibrium constant for this reaction.
December 26, 2010 by Anonymous

College Chemistry
The equilibrium constant Kc for the reaction N2(g) + 3H2(g) -> <- 2NH3 at 450 degrees celcius is 0.159. Calculate the equilibrium compostion when 1.00 mol N2 is mixed with 3.00 mol H2 in a 5.00-L vessel.
March 7, 2011 by Anonymous

economics
Select a product and for that the government places a mandated price ABOVE the equilibrium price, based on your research how would this affect the market equilibrium, explain your view.
January 17, 2013 by judy

CJS230
Will someone please help me find a website to read to answer the following questions? What were womens prisons like before the 1800s? How have they changed? What are the three basic arguments established in the 1800s that supported the separation of juvenile prisoners from ...
June 5, 2012 by Sade C

Chemistry
My question is ..can anyone explain how to do problem #2? I feel lost. :( And could you also explain why? Problem#1, is that a regular dG = dH - TdS problem? Then using Go = -RTlnK to find K? Im just afraid if there are other seps to it.. 1. The combustion of butane has the ...
April 6, 2014 by Lynn

Chem for final, please help!
How many moles of H+(aq) ions are present in 1.25 L of 0.75M Nitric Acid? A. 0.60 mol B. 0.75 mol C. 0.94 mol D. 1.7 mol E. 1.9 mol Please show me how to work this!
December 7, 2010 by lavonne

math
A recipe for a fruit shake calls for 5 parts milk, 3 parts banana puree, and 2 parts strawberry juice. Find the quantity of each ingredient necessary to make an 8 ounce shake.
December 5, 2013 by Katie

Chemistry
Phenolphthalein is an indicator that changes colour to pink/purple between pH 8-->10, however, neutralization occurs when pH=7. Why can phenolphthalein still be used as the indicator during a strong acid-strong base titration with virtually no error?
December 12, 2007 by Lucy

Chemistry
What type of reaction may be occurring when a person's skin develops a green stain beneath a 14 K gold bracelet? Using HA as the chemical formula for acid in skin, write a balanced chemical equation to represent the reaction.
March 7, 2009 by Lucy

College - Chemistry
Given that delta Hrxn for OH- ions is -22.9 kJ/mol, calculate the enthalpy of neutralization when I mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25-degrees C.
October 22, 2010 by Mint

chemistry
copper metal reacts with nitric acid. assume that the reaction is 3Cu(s) + 8HNO3(aq) > 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l). if 5.58 grams of Cu(NO3)2 is obtained, how many grams of nitrogen monoxide would have formed
October 12, 2012 by robert

CHEMISTRY
CaCO3(s)+2HCl(aq)>CaCl2(aq)+H2O(l)+CO2(g) how many grams of calcium chloride will be produced when 30 g of calcium carbonate are combined with 13 g of hydrochloric acid? Which reactant is in excess and how many grams of this reactant will remain after the reaction is complete?
March 20, 2014 by YOLANDA

Chemistry
Hello! I am having a little difficulty answering these two questions on my homework, I was wondering if anyone could please help me out! Thank you! 1) Consider the following balanced chemical equation for the neutralization reaction of calcium hydroxide with hydrochloric acid ...
November 30, 2013 by T.C.

Chemistry-help needed
Concentrated sulphuric acid and manganese(IV) oxide were added to the solid. On warming a gas was evolved which turned litmus colourless. The answer is that Cl2 gas was evolved and chloride ion is present. Can you please explain the reaction that took place?
February 2, 2009 by Janice

Chemistry
Deduce the anion present in the salt. Assume that the reagent is added to simple salt: - Test: - Concentrated sulphuric acid and manganese(IV) oxide were added to the solid. On warming, a gas was evolved. It turned litmus colourless. Is there something wrong with the question?
February 2, 2009 by janice

Chemistry
Write an equation for the reaction between the Bronsted-Lowry acid HOCl(aq) reacting with base CO32-(aq) I am having difficulty with this question. Here is what i have so far but I know i went wrong somewhere. HOCl (aq) + CO32-(aq) --> HCO3-(aq) + OCl(aq) Any help would be ...
March 2, 2010 by Matthew

chemistry
How can I group white substances into 2 groups according to their properties&list the properties of each group? Calcium carbonate, citric acid, sucrose, Phenyl salicylate, Potassium iodide,and Sodium chloride Also, which of them dissolves in water and which has solubility in ...
February 2, 2012 by Jessica

chemistry
How can I group white substances into 2 groups according to their properties&list the properties of each group? Calcium carbonate, citric acid, sucrose, Phenyl salicylate, Potassium iodide,and Sodium chloride Also, which of them dissolves in water and which has solubility in ...
February 2, 2012 by Jessica

CHEMISTRY
Dye of iodine is prepared by dissolving in ethanol , and 1% ( one percent ) of this solution contains 10 g of solute in 1000 g of solution 1) how many grams of solvent is there in the solution ? 2) how many moles of solute ( I2) is there? 3) what is the molality of 1% of this ...
July 12, 2014 by MAD

chemistry
The correct interpretation of the equation below is:? Fe3+(aq) + SCNC(aq) FeSCN2+(aq) A. The reaction is incomplete because the product is still charged. B. A heterogeneous equilibrium exists because of the charged ions. C. The equilibrium constant is Kc = [Fe3+][SCNC][...
April 10, 2008 by david

statistics
It appears to people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, minutes of activity varied according to the N(373,67) distribution. Minutes...
September 12, 2011 by Darcy

Chemistry
Nitrate salts containing metal ions with the following electron configurations are added to water to make a solution. Predict whether the salt solution will be colored or colorless and explain the reasoning. a. [Kr]4d10 b. [Ar]3d3
November 19, 2013 by Anonymous

The Curriculum
Which of the following is not part of negotiating a conflict? A. Enforcing your preferred solution B. Explaining the reasons behind a suggested solution C. Accepting reasonable disagreement D. Listening to and acknowledging others' rights, opinions, and feelings my answer is d.
September 13, 2014 by Daniela

Physical Chemistry
A total charge of 97.4 kC passes through an electrolytic cell. Determine the quantity of substance produced in each of the following cases. (a) the mass (in grams) of silver metal from a silver nitrate solution ?g (b) the volume (in liters at 273 K and 1.00 atm) of chlorine ...
March 29, 2010 by Mark

College General Chemistry
How would you prepare each of the following solutions? a. 100mL of a 155ppm solution of urea, CH4N2O, in water. b.100mL of an aquaneous solution whose K+ concentration is 0.075M
January 31, 2011 by DONDON

chemistry
A salt solution can be acidic, basic, or neutral. when dissolved in water, which of the following salts will make the solution basic: KCl, FeCl3, NaNO3, CaCO3, LiF, and NH4Br?
April 17, 2011 by max

algebra
Solve the following rational inequality. Write the solution in interval notation. Show the number line and breaking points or graph of the polynomial with the part of the graph that is the solution (x-4)(x+2)/(x-3)(x+5) 0
March 28, 2014 by james

algebra
Solve the following rational inequality. Write the solution in interval notation. Show the number line and breaking points or graph of the polynomial with the part of the graph that is the solution (x-4)(x+2)/(x-3)(x+5) 0
March 29, 2014 by james

chemistry
Liquid Nitrogen tetroxide, N2O4(l), was used as a fuel in Apollo missions to the moon. In a closed container the gas N2O4(g) decomposes to nitrogen dioxide, NO2(g). The equilibrium constant,k, for this reaction is 0.87 at 55 degrees Celsius. A vessel filled with N2O4(g) at ...
April 3, 2008 by Claus

Science
The Keq for the equilibrium below is 5.4 1013 at 480.0 C. 2NO (g) + O2 (g) ↔ 2NO2 (g) What is the value of Keq at this temperature for the following reaction? NO2 (g) ↔ NO (g) + 1/2 O2 (g) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. 2NO (g) + O2...
March 19, 2013 by DrewS

Chemistry
The Keq for the equilibrium below is 5.4 1013 at 480.0 C. 2NO (g) + O2 (g) ↔ 2NO2 (g) What is the value of Keq at this temperature for the following reaction? NO2 (g) ↔ NO (g) + 1/2 O2 (g) The Keq for the equilibrium below is 5.4 1013 at 480.0 C. 2NO (g) + O2...
March 19, 2013 by DrewS

Chemistry
K=1.6x10^-5 mol/L for the following reaction 2NOCl(g).... 2 NO(g) + Cl2(g) Calculate the concentrations of all species at equilibrium for each of the following original mixtures E) 2.4 mol of NOCl, 2.4 mol of NO, and 1.2 mol Cl2 in a 1.0 L flask F)1.9 mol/L concentration of ...
November 20, 2007 by AMANDA

chemistry
which of the following would be expected to have the lowest freezing temperature? a. Ca(NO3)2 b. NaC2H3O2 c. CuSO4 d. HC2H3O2 e. C2H5OH per what? per gram? per mol? Any could have the lowest freezing point if I put a cup of any one and a scant amount of the others. For equal ...
April 21, 2007 by mary

Chemistry
I had to perform an experiment for rate of reaction. The point of the experiment was to show how changes in reactant concentration, temperature, and catalyst presence can affect the rate of a reaction. The reaction that we studied was H2O2 + 2I^- + 2H^+ -> I2 + 2H2O We had ...
February 25, 2012 by Hannah

Chemistry
Write the equilibrium constant expression, K, for each of the following reactions. Where appropriate, designate the K as Ksp. 2H2(g) + O2(g)<-->2H2O(g) 2Hg(l) + Cl2(g) <-->Hg2Cl2(s)
November 14, 2011 by Kevin

Chemistry
Consider the following equilibrium at 395K: NH4HS(s) <--> NH3(g) + H2S(g) The partial pressure of each gas is 0.265 atm. Calculate Kc for the reaction
January 4, 2013 by Cami

Chemistry
Consider the following equilibrium at 395K: NH4HS(s)<-> NH3(g) + H2S(g) The partial pressure of each gas is 0.265 atm. Calculate Kc for the reaction.
February 19, 2013 by Susan

MATH
Which of the following equations has the given solution set? Solution set: A)-2m + 5 = 2m + 5 B)-2m + 5 = -2m + 5 C)-2m + 5 = -2m - 5 D)none
March 5, 2010 by nicky

Chemistry
Determine the pH of each of the following solution. a solution that is 5.810^−2 M in HClO4 and 2.610^−2 M in HCl
March 21, 2010 by Kyle

Chemistry
2H2 (g) + O2 (g) <---> 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3<K<10^3 c)k=0 d)k>10^3 i know that choice c is incorrect because if k=o there would be no need to calculate equilibrium, but how would i go about ...
March 11, 2010 by Katie

Chemsitry
At 25 C, only 1.9 g CaSO4 (MM = 136 g/mol) will dissolve in 2.00 L of water. Write the equilibrium expression and calculate the equilibrium constant for the reaction below. CaSO4 (s) ⇋ Ca2+ (aq) + SO42- (aq)
June 13, 2010 by Michelle

Chemistry
when Fe(NO3)3 and KNCS were mixed they reacted together to establish an equilibrium with FE(NCS)+2. what are the changes in terms of quotient Q when the solutions were just mixed (no reaction), to the point where equilibrium is reached.
October 31, 2010 by LP

Chemistry
At 1473K the equilibrium constant for the reaction H2(g) + Cl2(g) <--------> 2HCl(g) Kc = 2.5*10^4. What would be the equilibrium concentration of HCL if the initial concentrations of H2 and Cl2 were 0.1840M and 0.1918M. I got 29.7 but was told it was wrong
March 12, 2011 by Jude

chemistry calculations
At 25 deg C, Kc is 5.84x10-3 for the dissociation of dinitrogen tetraoxide to nitrogen dioxide. N2O4(g) ==== 2NO2(g) a) Calculate the equilibrium concentration of both gases when 4.00 grams of N2O4 is placed at 2.00-liter flask at 25 deg C. b) What will be the new equilibrium ...
August 30, 2014 by =)

Chem Class
The equilibrium constant for reaction 1 is K.....? how do i figure out problems like this? do i check which ones cancel out? The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ___? (1) SO2 (g) + (1/2) O2 (g) (right and left arrows)SO3 (g...
October 25, 2010 by Awr

Chemistry
Sally Scientist is trying to determine Avogadro's number using a procedure analogous to that in Experiment 4. She fills a watchglass with diameter 11.9 cm with water and is trying to create a monolayer of stearic acid on the top of the water. What is the area of the water ...
February 7, 2010 by Mindy

chemistry
Consider the formation of cyanogen c2n2 and its subsequent decomposition in water given by the equations 2Cu2+ + 6CN- 2[Cu(CN)2]- + C2N2 C2N2 + H2O HCN + HOCN How much hydrocyanic acid HCN can be produced from 35.00 g of KCN, assuming 100% yield?
October 19, 2012 by Arik

chemistry
Record measured absorbance for each tube in following table. Complete the table by calculating the [ Fe(SCN2+)]eq and [Fe3+]initial and [HSCN]initial Data: Volume of 2.00 x 10-3 M Fe(NO3)3 solution, mL 1)5.00, 2) 5.00, 3) 5.00 4) 5.00 5) 5.00 Volume of 2.00 x 10-3 M HSCN ...
September 27, 2012 by Brittany S

chemistry
Record measured absorbance for each tube in following table. Complete the table by calculating the [ Fe(SCN2+)]eq and [Fe3+]initial and [HSCN]initial Data: Volume of 2.00 x 10-3 M Fe(NO3)3 solution, mL 1)5.00, 2) 5.00, 3) 5.00 4) 5.00 5) 5.00 Volume of 2.00 x 10-3 M HSCN ...
September 27, 2012 by Brittany S

chemistry
how can the purity of water be established?
April 30, 2009 by michael

economics
why was the federal reserve established ?
February 15, 2011 by angelica

Biology!!
Darwin is considered the "father of evolutionary biology." Four of his contributions to the field of evolutionary biology are listed below. The nonconstancy of species. Branching evolution, which impleies the common descent of all species. occurrence of gradual changes in ...
January 16, 2011 by Mary

equilibrium constant (Kp)
What is the equilibrium constant "Kp" at 200 C for the reaction below: P4(s) + 6 Cl2(g) --><-- 4 PCL3(l) Given the following at 200 C P4(s)+ 10 Cl2(g) --><-- 4 PCl5(s) Kc=8.12 PCl3(l)+ Cl2(g) --><-- PCl5(s) Kc=0.771 Answer: 6.7*[10^(-9)] not sure what to do. ...
July 20, 2011 by k

chemistry
Take a cup of water, add sugar, and stir. If the resulting solution contains sugar crystals that do not dissolve, the solution is said to be? a)an unsaturated solution b)a saturated solution c)a homogeneous solution d)none of the above Is it d - supersaturated
July 23, 2010 by Thelma

Economics (Cournot Equilibrium)
If market demand is P = 100 - Q and MC is 40, what is the Cournot Equilibrium for N firms?
September 20, 2008 by Bob

chem ap
please tell me if i am correct a buffer is made using HF and NaF-with a pH of 3.00. compute the ratio of the conjugate base F- to weak acid HF. I previously found Ka of HF which is 7.2x10^-4 and the ph of HF is 3.15. the concentration of NaF would be 1.00x10^-2 ???? and so the...
April 17, 2008 by quentin

chemistry check my work
C7H6O3+CH3OH→C8H8O3+H2O In any experiment, 1.50g of salicyclic acid is reacted with 11.20g of methanol. The yield of methyl salicylate, C8H8O3, is 1.31g. What is the percent yield? percent is 77.l1% is this correct?
April 15, 2010 by Molly

Chemistry
In the first step of the Ostwald process for the synthesis of nitric acid, ammonia is converted to nitric oxide by the high-temperature reaction:4NH3(g)+5O2(g)+6H2O(g). How is the rate of consumption of O2 related to the rate of consumption of NH3?
June 20, 2010 by Deborah

College Chemistry
Given that delta Hrxn for OH- ions is -229.6 kJ/mol, calculate the enthalpy of neutralization when I mole of a strong monoprotic acid (such as HCl) is titrated by 1 mole of a strong base (such as KOH) at 25-degrees C.
October 26, 2010 by Alexis

Chemistry II
A storage tank containing 1.6x10^4 Liters of water is found to be contaminated with nitric acid and therefore has a pH of 3.78. Calculate the volume of 0.050 M sodium hydroxide required to be added to the tank in order to neutralize (pH = 7.0) the contaminated water.
October 3, 2011 by Wendell

chemistry homework help!!
CaCo3(s)+2HCl(aq)---->CaCl2(aq)+H2O(l)+CO2 How many grams of calcium chloride will be produced when 27.0g of calcium carbonate are combined with 14.0g of hydrochloric acid? Which reactant is in excess and how many grams of this reactant will remain after the reaction is ...
February 15, 2012 by danielle

Math
1.64g of a mixture of cac03 and mgc03 was dissolved in 50ml of 0.8M hcl. The excess of acid required 16ml of 0.25M naoh for neutralization. Calculate the percentage of cac03 and mgc03 in the sample Steve helps me step by step
December 25, 2013 by Fai

chemistry
Consider the equilibrium, A + B <--> C, with K=32.217 and initial concentrations of A,B, and C, of 3.665M, 0.883M, and 3.925M, respectively. What is the equilibrium concentration of B 3.665 0.883 3.925 A + B = C Keq=(C)/(A)*(B)= 32.217 Q = (3.025)/(3.665)*(0.883)=1.21 Q...
February 7, 2007 by Rob

Chemistry 12
name a compound that acts as a weak base? methanol? define the term weak bronsted-lowry base im not sure how to put this in words, but a weak base is found when you got a strong acid, when your ka is high, kb will be low.
January 25, 2013 by Shreya

Chemistry
The equilibrium constant Kc^i is 3.2x10^-34 at 25 degrees C for 2HCl(g) -> H2(g) + Cl2 (g). The equilibrium constant Kc^ii is .10 at 25 degrees C for 2ICl (g) -> Cl2 (g) + I2 (g). a) Calculate the equilibrium constant Kc for the reaction below at 25 C Cl2(g) + I2 (g) -&...
March 13, 2014 by Lily

Chemistry
A reaction is said to be diffusion controlled when it occurs as fast as the reactants diffuse through the solution. The following is an example of a diffusion controlled reaction. The rate constant for this reaction is 1.4x1011 M-1s-1 at 25oC and the reaction obeys the ...
May 19, 2009 by Kevin

Chemistry
Draw the structure of the product formed by the reaction between methyl alcohol and formic acid and give the molecular formula HCOOH + HOCH3 ==> HCOOCH3 + H2O determine this molar concentration 58g of lithium in 54-ml of water molarity = mols/L mols Li = 58/atomic mass Li...
April 12, 2007 by Kellie

Asia - JAPAN- Pollution
Hi, I have got a question about Japan's geography; In which ways has the actions of man ( people) affected Japans land? I mean like acd rain, carbon dioxide etc.( negative effects on the country) I've been googling it, but I cant find anything. Bea
May 24, 2010 by Beatrice

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