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October 20, 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: 57,303

chemistry
At 674.5 K the equilibrium concentrations of N2, H2, and NH3 were 0.1614 M, 0.1128 M, and 0.005892 M, respectively. What is the equilibrium constant for the reaction below? 2 NH3(g) → N2(g) + 3 H2(g)
May 6, 2014 by Andy

ap chem
Like all equilibrium constants, Kw varies somewhat with temperature. Given that Kw is 5.0210−13 at some temperature, compute the pH of a neutral aqueous solution at that temperature. 006
February 14, 2011 by Anonymous

chem
A solution initially contains 0.350 mol/L of A and 0.750 mol/L of B. A reaction occurs according to the equation 2 A(aq)+B(aq)<=> 3 C(aq)+D(s) At equilibrium, [C] is found to be 0.100 mol/L. What is the value of Keq?
January 26, 2012 by ami

physics
Which one of the following statements about an object performing Simple Harmonic Motion is TRUE? Select one: a. The object reaches its maximum speed as it passes through the equilibrium point. b. The objects velocity is never zero. c. The object has a constant velocity. d. ...
June 15, 2014 by jake

math
A linear system may have a unique solution, no solution, or infinitely many solutions. Indicate the type of the system for th following examples by U , N , or I , respectively. 1. 2x+3y=5 4x+6y=10 2. 2x+3y=5 2x+4y=6 3. 2x+3y=5 2x+3y=6
September 10, 2009 by Anonymous

Chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
May 5, 2010 by Jenifer

chemistry
explain how you would make the following solution. You should tell how many grams of the substance you need to make the solution, not how many moles. 2L of 6M HCl
May 5, 2010 by Jenny

Chemistry
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following equation represents the reaction: 2KMnO4+H202-> ...
September 18, 2010 by Peter

Physics
Two negative charges each of unit magnitude and a positive charge q are placed along a straight line. At what value of q will the system be in equilibrium? Check whether it is stable, unstable or neutral equilibrium.
February 16, 2013 by Daniel

AP CHEMISTRY
Calculate the solubility of LaF3 in grams per liter in the following solutions. (Ksp = 2. 10-19.) a) pure water Ans: .00182g/L b) 0.037 M KF solution c) 0.055 M LaCl3 solution NEED b&c PLEASE HELP
March 13, 2012 by HELP PLEASE

SCIENCE
IF YOU DROP DILUTE HYDROCHLORIC ACID ON THE MINERAL ARAGONITE(MINERAL), IT BUBBLES. WHAT MINERAL GROUP DO YOU THINK ARAGONITE(MINERAL) BELONGS TO AND WHY?
August 13, 2008 by SHARON

chemistry
Acid dissociation constant for HNO3+H2O-H3O+ +NO3= I have [H3O+][NO1-3]/[HNO3] Do I have this right?
November 22, 2011 by Sarah

Chemistry 11
the concentration of HCl, a strong acid is 0.500 M. if 20.0 ml HCl is needed to titrate 40.0 ml of NaOH, what is the concentration of NaOH Help me please. I'm confused by this
April 26, 2012 by Jessie

chemistry
Calculate the pH of a buffer using dihydrogen phosphate and it's conjugate base. The concentration of weak acid is 0.23 M and the conjugate base concentration is 1.19 M
April 3, 2013 by Anonymous

chemistry
A student generates H2(g) over water using the reaction between zinc and hydrochloric acid Zn(s)+ 2HCl(aq)---> ZnCl2(aq)+ H2(g) Data: Mass of vial and zinc 15.5082 mass of vial 15.3972 mass of zinc 0.111 final burette reading 45.30mL barometric pressure: Patm 100.6kPa ...
November 23, 2011 by Yuli

chemistry
If the equilibrium constant for the conversion of isobutane to n-butane is 2.5 what is the value of the equilibrium constant for the reverese reaction?
April 1, 2008 by Jennifer

Chemistry
The equilibrium constant, Kc is 3.2 x10 -34 at 25C for the reaction 2 HCl(g) <=> H2(g) + Cl2(g). what is The equilibrium expression, Kc for the reaction
April 27, 2011 by Donna

chemistry
When copper is dissolved in nitric acid, a brown gas (NO2) is evolved, either by direct production of NO2 or by production of NO which is oxidized to NO2 by O2. Provide a Lewis drawing and resonance structures for the nitrate anion.
October 4, 2008 by Vishnu

bio...
The main result of aerobic respiration is the 1 conversion of radiant energy into chemical energy 2 production of lactic acid as an end product 3 storage of energy in a polysaccharide 4 production of ATP from the breakdown of glucose
September 25, 2009 by Anonymous

Chemistry
Sodium carbonate reacts with hydrochloric acid as shown in an unbalanced chemical equation. What mass of Co2 is produced from the reaction of 2.94g Na2 Co2 with excess HCI? Na2CO3(s)+HCI(aq)+ CO2(g)+H2O A. 1.22 g B. 2.44 g C 2.94 g D 5.88 g E 7.08 g
July 21, 2011 by Taru

chemistry plz help!!!
are the following true for the element gallium? if they are false make them true. oxide more basic than Al203 oxide less basic than Mg(OH)2 hydroxide soluble in acid hydroxide soluble in base sulfide precipitates with H2S sulfide not soluble in (NH4)2S will form EaCl3, Ea2S3, ...
November 18, 2007 by Amanda

chemistry
are the following true for the element gallium? if they are false make them true. oxide more basic than Al203 oxide less basic than Mg(OH)2 hydroxide soluble in acid hydroxide soluble in base sulfide precipitates with H2S sulfide not soluble in (NH4)2S will form EaCl3, Ea2S3, ...
November 18, 2007 by Amanda

chemistry
what would the written chemical reaction be to this problem? How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium hydroxide? You'll need to write a chemical reaction, balance it, and then perform your calculation.
June 19, 2014 by anonymous

Physics 203
A block with mass of 5.0kg is suspended from an ideal spring having negligible mass and stretches the spring 0.20m to its equilibrium position. A) What is the force constant of the spring? B) The spring is then stretched 0.80m from its equilibrium position and then released ...
April 9, 2013 by ash

Chemistry
can someone check my answers thank you. 1)How many grams of hydrochloric acid are required to react completely with 4.30 grams of zinc? answer: 0.1328 g H2 2)How many molecules of gas will be produced? answer: 0.395x10^23 molecules
January 10, 2008 by Mike

Organic Chem
NaCl was used to rinse a condenser after distillation of 4-methylcyclohexene to remove unreacted phosphoric acid. Why is saturated NaCl used to rinse the glassware rather than water?
July 10, 2008 by Bert

Chem 3A
please help me with this chemistry problem. 1) Write out a balanced chemical reaction equation for the reaction of magnesium with hydrochloric acid, and then What is the Theoretical Yield after balancing the chemical equation?
July 25, 2008 by shylo

Chemistry- Equation
Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250 g H2SO4 completely reacted with aluminum?
March 5, 2010 by meg

Chemistry
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+ H2SO4(aq)---> BaSO4(s)+ H2O2(aq) How many milliliters of 3.00 M H2SO4(aq) are needed to react completly with 85.1g of BaO2(s)?
November 22, 2010 by Jason

chemistry
Oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9% sulfur trioxide. What is the percent by mass of sulfur trioxide (SO3) if oleum is expressed as 3H2SO4 . 5SO3?
April 8, 2011 by Diana

Chemistry
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2+H2SO4 -> BaSO4 +H2O2 How many milliliters of 3.50 M H2SO4(aq) are needed to react completely with 12.1 g of BaO2(s)?
October 3, 2012 by Anonymous

Chemistry
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2+H2SO4 -> BaSO4 +H2O2 How many milliliters of 3.50 M H2SO4(aq) are needed to react completely with 12.1 g of BaO2(s)?
October 3, 2012 by Anonymous

chemisty
Hydrogen peroxide can be prepared by the reaction of barium peroxide with sulfuric acid according to BaO2(s)+H2SO4(aq)=BaSO4(s)+H2O2(aq) How many milliliters of 5.00 M H2SO4(aq) are needed to react completely with 30.5 g of BaO2(s)?
February 28, 2013 by Bob

Net ATP please help!!!
Determine the net ATP production? from one molecule of acetyl CoA through the citric acid cycle and taking the products through oxidative phosphorylation?
April 17, 2013 by meg

understanding computers
could u tell me of several computer applications(familiar with) that wheather are primary effective or efficient. exp. doing homework by computer, company web sites,store scanner etc.-effective or efficient WhY? After browsing the 2 links at the bottom, try to find any aspect ...
July 8, 2006 by Haydee

CHEM.
1. a) What species are present in a 3.0 M NH3 solution? b) Qualitatively, what is the pH of this solution? c) What reaction(s) might occur when this solution is added to a solution containing Mn2+? d) What effect will adding HNO3 to the solution from part c have? Write any ...
April 6, 2014 by Anonymous.

Science-Chemistry
I did a lab on Elements and Compounds and I would be grateful if u could provide and tell me some information on my work. Lab --Investigation--Elements and compounds. Can an element be seperated from a compound? Can an element form a compound? In this investigation, you will ...
September 13, 2010 by Immy

Chemistry
Determine the boiling point elevation of H2O in the following solution a 2.5 m solution of C6H12O6 in H2O All i need is the formulas because i dont know how to solve it Thank you :l
March 7, 2010 by Veronica

chem
Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.
January 19, 2013 by Samantha

Aqueous Solution
Write the positive and negative ions that result when the following compounds are dissolved in aqueous solution: Na2S (aq): (NH4)2CO3 (aq): K2SO4 (aq):
March 17, 2013 by Annette W

aqueous solution
Write the positive and negative ions that result when the following compounds are dissolved in aqueous solution: Na2S (aq): (NH4)2CO3 (aq): K2SO4 (aq):
March 21, 2013 by Annette W

ap chemistry
The system CO2(g) + H2(g) *) H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to the system to bring the equilibrium CO ...
January 30, 2013 by cheri

AP Chemistry
The system CO2(g) + H2(g)<->H2O(g) + CO(g) is at equilibrium at some temperature. At equilibrium a 4.00 L vessel contains 1.00 mole CO2, 1.00 mole H2, 2.40 moles H2O, and 2.40 moles CO. How many moles of CO2 must be added to the system to bring the equilibrium CO ...
December 2, 2013 by Gabriella

anatomy
what evidence can i get that supports the idea that bones are living, active structure rather than dead objects. http://en.wikipedia.org/wiki/Bone when there scroll to bone cells question bones are living, active structures rather than dead objects.
November 10, 2006 by Haydee

science
which of the following pairs of terms could be used to describe a bullfrog that is active at night and enters a state of complete inactivity during cold months? A. cooperation and hibernation B. aggression and circadian rhythm C.circadian rhythm and hibernation D. courtship ...
December 9, 2013 by john

chemistry
benzoic acid: covalent magnesium chloride: ionic petrolatum: covalent potassium iodide: ionic sodium sulfate: ionic sucrose: covalent
January 16, 2008 by JayJay

chemistry
1(a) when 25.0ml of 0.500 mol.dm3 H2SO4(AQ) SOLUTION IS added to 0.025dm3 of 1.00 moldm3 KOH SOLUTION , THE TEMPERATURE OF THE REACTION MIXTURE RISES FROM 23.50 CELCIUS TO 30.17 CELCIUS . THE SPECIFIC HEAT CAPACITY AND DENSITY OF WATER 4.20j.g.celcius and 1.00 g.cm. the ...
February 9, 2012 by mustafe

Chem 1
Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...
April 9, 2013 by Jess

Chemistry
One step of the Ostwald process for manufacturing nitric acid involves making nitrogen monoxide by oxidizing ammonia in the presence of a platinum catalyst: 4NH3 (g) + 502 (g)>> 4NO (g) + 6H2O (g). If the percentage yield is 80.3%, how many grams of NO can be produced ...
June 10, 2013 by Shane

Chemistry
1.25 g of crushed limestone was added to 50.0 cm3 of 1.00 mol dm-3 hydrochloric acid (an excess). The mixture was left until all bubbling stopped and was then made up carefully to 250 cm3 with pure water. A 25.0 cm3 sample of this was pipetted into a conical flask and some ...
November 10, 2010 by Sophia

Chemistry
At 298 K, nitrous acid (HNO2) dissociates in water with a Ka of 0.00071. a)Calculate G for the dissociation of HNO2. (Use Ka to calculate the answer.) b) Calculate G if [H3O+] = 0.00070 M, [NO2 - ] = 0.16 M, and [HNO2 ] = 0.21 M.
September 29, 2011 by Heather

Business comunication
Which of the following is most likely to persuade the reader ? a.Describe your reader's solution first, explain why it won't work,and then go on to describe your own solution. b.Ignore your opponent's solution and just concentrate on your own. c.Describe your own solution ...
November 23, 2011 by ssmhollywood

Chemistry
Ok so you have 50mL of sucrose and 977mL of buffer solution - after equilibrium the concentration of sucrose is 0.48M - what is the concentration before hand? How do you do this??
April 11, 2010 by Sarah

Chemistry
At 25C, K = 0.090 for the following reaction:H2O(g) + Cl2O(g) 2 HOCl(g) Calculate the concentrations of all species at equilibrium for each of the following cases. (a) 1.2 g H2O and 1.6 g Cl2O are mixed in a 1.4 L flask. (b) 1.2 mol pure HOCl is placed in a 1.9 L flask
February 15, 2009 by Lindsey

Science
The Lactic Acid System a. supplies energy needed to walk or cycle continuously b. provides energy to pitch a baseball c. creates energy needed to pass another 5k participant with a burst on energy. d. none of these
April 2, 2009 by Betty

science
Potassium iodide is prepared by the reaction of hydroiodic acid and potassium hydrogen carbonate. water and carbon dioxide are also produced. in the reaction of 398 g HI and 318 g KHCO3, how many grams of KI are produced?
January 4, 2010 by A.

chemistry
if you have a reaction with an acid dissociation, where one HA goes to H + A how can the entropy be negative? I thought that one mole going to two moles would have positive entropy because of the greater disorder.
April 19, 2010 by carla

Chemistry
A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected of the water at .930 atm. and 23.0 degrees C. What is the percentage of sodium bicarbonate in the original mixture?
April 23, 2011 by Adele

Chemistry
2.8g of iron() reacted with 100ml of 2M sulfuric acid. A.Which reactant is in exces? B. What volume of hydrogen gas is produce at RTP? C. How many moles of iron sulfate is produced? D. How many atoms of hydrogen gas were evolved?
June 6, 2012 by Jeconiah

Chemistry
2.8g of iron() reacted with 100ml of 2M sulfuric acid. A.Which reactant is in exces? B. What volume of hydrogen gas is produce at RTP? C. How many moles of iron sulfate is produced? D. How many atoms of hydrogen gas were evolved?
June 6, 2012 by Jeconiah

Chemistry
a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitat weighs 2.99g what percentage of silver is the coin?
October 29, 2012 by Sarah

Chemistry
a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitate weighs 2.99g what percentage of silver is in the coin?
October 29, 2012 by HELP PLEASE!!!!

Science- chemistry
fuzzy silver coating is impure silver. it can be converted back into silver nitrate by reacting it with nitric acid what has been done to the reaction mixture to recover solid silver nitrate?
March 7, 2013 by Josh

college chemistry
I need to know how to calculate the value of the equilibrium constant for the reaction of zinc metal in a solution of silver nitrate at 25 degrees c. I am totally lost and do not even know if I have all the data I need. Help!
November 28, 2009 by angela

chemistry
Ethanethiol (CH3CH2SH, pKa=10.6) was named the smelliest substance in existence. Draw the equilibrium that forms when ethanethiol is added to a solution buffered at pH 9, and show the relative proportions of all organic species.
September 12, 2012 by Amy

chem
a. One can use pH differences to separate basic substances from non-basic ones. Which of the following would be suitable for use in the aqueous phase to achieve the separation of phenol from naphthalene: K2HPO4, K3PO4, (CH3)3NHCl, (CH3)3N, NaHCO3, Na2CO3? Explain your answer. ...
February 2, 2010 by lisa

Science help
Will someone please check my work for me? Molecules involved in a chemical reaction must meet to react. What is this concept called? entropy enthalpy collision theory<---- reaction rate 2. Which of the following equations is used to describe reaction rates? ∆H - T&#...
June 21, 2012 by Napolian 2

Chemistry
The conjugate acid in the reaction described in HCl(g) + NH3(aq) → NH4 +(aq) + Cl- (aq) is A. HCl(g). B. NH3(aq). C. NH4+ (aq). D. Cl-(aq). I think its B or C?
June 3, 2014 by Angela

physiology
Match each term with the appropriate description. A. peptide hormone B. steroid hormone C. amino acid-derived hormone D. anterior pituitary E. hypothalamus F. posterior pituitary lipophobic molecule that interacts with receptors on cell surface
November 7, 2012 by lilianna

chemistry
I need the equilibrium constant for the following reaction @ 25 deg. C 2CaCO3 (calcite) + Mg2+ <==> CaMg(CO3)2 (dolomite) + Ca2+
October 6, 2007 by Jeff

chemistry
Calculate Ke for the following (equilibrium concentrations given below substances) H2(g)+Br2(g) yields 2HBr(g) + heat[.513] [.62] [.346] Thank you!
January 18, 2010 by mary

chemistry
calculate Ke for the following (equilibrium concentrations given below substances) N2O4(g)+heat yields 2NO2(g) [.0325] [.022] Thank you!
January 18, 2010 by mary

chemistry
Which term in the following reaction would not be included in the equilibrium expression? 2 Na3PO4 (aq) + 3 MgCl2 (aq) → 2 Mg3(PO4)2 (s) + 6 NaCl (aq)
November 4, 2010 by barbra

chemistry
the following reaction is endothermic; 3O2(g) = 2O3(g) If this reation is at equilibrium will it shift to the right or left if we: 1) add some oxygen
March 30, 2011 by Chris

Chemistry- Please Help!!
Predict the proper equilibrium constant expression for the following reaction... Fe(OH)3(s) ----> Fe3+(aq) + 3 OH-(aq) Explain the reasoning behind your answer.
July 27, 2013 by Kelly

Chem
The equilibrium constant kc for the reaction N2(g)+ 3H(g)---2NH3(g) at 450C is 0.159. Calculate the equilibrium composition when 1.00 mol N2 is mixed with 3.00 mol H2 in a 2.00-L vessel. need help setting up the problem
April 14, 2010 by Anna

Chemistry
At 55C, the K for the reaction: 2NO2(g) <--> N2O4 is 1.15 a) write the equilibrium expression b) calculate the concentration of N2O4(g) present in equilibrium with 0.50 mole of NO2 Please help and explain
April 8, 2012 by Anonymous

Chemistry
1. I do not understand why this cannot go to equilibrium? Na2CO3(aq)+HCl(aq)->H2O(l)+CO2(g)+NaCl(aq) Please explain. 2. Are K subscript c the same as K subscript eq? Do they both stand for the equilibrium constant?
December 2, 2013 by Anonymous

chemistry
Equilibrium constant K for some reaction at temperature 300K was found to be 100 .Calculate equilibrium for same reaction at 400K if R= 8.23 change in enthalpy is 5000J
August 18, 2014 by shashank

chemistry
Use the following balanced equation. 3Sr(OH)2 + 2H3PO4 --> 6H20 + Sr3(PO4)2 20 mL of H3PO4 is required to react with 40 mL of a 0.15 M Sr(OH)2 solution. What is the molarity of the H3PO4 solution?
June 20, 2011 by Brea

chemistry
Make a buffer solution with the following specification pH=5.5 Volume=2L total concentration=1M ... a) Name the components?... b) How many grams of each component would you use to make 2L of solution
July 25, 2011 by Anonymous

chemistry
Make a buffer solution with the following specification pH=5.5 Volume=2L total concentration=1M ... a) Name the components?... b) How many grams of each component would you use to make 2L of solution
July 25, 2011 by Anonymous

Chemistry
Consider a 0.71 M solution of each of the following salt dissolved in distilled water. Will the solution by basic, neutral, or acidic? KI= NH4NO2= (CH3CH2)3NHNO2= (CH3CH2)2NH2ClO4=
December 11, 2012 by Chris

Chemistry
For the reaction NO2(g) + NO(g) = N2O3(g) If at particular temperature, K was 575 and equilibrium concentration of N2O3(g) was 2.5 M, calculate the equilibrium concentrations of NO2(g) and NO(g) if they both had the same initial concentrations. i have my table layed out like...
September 25, 2011 by Sara

chemistry
The equilibrium constant Kc for the reaction C <--> D + E is 7.90 * 10^-5. The initial composition of the reaction mixture is [C]=[D]=[E]=1.10*10^-3. What is the equilibrium concentrations of C, D, and E? C=? D=? E=?
November 4, 2012 by Brunette

organic chem
a. One can use pH differences to separate basic substances from non-basic ones. Which of the following would be suitable for use in the aqueous phase to achieve the separation of phenol from naphthalene: K2HPO4, K3PO4, (CH3)3NHCl, (CH3)3N, NaHCO3, Na2CO3? Explain your answer. ...
February 2, 2010 by lisa

math
A reciepe for tomato and pasta salad calls for 32 ounces of tomatoes and 4 cups of pasta.the recipe makes 8 Servings.If you only wnat to make enough for 2 servings, how much of each ingredient should you use/
September 1, 2011 by n

AP Chemistry
At 350 K, Kc= 0.142 for the reaction 2BrCl(g)<-> Br2(g) + Cl2(g) An equilibrium mixture at this temperature contains equal concentrations of bromine and chlorine, 0.049 mol/L. What is the equilibrium concentration of BrCl? Answer in units of M
November 27, 2013 by Gabriella

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

biology
Comparisons of amino acid sequences from different organisms often shed light on the evolutionary divergence of related species. Would you expect all of the proteins of a given set of living species to show the same degree of divergence?
April 18, 2010 by B

Chemistry
If you have 20.0g of a Maalox tablet, and 40mL of .1 M HCI, how much extra help from NaOH would you need to bring the acid to neutral? Back titrate using .05 mL NaOH, drop by drop. Please put this into a formula for me to figure out. Thanks.
March 26, 2013 by Pam

home economics
Graphing : Mooville is a small town in texas. assume that beef is a normal good. what happens to the amount of beef dfemanded or supplied in each of the following cases? draw a separate demand and supply curve for each part of this question, label the axes, and show how the ...
March 2, 2008 by Miriam

Chemistry
Calculate the theoretical pH after 2.50ml and 9.50ml of NaOH has been added in both the titration of HCl and of HC2H3O2.
May 10, 2011 by anna

chemistry
You are given a bottle of household vinegar of volume 500 cubic centimeters. Design an experiment to determine its concentration. Add illustrations
March 12, 2011 by lee

chemistry
Determine the molarity of in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of in air is 20.65 Under an pressure of 1.00 , 28.31 of dissolves in 1.00 at 25.
February 21, 2010 by sab

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

history
Each of the following was an aspect of the Old Age, which greatly appealed to conservatives in the early 1800s, Except: A. the desire for royal families to be restored to the thrones they occupied when Napoleon swept across Europe. B. the support of an established church. C. ...
August 5, 2009 by Warda

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

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