November 30, 2015

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

Number of results: 65,352

How many milliliters of 0.602M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.538M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.
March 28, 2013 by Anonymous

What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding
May 31, 2013 by jo

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 Sally

Write a net ionic equation for the reaction that occurs when excess nitric acid (aq) and potassium sulfite (aq) are combined. Note: Sulfites follow the same solubility trends as sulfates.
October 27, 2015 by jim

What is the equilibrium constant for the following reaction? 3A + 2B <---> 2C
August 4, 2008 by kayla

Chem Titration and pH
Calculate the pH at 0mL, 5mL,...40mL for a 10.0mL aliquote of 0.100M Na3AsO4 (weak base) titrated with 0.100M HCl pKa1 = 2.25 pKa2 = 6.77 pKa3 = 11.60 Thank you First you should write equations to know where we are in the titration. At the beginning, we have the hydrolysis of ...
October 7, 2006 by julie

Consider the exothermic reaction CoCl42-(aq) + 6 H2O(l) --> Co(H2O)62+(aq) + 4 Cl -(aq). Will the equilibrium concentration of CoCl42- increase or decrease when the following changes occur? (a) HCl is added. increases decreases .(b) Co(NO3)2 is added. increases decreases .(...
April 19, 2011 by Rebekah

(a) (i) Draw the abbreviated structural formula, in truncated form, of the compound that would be produced from the reaction of one molecule of glycerol with one molecule each of A, B and C .Circle and name the new functional group(s) produced. What type of reaction is ...
September 15, 2011 by mj

Analytical Chem
Determine [Zn2 ], [CN], and [HCN] in a saturated solution of Zn(CN)2 with a fixed pH of 2.390. The Ksp for Zn(CN)2 is 3.0 1016. The Ka for HCN is 6.2 1010. I know the following is what needs to be done, but im unsure of how to go about it. 1. Write the pertinent ...
September 16, 2014 by Anonymous

When carbon dioxide is heated in a closed container, it decomposes into carbon monoxide and oxygen according to the following equilibrium equation: 2CO2(g) ---> 2CO(g) + O2(g) When 2.0 mol of CO2(g) is placed in a 5.0-L closed container andheated to a particular temperature...
March 30, 2008 by Thomas

Describe the process by which adding potassium hydroxide to a saturated aluminum hydroxide solution reduces the concentration of aluminum ions. Write the solubility equilibrium equation and solubility product constant expression for a saturated aqueous solution of aluminum ...
May 18, 2010 by Alex

The equilibrium under investigation is : H2CO3(aq) * H2O(l) + CO2(g) How does the pulling and pushing of the plunger affects the equilibrium? Is it consistent with LeChatelier's principle? my answer is that if you push you increase the pressure volume decrease and the ...
November 26, 2012 by andrew78

Organic Chem
Im not really sure how to begin with this question.. 1. The synthesis of toluene by the aluminum chloride-catalyzed Friedel-Crafts alkylation of benzene is badly complicated by the formation of di-, tri-, and polymethylated benzenes. A simple solution to the synthesis of ...
February 11, 2015 by Maura

English help
1. Which of the following sentences is written in the active voice? A.) The wedding dress was sewn by Katie. B.) The red barn was painted by the farmer. C.) The boy jumped on the trampoline.*** D.) The chocolate cake will be served to the queen. 2. Which of the following ...
August 14, 2014 by Cassie

Which of the following solutions bathing a red blood cell would be considered isotonic? Which of the following solutions bathing a red blood cell would be considered isotonic? a solution containing 300 mM NaCl a solution containing 150 mM glucose a solution containing 400 mOsm...
February 19, 2015 by Anonymous

Molecular cell Biology
The following chemicals have the indicated formula weights:Sucrose-342.3,Potassium dihydrogen phosphate(KH2PO40-136.09,Tris -121.14.You also have the following solutions made:20%SDS,5M NaCl,500mM EDTA.You have a 40%glycerol solution and 10X TBE.List the steps to make the ...
January 18, 2014 by Caroline

Which one of the following subcategories of the E/M section has separate codes for new and established patients? A. Office or Other Outpatient Services B. Hospital Observation Services C. Initial Inpatient Consultation D. Emergency Department Services
February 15, 2010 by Joe

how many moles of NaOH (aq) is contained in 10.0mL of vinegar?
August 31, 2011 by cleetus

2. Suppose that firms in an industry have the following cost function: C = 100 + 0.25q2, and the industry faces an inverse demand curve of P = 90 2Q. a. I f the industry is competitive, find the long-run equilibrium price, quantity, and profit of a typical firm. How many ...
November 18, 2011 by jay

integrated physics and chemistry
what is the main ingredient in 22-karet gold? is it copper,tin,gold,or steel?
November 7, 2009 by logan

ingredient is 240ug/ml in a 100ml bottle,use 15ml at a time,how many mls of ingredint in 15ml
April 29, 2010 by bruno

a bank account earns 7% annual interest compounded continuously. you deposit $10,000 in the account, and withdraw money continuously from the account at a rate of $1000 per year. a. write the differential equation for the balance, B, in the account after t years b. what is the...
March 14, 2011 by Anonymous

I have a lab question that is asking if the soda ash in our analysis was NaHCO3 instead of Na2CO3, how would the volume of acid added change from (a) the starting point to the phenolphthalein end point? (b) the phenolphthalein end point to the bromocresol green end point? (c) ...
October 13, 2015 by Rachel

MF015 59 What is the acid dissociation constant for HA if pH = 2.74? [HA] = 0.020M? MF12063: What is the minimum energy barrier that musts be overcome for a chemical reaction to occur? is it the activation energy? yes
May 1, 2007 by sam

How many grams of hydrochloric acid are required to react completely with 4.30 grams of zinc? I got 4.80g HCl for the answer but do not know how to do part 2 which is, How many molecules of a gas will be produced? Thanks.
October 21, 2007 by lucy

The pKa values of acetylene, ehtylene and ethane are 25, 44 and 50 respectively. This means that acetylene is the strongest acid of the three.Explain the order of acidity for the above hydrocarbons
November 4, 2007 by Delli

which kind of fatty acid would the cell manufacture in order to keep the cell memmbrane rigid or study under warm enviromental conditions
February 17, 2008 by kim

Hydrogen gas is produced when zinc reacts with hydrochloric acid. if the actual yeild of this reaction is 85%, how many grams of zinc are needed to produce 112L of H2 at STP?
June 10, 2008 by Miley

How do you calculate the volume of titrant needed to reach the endpoint of a reaction when you are given the mls and molarity of a strong base and only the molarity of a weak acid?
April 10, 2009 by Annie

organic chemistry
Some biphenyl (C6H5-C6H5) is produced as a by-product in the synthesis of benzoic acid. Where does it come from? This question has to deal with the Grignard reaction. Can anyone help me with this please?
May 27, 2009 by Jimmy

what causes an acid-base reaction to occur? (hint: think about the products that form) I know salt and water form but I dont know why it happens...
October 1, 2009 by Alexa

In some solid calcium carbonate samples, calcium bicarbonate, Ca(HCO3)2, is also present. Write a balanced euation for its reaction with hydrochloric acid.
March 8, 2010 by jEFFREY

How much 0.150 M sodium hydroxide would be required to just neutralize 15 mL of 0.175M hydrochloric acid? 15mL x 0.150M/0.175M=12mL correct!
June 29, 2010 by Jetta

A quick chem question reguarding acids and bases: The questions says: "a very strong acid has a very weak base. Critique this statement."
May 19, 2011 by Miriam Wyman

chemistry hw help please ASAP
if 25.2 g of aluminum (AW=27.0) are mixed with 125 g of sulfuric acid(MM=98.1)then how many grams of aluminum sulfate will be produced? 2Al+ 3 H2SO4 --> 3H2 + Al2(SO4)3
November 29, 2011 by ally

How many moles of potassium hydroxide are required to neutralize 1.25 mol of phosphoric acid? H3PO4 + 3KOH -> K3PO4 +3H2O I got 0.42 mol KOH , is this correct? thanks!
May 8, 2013 by Anonymous

Chemisty (How do I calculate)
What is the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 16396 J of heat?
June 27, 2013 by Mary

Chem Lab
What is the Molar Enthalpy of Neutralization (Hn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 2033 J of heat?
November 17, 2013 by brittany sheats

Nitric acid reacts with silver metal: 4HNO3+3Ag yields NO+2H2O+3 AgNO3. Calculate the number of grams of NO formed when 10.8 g of Ag reacts with 12.6g of HNO3.
December 3, 2013 by Anonymous

Give the formula for the conjugate base of each acid. A.HSO4- B.H3PO4 C.HPO42- I have my answers as h2so4 h2po4 h2po4- my answrers are wrong, please help
March 18, 2014 by Danny

What would be the procedure for titrating a beverage to determine the concemtration of weak acid? What reagents would be needed? What appropiate measurements and observations must be made?
April 1, 2015 by Anonymous

a student determines the molar mass of methanol by the method used in this experiment. she found that the equilibrium temperature of a mixture of ice and pure water was .4 degrees Celsius on her thermometer. when she added 10g of her sample to the mixture, the temperature, ...
May 22, 2012 by liz

chemistry... HELP
Equilibrium constant question!!!? Standard reduction potentials Reduction half-reaction E(V) Ag+(aq) + e- ---> Ag (s) 0.80 Cu ^2+ (aq) + 2e- ---> Cu (s) 0.34 Sn^4+(aq) + 4e- ---> Sn (s) 0.15 2 H+(aq) + 2e- ---> H2 (g) 0 Ni^2+(aq) + 2e- ---> Ni (s) -0.26 Fe^2+ (...
November 3, 2012 by Ann

pcl3(g) cl2(g) <--- pcl5(g) Energy Some PCl3 and Cl2 are mixed in a container at 200 degrees celius and the system reaches equilibrium according to the equation above. Which of the following causes and increase in the number of moles of PCl5 present at equilibrium? I. ...
April 16, 2015 by Marie

organic chemistry
Which has a higher Rf value Ibuprofen or mefenamic acid? please please please.i need your answers.
December 27, 2008 by lou

Why is HC3HO considered a weak acid? Why is NaOH considered a strong base? Why is Mg(NO3)2 considered a salt?
February 11, 2010 by keisha

The pH of a 25.0 mL sample of a buffer changed by one unit when 4.19 mL of 0.24 M HCl was added to it. What is the acid buffer capacity of this buffer?
February 5, 2015 by Cole

600 gallons of 15 M nitric acid were added to a lake. The initial pH of the lake was 5.90 and the final pH was 3.70. What is the volume of the lake?
March 13, 2015 by mar

in which of the following sentence is the verb in the active voice?a.the boy was called by his mother. b.we were told that jim is ill. c.the telephone bill was paid yesterday.d.the mother called her son for lunch.
February 20, 2013 by bianca

How would you make up 255 mL of 0.150 M HNO3 from nitric acid that is 68.0% HNO3? The density of 68.0% HNO3 is 1.41 g/mL.
July 30, 2011 by Henry

if 50 grams of sodium hydroxide mixed with 25 grams of hydrochloric acid how many grams of salt can be formed?
January 12, 2015 by Anonymous

Solve the following system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions. x-3y=5 2x-6y=10
May 2, 2012 by ,algebra

Solve the following system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions x-y=4 3x-5=2
May 2, 2012 by ,algebra

A 230.-mL sample of a 0.280 M CaCl2 solution is left on a hot plate overnight; the following morning, the solution is 1.10 M. What volume of water evaporated from the 0.280 M CaCl2 solution?
June 21, 2013 by Ashley

can u tell me of any laboratory acid with 6 letters 1st letter is n 4th letter is r and 6th letter is u, i dont no, it is for a wordsearch
November 6, 2007 by !!ezr!!

select one acid, one base, and one salt and describe specifically how and where they are used in therapeutic processes.
May 6, 2015 by bob

College Chemistry
What is the pH of the following solutions? 1)a solution that is 5.410−2 M in HClO4 and 3.010−2 M in HCl 2)a solution that is 1.80% HCl by mass (Assume a density of 1.01g/mL for the solution.) Please help! I am so confused!
March 7, 2010 by Katie

What is the concentration of ammonia in a solution that is .500 M NH4Cl and in which the solubility of Mg(OH)2 is 1.0x10^-3 M? Ksp for Mg(OH)2 is 6.3x10^-10. Write the equilibrium equation and calculate the overall K.
November 18, 2010 by Anonymous

math algebra
Solve the following system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions. -a+b=-4 2a-3b=-2
May 3, 2012 by jorge

world history
Which of the following is true of the Antarctic Treaty System? A. It bans commercial mining in Antarctica. B. It's actually the Society for the Geographic Exploration of Antarctica. C. It was established specifically to enforce ecological regulations. D. It provides the de ...
November 19, 2013 by Brianna

What is the key ingredient for electromagnetic induction? A) Motion.B) Energy.C) Force.D) Magnetic charge.E) Electric charge.
April 17, 2012 by Phillip

Chem SCC
Complete this equation for the reaction of NaHCO3(s) + HC2H3O2(aq) ---> Include phase symbols.
July 15, 2012 by Anonymous

Chem SCC
Complete this equation for the reaction of NaHCO3(s) + HC2H3O2(aq) ---> Include phase symbols.
July 15, 2012 by Anonymous

Why is the freezing point depression of potassium ethanoate greater than that of camphor or urea (in benzoic acid), with equal moles of each? Wouldn't the Kethanoate break up into two ions per molecule?
February 10, 2007 by Edward

Org. Chem.
Is malonic acid polar or nonpolar? and does it hydrogen bond with water? with methyl alcohol? with hexane? I keep getting different results and would like some help please with explanation.
September 14, 2009 by Chelsea

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: c.two d.three Can you also explain why you choose your answer to this question...thanks
March 25, 2010 by josh

Grade 12 Biology
If a life-form has six different bases-ABCDEFG. the percentage composition of A,B and C is same as EFG. Hypothesis the structure of the nucleic acid. I TRIED the search engine but didnt help, please help!
May 9, 2011 by sabrina

Predict a reasonable melting point of a mixture prepared by combining 25mg of biphenyl (mp=70-71C) with 75mg of acetyl salicylic acid (mp=138-140C). Answer should have temps in it.
September 15, 2011 by katie

Organic Chem
adding one equivalent of sulfuric acid to 2,4-hexadiene gives 2 possible products. Give the structure and write all steps in the reaction mechanism that explains how each product is formed
August 4, 2013 by Lisa

500.0 mL of 0.120 M NaOH is added to 595 mL of 0.250 M weak acid (Ka = 2.95 10-5). What is the pH of the resulting buffer? The answer that i got using HH equation is 4.14 but apparently it's wrong. Am I approaching this problem from a different angle ?
September 24, 2015 by Owen

A 0.21g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25 litre of final solution. Calculate the hydrogen ion concentration in mol1-1 in this solution and show successive steps in the calculation: If 0.21g in 0.25l then 0.84g in 1l.You multiplied...
March 12, 2007 by Anthony

why is HS- a stronger BL base compared to HSO4 In a series of oxybases with the same central atom, the base with more O atoms is stronger. In a series of oxybases with the same central atom, the base with less O atoms is stronger. Since H2SO4 is one of the seven strong acids, ...
February 26, 2013 by Hannah

In a previous experiment, 0.800 g of the green complex iron salt was placed in an Erlenmeyer flask and heated with concentrated sulfuric acid until all oxalate ion was destroyed (CO2, SO2 and H2O are formed). Ferric ion (Fe3+) remained in solution and was reduced to Fe2+ by ...
May 7, 2007 by Linda

Calculate [Fe^2]+ when the cell reaction reaches equilibrium? A voltaic cell is constructed based on the following reaction and initial concentrations: Fe^2+,( 0.0055 M ) + Ag+,( 2.5 M ) ----> Fe^3+,( 0.0055 M ) + Ag(s) Calculate [Fe^2]+ when the cell reaction reaches ...
March 27, 2009 by Sandra

What is the balanced equations for: .Calcium and ethanol .Potassium dichromate, Dilute Sulphuric Acid and Ethanol .Ethanol abd oxygen
May 28, 2010 by Disturbed student

16.7 grams of chlorine gas are allowed to react with with 3.31 grams of water What is the maximum amount of hydrochloric acid that can be formed in grams
December 4, 2010 by Austin Jekins

chem: equilibrium
In which direction does the equilibrium shift for the following reaction? SO2(g) + NO2 (g) <-> SO3(g0 + NO(g) + 42 KJ a. temperature increases b. pressure increases c. [SO2] increases d. [NO2] increases e. temperature decreases f. [No] increases Im confused on knowing ...
May 14, 2012 by bkue

Analytical chem
Cu+ reacts with neocuproine to form the coloured complex (neocuproine)2Cu+, with an absorption maximum at 454 nm. Neocuproine is particularly useful because it reacts with few other metals. The copper complex is soluble in 3-methyl-1-butanol, an organic solvent that does not ...
June 24, 2014 by panchi

An object of mass m=80 kg moves in one dimension subject to the potential energy U(x)=(λ/4)(x^2-a^2)^2+(b/2)x^2 Here we use λ=3kg/(m^2s^2), a=7m, and b=77kg/s^2. (b) Find a stable equilibrium point x0 such that x0 is positive. (in meters) x0= (c) Do a Taylor expansion of the...
November 1, 2013 by keitanako

Lead metal is added to 0.100M Cr3+(aq) Pb(s) + 2Cr3+(aq) -> Pb2+(aq) + Cr2+(aq) What is [Pb3+] when equilibrium is reached? What is [Cr2+] when equilibrium is reached? What is [Cr3+] when equilibrium is reached? any help is appreciated
February 9, 2009 by skyblue12

Chemical Kinetics Lab - Ascorbic Acid Reduction of Iron (III) The object of this experiment was to determine a rate law and a rate constant. The reaction that was studied was: 2 Fe(CN)6 ^-3 + C6H8O6 = 2 Fe(CN)6 ^-4 + C6H8O6 + 2H ^+ Summary of obtained values: m = 1 n = 1 k = ....
November 12, 2012 by Amy

How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? Answered abovd.
March 5, 2007 by Beautiful

Hers's a question im not sure how to do Write a mechanism for the acid-catalyzed transesterification reaction of ethyl acetate with 1-butanol, which gives butyl acetate. Thank you soo much!!!!!!!!!!!!!!!!!!!!!!
August 25, 2007 by manny

Hexanoic acid (structure below to my best ability) is only slightly soluble in water but is readily soluble (with stirring and shaking) in both 0.6 M NaHCO3 and 2.5 M NaOH. O || /\/\/ \ OH
February 3, 2009 by Nina

Could someone please direct me to a website that explains why acid-base titration is a useful technique in chemistry. Or offer your own opinions. Thanks ahead of time for any input!
March 4, 2009 by Jake

when benzoic acid and quinine is dissolved to dichlromethane and 2M NaOh, what is the organic layer being formed? (i have sodium benzoate as aqueous layer of the product. is this right?)
April 1, 2009 by Nancy

How many moles of excess reactant are present when 3.50 x 10^2 mL of 0.216 M sulfuric acid reacts with 0.510 L of 0.202 M sodium hydroxide to form water and aqueous sodium sulfate?
September 19, 2009 by larry

Fumaric acid, which occurs in many plants, contains, by mass, 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen. A 0.050-mol sample of this compound weighs 5.80 g. The molecular formula of this compound is
October 6, 2009 by Tierney

How many moles of excess reactant when 338mL of 0.226M sulfuric acid reacts with 0.493L of 0.211M sodium hydroxide to form water and aqueous sodium sulfate?
December 3, 2009 by Lindsey

The problem on my homework is: What mass in grams of iron metal is required to react with 2.50 L of .1500 M of sulfuric acid to produce 18.35g of iron (III) sulfate? please help!
May 23, 2010 by Lauren

Organic Chemistry
Design a flowchart for the separation of a mixture that contains toluic acid, p-bromo-aniline, and anthracene. Whenever a reaction occurs, write the reaction completely.
October 3, 2010 by Jessica

I have my results from a simple titration experiment (sodium carbonate against hydrochloric acid) Average titre of 53.27 cm3 which i am happy with but how can i reason that my results are accurate?
October 15, 2010 by Charlie

i would like to know if you could help me figure out the blanks of this question. The pH scale ranges from __ to __.Pure water is ___. An acid is ______ 7 and a base is __________ 7. If you could let me know that would be great thanks
November 10, 2010 by virginia

classify in as many ways possible 2 Rb(s) + Br2(g) --> 2 RbBr(s) acid-base double-displacement gas evolution oxidation-reduction precipitation single-displacement synthesis thanks
November 29, 2010 by rebekah

Find the mass of sodium hydroxide needed to neutralize enough nitric acid to create 2.0 grams of sodium nitrate? How do I write out equation and solve?
November 30, 2010 by Tosha

calculate the theoretical mass (g) of hydorgen chloride formed in the reaction of sulfuric acid (2.00 mol) with sodium chloride (150g) 2NaCl(s) + H2SO4(aq) = 2HCl (g) + NaSo4(S)
December 7, 2011 by payton

The triation of 50.00 mL of 0.025 00 M MES with 0.100 0 M NaOH. MES is a weak acid with pKa=6.27. Compute Ve, first. Show what happens at the four stages of the titration: Va = 0,2,5,10,10.1,11,12, and 12.2 mL. I NEED HELP!!!!
April 11, 2012 by Lance

The products of the reaction between zinc and sulfuric acid are zinc sulfate, hydrogen sulfide, and water. Balance the equation using the electron-transfer method.
November 6, 2012 by Zach

chemistry characterization & analysis of aspirin
write a balanced equation that describes an acid base reaction that would allow you to determine the moles of aspirin present in a sample
November 13, 2012 by molly

For acids of the same general structure but differing electronegativities of the central atoms, acid strength decreases with increasing electronegativity of the central atom. True or false
November 15, 2012 by Josh G.

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