Number of results: 33,654
calculate the equilibrium constant for the reactionas written at 940K. NH4Cl->NH3+HCl delta H= NH4Cl -1779, NH3 -46, HCl -92 delta s= NH4Cl - 682,NH3 192,HCl 187 i dont know how to solve for the equilibrium constant without the concentration of the values???
April 14, 2008 by david
What is the pH of the solution created by combining 11.40 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? Here is the chart that i am supposed fill out: mL NaOH pH w/ HCl pH w/ HC2H3O2 11.40 _________ ____________ Here's ...
April 27, 2009 by Lisa
Magnesium reacts with HCl to produce magnesium chloride and hydrogen gas. Mg(s)+2HCl(aq)->MgCl2(aq)+H2(g). What is the molarity of the HCl solution if 330 ml of the HCl solution reacts with magnesium to produce 7.40 L of H2 gas measured at STP?
October 9, 2010 by Dana
Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0◊ 10Ė4. Methylamine is a weak base and reacts with HCl to give the methylammonium ion. HCl + CH3NH2 <---> CH3NH3^+ + Cl^- 0.160M 0....
February 27, 2013 by Sam
If in an experiment we're working with Mg, HCl acid, and H20. We stick the magnesium in the acid mixed with water and the Mg dissolves. One of the products is hydrogen gas. If the water in the tube is evaporated, the other product, a white salt remains. Write a balanced ...
October 22, 2006 by Justyna
Suppose you are studying coordination compounds of Co(II) with the ligand pyridine (py, C5H5N, MW = 79.10). You isolate a crystalline compound and since the only available ions are chloride and nitrate, you hypothesize the empirical formula of the coordinaton compound must be ...
April 23, 2007 by Olivia
In an action movie the lead character must jump off a balcony at an angle of 20 degrees, 10 meters above the ground and land in a window 3 meters away and 8.5 metters abover the ground. What should the velocity be in order to make this jump? How long is the stunt double in the...
October 6, 2011 by Anonymous
In an action movie the lead character must jump off a balcony at an angle of 20 degrees, 10 meters above the ground and land in a window 3 meters away and 8.5 metters abover the ground. What should the velocity be in order to make this jump? How long is the stunt double in ...
October 6, 2011 by 201
A sloution of calcium nitrate, C(NO3), reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(ag). When 45.00 mL of 4.8724 x 10 -1M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 10 -1M NH4F solution, 1.524g ...
February 10, 2010 by Macey
A co-op student designed an experiment to collect hydrogen gas by reacting iron with a hydrochloric acid (HCl) solution. The studentís co-op supervisor suggested that aluminum can also be included to generate hydrogen gas: Fe + 2 HCl → 2 FeCl2 + H2 2 Al + 6 HCl → 2...
October 17, 2014 by Brooke
(Please help) Math
1) initial investment = $600 annual % rate = ? time to double = ? amount after 10 years = $19,205.00 19,205 = 600e^(10r) I do not know how to solve for r of find the time to double.
February 9, 2010 by Hannah
Imagine that you are in chemistry lab and need to make 1.00 of a solution with a pH of 2.50. You have in front of you 100 of 7.00◊10−2 , HCL 100 of 5.00◊10−2 , and NaOH plenty of distilled water. You start to add HCL to a beaker of water when someone asks you a ...
March 10, 2009 by Ashley
Find the pH and pOH of a solution that is 1.04x10^-4 M HCl. Do i have to use an ice table to solve this? or is there a short cut? please help No. HCl is a strong acid (100% ionized), so the H^+ concentration is 1.04 x 10^-4 M.
July 4, 2007 by T
Draw the condensed structural formula for the products of the acid hydrolysis of the following amide with HCl: CH3-CH2-C(=O)-NH2 + H2O + HCl ---> I'm afraid I don't even know where to begin with this one, help!
November 24, 2010 by Lindsay
physics practical investigation
Plan,design and conduct an investion to find out whether the amount of heat produced will depend on increase on concentration of Hcl when Hcl reacts with an excess zn.
March 25, 2013 by Jossie
How many milliliters of 0.0050 N KOH are required to neutralize 19 mL of 0.0050 N H2SO4? How many milliliters of 0.0050 N KOH are required to neutralize 19 mL of 0.0050 N HCl?
April 5, 2010 by Anonymous
Which of the following mixtures will be a buffer when dissolved in 1 liter of water? 0.10 mol Ba(OH)2 and 0.20 mol HCl 0.30 mol KCl and 0.30 mol HCl 0.40 mol NH3 and 0.40 mol HCl 0.20 mol HNO2 and 0.10 mol NaOH 0.20 mol HBr and 0.10 mol KOH My answer is that HNO2 and NaOH will...
April 8, 2012 by Hannah
A student must make 500 mL of a 1.5 M HCl solution. The student has plenty of water and a stock solution of 6.0 M HCl to use. What volume of the 6.0 M HCl solution must be added to what volume of water to make the desired 500 mL of 1.5 M solution? I don't really know how to ...
March 8, 2009 by Katie
What is the pH of the solution created by combining 1.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? This is how I would go about solving the problem, but could you tell me where I went wrong? First I would find the number of mols of OH from NaOH and then use...
May 4, 2008 by Marie
The solubility of KNO3 is 80g/100g water at 50 degrees and 10g/100g water at 0 degrees. The solubility of CuSO4 is 60g/100g water at 50 degrees and 20g/100g water at 0 degrees. A mixture contains 13.8g of KNO3 and 1.94g of CuSO4. A) Calculate the minimum mass of water that ...
October 6, 2014 by Lauren
Evaluate the surface integral. the double integral of (x^2 + y^2 + z^2)dS over Region S. S is the part of the cylinder that lies between the planes z = 0 and z = 5, together with its top and bottom disks Can anyone help?
November 6, 2013 by Q
"Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of the following aqueous solution: CuBr2(aq)" Possible oxidation reactions: 1. 2Br- -> Br2 + 2e- = -1.09 2. 2H2O -> O2 + 4H+ + 4e- = -1.23 Possible reduction reactions: 1. ...
April 2, 2014 by Kate
I was supposed to figure out whether the following equations produced precipitates or not. Here are my answers, but I know that they are wrong. So I still can't figure out where I'm messing up...? Please help! HgCl2 (aq) + K2CrO4 (aq) = Yes Ba(OH)2 (aq) + NaClO3 (aq) = No ZnI2...
January 13, 2008 by Cierra
a box contain five silp of paper marked 1,2,3,4and5 tow silp are selected without replacement,list the possible vaule for each of following random variable the sum of two number on two silp the difference between the first and second number
April 18, 2014 by shumaila.imtiaz
Alumminum hydroxide reacts with sulfuric acid as follows: 2Al(OH)3+H2SO4-->Al2(SO4)+6H2O. Which reagent is the limiting reactant when 0.500 mol Al(OH)3 and 0.500 mol H2SO4 are allowed to react? How many moles of Al2(SO4)3 can form under these conditions? How many moles of ...
October 29, 2010 by Chris Sung
The purity of a pharmaceutical preparation of sulfanilamide, C6H4N2O2S, can be determined by oxidizing the sulfur to SO2 and bubbling the SO2 through H2O2 to produce H2SO4. The acid is then titrated with standard NaOH. Calculate the purity (%w/w sulfanilamide) given that 1.457...
February 15, 2012 by darren
In this lab experiment you will make 100.0 mL of a 0.100 M solution of Co(NO3)2. However you must calculate the number of moles of compound that will be needed (moles= Molarity x Liters).Then calculate the mass of Co(NO3)2 that will need to be weighed out (mass= moles x molar ...
November 19, 2012 by Melissa
A solid is known to be either BaCO3 or CaCO3. It is dissolved in 6 M acetic acid. A pale yellow precipitate forms when K2CrO4 solution is added. The subsequent flame test with that precipitate shows an orange-red color. Which cation is present? Briefly explain
March 22, 2013 by Anonymous
If 35.0 mL of 0.210 M HCl reacts with excess Mg, how many mL of hydrogen gas are produced at STP? Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) Is the answer 2.352 STP converted mols HCl to mols H2 gas: 02.10 M HCl x 1 mol H2/2 mol HCl = 0.105 mol H2 converted mols H2 gas to L: 0...
November 22, 2014 by Mike
Where does energy come from? Energy can come from the complete destruction of matter (as in nuclear reactions), or the rearrangement of electrons or other charged particles inside matter (as in chemical reactions) or from electromagetic fields (as in light and heat radiation...
July 24, 2006 by Sandra
I'm trying to do this precipitation reaction problem, but I don't understand part of it. The question is: Does a precipitate form when aq. soultions of potassium nitrate (KNO3) and sodium iodide (NaI) are mixed? Then it lists the solutions for the two: KNO3(aq) --> K+(aq...
November 30, 2012 by Emily
ANTACID TABLET OF WEIGHT 1.3183G WAS DISSOLVED IN 75 MLOF CONC. HCl OF 0.1807M IS TITRATED WITH 20.36ML OF CONC. NaOH OF 0.1481M . FIND MILIMOLES OF HCl ADDED, FIND MILIMOLES OF NaOH USED IN TITRATION, FIND MILIMOLES OF HCl THAT DID NOT REACT WITH ANTACID, FIND MILIMOLES OF ...
October 16, 2011 by Anonymous
100 mL of each of the following solutions is mixed; which one of the mixed solutions is a buffer? A) 1.0 M NH3(aq) + 0.6 M KOH(aq) B) 1.0 M NH4Cl(aq) + 1.0 M KOH(aq) C) 1.0 M NH3(aq) + 0.4 M HCl(aq) D) 1.0 M NH4Cl(aq) + 0.4 M HCl(aq) E) 1.0 M NH3(aq) + 1.0 M HCl(aq) I am ...
March 14, 2010 by Trixie
how many mililiters of a 0.27 M HCl solution are needed to react completely with 2.7 g of zinc to form zinc (II) chloride?" equation. 2 HCl + 1 Zn -----> 1 ZnCl2 + 1 H2
July 12, 2010 by Nicole
What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9? Who helps me to solve it for me.
August 4, 2012 by Fai
anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?
February 13, 2013 by m
A student cleaned a crucible with HCl. After pouring the HCl into the waste container, the crucible was neither rinsed with water or dried before the student added the NaHCO3 and KCl mixture. The crucible contained some residual HCl. How would this experimental error affect ...
February 2, 2014 by Sandy
A mixture of CaCO3 and MgCO3 weighing 7.85 g was reacted with excess HCL. The reactions are CaCO3+2HCL=CaCl2+H2O+CO2 and MgCO3+2HCl=MgCl2+H2O+CO2. The sample reacted completely to produce 1.94 L CO2 at 25 degrees C and 785 torr. Calculate the percentage of CaCO3 and MgCO3 in ...
October 17, 2010 by Sue
Hey, can you help me on this question: Question: A 2.3 kg iron object is placed in an oxygenated tank of 1.00 mol/L hydrochloric acid. What volume of hydrochloric acid would react to completely consume the iron object? My question: when I seperate the H and Cl, and make the ...
July 17, 2006 by Dave
Either my online portal hates me, or I don't understand how to balance properly. QUESTION Balance reaction of arsenic(III) sulfide with nitric acid As2S3(s) + NO3-(aq) → H3AsO4(aq) + S(s) + NO(g) Is this the correct balanced equation? 32 H2O + 24 As2S3(s) + 80 H+(aq) + ...
June 21, 2013 by Sara
Can you please explain further because I don't understand? Posted by Mary on Wednesday, November 14, 2007 at 4:23pm. A wavelength of 625 nm is used in a Young's double-slit experiment. The separation between the slits is d = 1.3 10-5 m. The total width of the screen is 0.20 m...
November 14, 2007 by Mary
You push a 45 kg wooden box across a wooden floor at a constant speed of 1.0 m/s. The coefficient of kinetic friction is 0.15. Now you double the force on the box. How long would it take for the velocity of the crate to double to 2.0 m/s?
November 21, 2009 by christina
gr. 12 english - Double Negatives and Modifiers
I'm going to ask for a little help tonight. Does the following sentence have double negatives, misplaced or dangling modifiers? "I left my agenda in a restaurant which had all my important dates in it."
February 10, 2010 by AL 87
Calculate the pH of a 25 mL sample of distilled water after the addition of 1 mL, 2 mL, 3 mL, 4 mL, and 5 mL of NaOH and HCL. (0.1 M HCl and NaOH) In total, you need to show 10 calculations.
March 14, 2011 by Mariah
Hydrochloric acid is sold as a concentrated acqueous solution. If the molarity of HCl is 12.0 and its density is 1.18 g/ml. calculate A) MOLALITY B)THE % BY MASS OF HCl in the solution
May 11, 2011 by Daniel Forero
If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu]
October 29, 2011 by Chemistry Chick
For the balanced reaction HCl(aq) + NaOH(aq) ? H2O(l) + NaCl(aq), how many moles of H2O could be produced from 25 g HCl? (You have already done this type of question!
November 29, 2011 by valarie
You have 26.44 mL of 1.83 M HCl in a beaker. You dilute this acid with 40.08 mL of water. When you analyze the solution you find that the number of moles of HCl in the new solution is
December 5, 2011 by Anonymous
Calculate the pH when the following volumes of 0.20 M LiOH are added into 50 mL of a 0.1 M HCl solution. Both LiOH and HCl are strong electrolytes. a) 0 mL b) 10 mL c) 24.6 mL d) 25 mL e) 25.6 mL f) 30 mL g) 40 mL
May 8, 2012 by Dauren
1) ZnSO4 would it be Zn(SO4) does the polyatomic ion always have to have ( ) ? 2) Is Ba(SO4) right? since Ba is 2+ and SO4 is 2- right? 3) In a net ionic equation for BaCI2 would it become Ba ^(2+) + 2CI or Ba ^(2+) + CI2 ?
September 8, 2010 by Amy~
A student placed a mixture of BaO and CaO in a 1.46L flask containing carbon dioxide at 35C and 746mmHg. After the reactions were complete she found that the CO2 pressure had dropped to 2.40 x 10^2mmHg. How many moles of CO2 were consumed in the reactions? Assume volumes of ...
March 3, 2010 by Staci
what is the complete & balanced equation for the following reactions & include the catalysts if any: 1. Combustion of Methane: 2. Halogenation of Cyclopentene with Br2 4. Hydrogenation of 3-methyl-1-butyne 5. Combustion of 2-methylpropene 6. Hydrohalogenation reaction between ...
February 4, 2014 by Jessie
The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ?????? M. The density of the solution is 0.79 g/mL. A) 21 B) 0.93 C) 6.0 ◊ 10-4 D) 1.72 E) 0.58
September 26, 2010 by benju
My problem is calculate the molarity of HCl and NaOH (molarity of acid)x(volume of acid)=(molarity of base)+(volume of added base) HCl=acid NaOH=base HCl volume = 25mL=0.025L NaOH=67.05mL=0.06705 molarity = moles of solute Liters of a solution M=0.015000 moles of NaOH 0.06705L...
February 19, 2008 by Chemistry
My problem is calculate the molarity of HCl and NaOH. (molarity of acid)x(volume of acid)=(molarity of base)+(volume of added base) HCl=acid NaOH=base HCl volume = 25mL=0.025L NaOH=67.05mL=0.06705 molarity = moles of solute Liters of a solution M=0.015000 moles of NaOH 0....
February 19, 2008 by Brad