Wednesday
April 16, 2014

Search: a mixture of potassium chloride and potassium bromide weighing 3.595 g

Number of results: 7,771

chemistry
Potassium has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate needs to dissolve in water to absorb 114 kJ of heat?
Friday, September 2, 2011 at 2:35pm by Lola

chemistry
Potassium has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate needs to dissolve in water to absorb 114 kJ of heat?
Friday, September 2, 2011 at 3:22pm by Lola

Chemistry
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5
Monday, October 25, 2010 at 12:10am by Pierre

Chemistry
how many grams of potassium bromide could be recovered by evaporating 650 grams of 15 perentKBr solution to dryness...... 650 * (.15) = 97.5 is this correct
Monday, October 25, 2010 at 2:07am by Pierre

Chemistry
Give the molecular, complete ionic, and net ionic equations for the combination of potassium chloride and magnesium sulfate.
Wednesday, March 23, 2011 at 11:22pm by Bruce

chemistry
Potassium ion is K^+ Acetate ion is C2H3O2^- Potassium acetate is KC2H3O2.
Thursday, November 3, 2011 at 1:13pm by DrBob222

Chemistry Check
Just want to make sure that my thought process is right on this one. 5 compounds: n-butyl chloride n-butyl bromide sec-butyl chloride tert-butyl chloride and crotyl chloride Each is reacted with NaI (SN2?) and AgNO3 (SN1?) And we have to rank the reaction time and wether we ...
Friday, November 8, 2013 at 2:28am by ramire2

chem quantity
a sample of soil containing hydrated barium chloride potassium chloride plus inert material weighd 0.8076g. tha sample was then dissolvd in water n treated with silver nitrate.tha resulting precipitate was collectd n found to weigh 0.5846g. calculate tha percentage of precipitate
Sunday, September 15, 2013 at 4:19am by shanice

Chemistry
how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?
Thursday, February 6, 2014 at 8:19pm by Ben

Chemistry
50 mL of 1M silver Nitrate is combined with 25 mL of 2 M potassium Chloride. What is the concentration of a resulting solution
Tuesday, February 2, 2010 at 8:48pm by Chris

chemistry
What physical properties of calcium chloride, citric acid, sodium iodide, potassium iodide, and sucrose have in common?
Monday, February 3, 2014 at 8:41pm by ashley

CHEMISTRY
Write equations for the solution process when ech of the following is dissolved in water. Potassium phosphate glucose Calcium chloride 1-propanol Butanone Ammonium sulfite
Tuesday, February 14, 2012 at 8:16pm by Sarah

Chemistry
Halogens are F2, Cl2, Br2, I2. Add F2 to chloride, bromide, and iodide salts. Add Cl2 to fluoride, bromide, iodide salts. Add Br2 to fluoride, chloride, iodide salts. Add I2 to fluoride, chloride, bromide salts. The more active halogen will displace less active halide below it.
Sunday, November 7, 2010 at 4:36pm by DrBob222

Chemistry
1)20 mL of a saturated of potassium nitrae at 50oC. Approximately, what mass of solid will precipiatae from the solution? 2)At 80oC, what mass of sodium dissolves in 1.0L of water 3.What minimum temperature is required to dissolve 24 g of potassium nitrate in 40 g of water? is...
Monday, November 21, 2011 at 5:44pm by Maame

Chemistry
im almost done with my hw just last six i dont get, i need the molecular, total ionic, and net ionic equations please Aqueous solutions of potassium phosphate and calcium nitrate are mixed .Aqueous solutions of barium chloride and sodium sulfate are mixed. Magnesium is added ...
Thursday, March 4, 2010 at 9:24pm by samantha

Chemistry
If you are a mixture of ammonium chloride, barium sulphate and sodium chloride how would you produce a pure dry sample of each of those chemicals for the mixture.
Wednesday, February 24, 2010 at 8:23pm by Jose-Ann

Chemistry
250mL/100mL=1.5 36g * 2.5=90g 90 grams KCl (potassium chloride) will be needed to make a saturated solution in 250 mL of water at 40 degrees C.
Wednesday, May 26, 2010 at 6:18pm by eloise

chemistry
A sample of the primary standard, Potassium hydrogen phthalate, weighing 0.3589g requires 14.96mL of NaOH solution for neutralization. calculate the molarity of the NaOH solution.
Wednesday, October 21, 2009 at 10:52pm by Reen

chemistry
write a balanced equation for the reaction that occurs when an aquesous solution of iron(II) chloride is mixed with an aqueous solution of potassium hydroxide
Monday, March 24, 2008 at 9:27pm by natash

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Saturday, February 22, 2014 at 2:46pm by Roro

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Sunday, February 23, 2014 at 4:30am by Roro

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Sunday, February 23, 2014 at 8:25am by Roro

Chemistry
A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)
Sunday, February 23, 2014 at 12:11pm by Roro

ap bio
10 . Which one of the following statements is NOT true about the resting potential? A. The neuron's plasma membrane is much more permeable to potassium than to sodium. B. The concentration of sodium is much higher inside the cell than outside. C. The sodium-potassium pump ...
Thursday, November 13, 2008 at 2:49pm by carol

chemistry
Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.
Saturday, June 23, 2012 at 1:03pm by mary

chemistry please help
Calculate the lattice energy of potassium oxide from the following data: Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond energy of oxygen: +498 kJ/mol First ionization energy of potassium: +419 kJ/mol 1st electron affinity of oxygen: -141 kJ/mol 2nd electron affinity ...
Sunday, April 17, 2011 at 11:57am by Joanie

CHEM please!!! help
Calculate the lattice energy of potassium oxide from the following data: Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond energy of oxygen: +498 kJ/mol First ionization energy of potassium: +419 kJ/mol 1st electron affinity of oxygen: -141 kJ/mol 2nd electron affinity...
Tuesday, April 19, 2011 at 10:11am by Joanie

chem
A sample of potassium hydrogen oxalate, KHC204, weighing 0.717 g, was dissolved in water and titrated with 18.47 mL of an NaOH solution. Calculate the molarity of the NaOH solution.
Wednesday, November 21, 2012 at 2:52pm by amanda78

chemistry
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 114 kj of heat?
Sunday, February 15, 2009 at 12:40pm by reese

chemistry/help
can someone please help me balance this equation?: potassium permanganate reacts with iron(II)sulfate and sulfuric acid to produce iron(III)sulfate and manganese(II)sulfate and potassium sulfate and water.
Tuesday, March 13, 2012 at 7:15pm by joseph

chemistry help!
Potassium nitrate has a lattice energy of -163.8 kcal/mol and a heat of hydration of -155.5 kcal/mol. How much potassium nitrate has to dissolve in water to absorb 105 kJ of heat?
Wednesday, September 19, 2012 at 10:29am by student

Chemistry
write out the balanced equation when Iron(II) sulfate, potassium permanganate, and sulfuric acid react to form Iron (III) sulfate, manganese (II) sulfate, Potassium sulfate, and water.
Monday, October 14, 2013 at 8:49pm by Jane

chem
Potassium nitrate has a lattice energy of -163.8 kcal/ mol and a heat of hydration of -155.5 kcal/ mol . How much potassium nitrate has to dissolve in water to absorb 105kj of heat? Answer in kg.
Wednesday, September 19, 2012 at 2:02am by michelle

Chemistry
Which of the following is not suitable for testing the presence of an acid? A) adding aqueous potassium carbonate. B) adding aqueous potassium hydroxide. C) adding Universal Indicator. D) adding zinc powder. Personally, I feel that all of them are suitable.
Sunday, October 13, 2013 at 10:38am by Hao

chemistry
What is the coefficient of oxygen in the following equation for the reaction of potassium (K) with oxygen (O2) to form potassium oxide (K2O? __ K + ___ O2 -> ___ K2O is it 4, 3, 2, or 1?
Monday, April 7, 2008 at 1:29pm by Sarah

chemistry
Potash is composed mainly of potassium carbonate, K2CO3. If 1.000g of potash reacts with sulfuric acid to produce 145 mL of carbon dioxide gas at STP, what is the percentage of potassium carbonate in the marble sample? K2CO3 + H2SO4 ==> K2SO4 + H2O + CO2
Monday, November 28, 2011 at 11:09pm by Monique

Chemistry
Draw a diagram of the Born-Haber cycle for potassium bromide. Include labels (DHf, DHSub, DHVap, DHI.E., DHE.A., DHL.E, etc.) of the different energies involved. Include the equation needed showing how the lattice energy would be calculated (DHL.E,).
Monday, December 3, 2012 at 8:59pm by Jerett

chemistry
10. If the calcium oxide were obtained by the heating of calcium hydroxide, how much hydroxide would be needed to obtain the 15.0 g? 11. If the 15.0 g of calcium oxide in the above problems were allowed to react with water, what amount of calcium hydroxide would be produced? ...
Thursday, December 13, 2012 at 7:19pm by greg

chem
The following equation describes the oxidation of an acidified solution of sodium oxalate (Na2C2O4) by potassium permanganate(KMnO4) 5C2O4 + 2MnO4 + 16H2SO4 --> 10CO2 + 2Mn + 16HSO4 + 8H20 What volume of 0.127M sodium oxalate in sulphuric acid will react with 3.57g of ...
Tuesday, April 7, 2009 at 5:25pm by tomi

chemistry- proofread n help
Li3N i puit Lithium Nitride OK FeS i put ion Sulfide iron(II) sulfide KCI i put Potassium Chloride OK if you intend KCl CoSO4 i put Cobalt Sulfide cobalt(II) sulfate SrBr2 i put Strotium bromide OK NCI3 i put Nitrogen trichlorideOK if you intend this to be NCl3. That is not a ...
Saturday, March 8, 2008 at 2:24pm by DrBob222

Chemistry
A solution of potassium hydroxide is in equilibrium with an undissolved solute at 45 degrees Celsius. What will happen to the mass of the potassium hydroxide if the temperature is raised to 50 degrees Celsius? (Given that heat of solution is -57.6kJ/mol)Please explain as well.
Friday, December 14, 2012 at 12:59am by Dayton

chem
a 6.54 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. this mixture then reacts with barium chloride to for 3.50 g of silver chloride. calculate the percent by mass of silver nitrate in the first mixture
Tuesday, December 14, 2010 at 4:39pm by christine

Chemistry
How do these react? Some may have no reaction. a. aqueous chromium(III) nitrate plus magnesium metal b. aqueous lithium sulfate plus aqueous barium chloride c. solid lead metal plus aqueous potassium chloride d. aqueous lithium fluoride with aqueous ammonium phosphate
Monday, April 4, 2011 at 10:49pm by Blaire

Chemistry
A sample of a mixture containing only sodium chloride (NaCl) and potassium chloride (KCl) has a total mass of 4.000g. When this sample is dissolved in water and excess silver nitrate is added a white precipitate (AgCl) forms. After filtration and drying, this precipitate had a...
Friday, February 2, 2007 at 10:25pm by Steve

Health/SCI302
1. Compare and contrast how different electrolytes—sodium, potassium, and chloride—function in the body. 2. What effects might alcohol and caffeine have on hydration levels in the body?
Sunday, May 2, 2010 at 11:40am by Toni

biochemistry
if 4 volumes of 0.1M monobasic potassium phosphate, KH2PO4, are mixed with 2 volume of 0.1 M dibasic sodium phosphate, Na2HPO4, what will be the pH of the mixture? What if 4 volumes of 0.1 M KH2PO4 are mixed with 8 volumes of 0.1 M ethanolamine base(pka=9.44) what will be pH ...
Friday, January 21, 2011 at 7:32pm by dIrk

chemistry
a large 1.5 x 10^6liter tank contains water polluted with lead (II) nitrate at a molarity concentraion of 2.5 x 10^-6 M to the tank, you add 59.7 liters of 0.075 M potasium chloride solution. did you add enough potassium chloride to remove all the lead(II) ions out of the ...
Sunday, February 26, 2012 at 8:46pm by tom

Chemistry
A mixture contains only CuCl2 and FeCl3. A 0.7391 g sample of the mixture is completely dissolved in water and treated with silver nitrate. if 86.91 mL of 0.1463 M silver nitrate soultion is needed to precipitate all the chloride as silver chloride, what is the weight percent ...
Sunday, October 2, 2011 at 12:04pm by Jessica

chemistry
in 1807 the English chemist Humphrey Davy passed an electric current through molten potassium hydroxide and isolated a bright, shiny reactive substance. He claimed the discovery of a new element, which he names potassium. In those days, before the advent of modern instruments...
Saturday, May 21, 2011 at 3:40pm by kimberly

chemistry/HELP PLLEASE
can someone please help me balance this equation?: potassium permanganate reacts with iron(II)sulfate and sulfuric acid to produce iron(II)sulfate and manganese(II)sulfate and potassium sulfate and water
Friday, February 18, 2011 at 9:24am by joy

Chemistry
write and balance the equation. then figure the moles of potassium carbonate. Look at the mole ratio of KCl to potassium carbonate. Multipy the originalmoles of postassium carbonate by that ratio, and you have the moles of KCl. Convert that to grams.
Sunday, October 17, 2010 at 11:11am by bobpursley

chemistry
can someone please help me balance this equation?: potassium permanganate reacts with iron(II)sulfate and sulfuric acid to produce iron(II)sulfate and manganese(II)sulfate and potassium sulfate and water
Friday, February 18, 2011 at 2:07am by joy

ap biology
10 . Which one of the following statements is NOT true about the resting potential? (28.3) [Hint] A. The neuron's plasma membrane is much more permeable to potassium than to sodium. B. The concentration of sodium is much higher inside the cell than outside. C. The sodium-...
Thursday, November 6, 2008 at 4:37pm by carol

chemistry
What volume of 0.100 M NaOH is needed to make 100.0 mL of a buffer solution with a pH of 6.00 if one starts with 50.0 mL of 0.100 M potassium hydrogen phthalate? The Ka2 for potassium hydrogen phthalate is 3.1 × 10-6.
Saturday, April 6, 2013 at 10:26pm by rodger

phys
Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei, which have a half-life of 1.26 billion years. What fraction of all the potassium nuclei in your body will undergo radioactive decay in the next 1.04-...
Thursday, June 6, 2013 at 1:20am by Anonymous

chemistry
In which solution (acidic, basic, neutral water, or doesn't matter) is potassium bromide most soluble? a. acidic b. basic c. neutral d. doesn't matter
Sunday, October 10, 2010 at 7:17pm by Nick

science
Will you please check a few more? Physical change, chemical change or both kinds of change? 1. Sodium hydroxide dissolves in water (both) 2. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. A pellet of sodium is sliced in two (...
Wednesday, September 12, 2012 at 9:58pm by Reed

solubility graph
What termprature is necessaty in order to dissolve twice as much of these solids in 100 cm3 of water as can be dissolved at 20gC a. sosium nitrate b. potassium nitrate c. sodium chloride
Monday, November 10, 2008 at 5:04pm by tony

organic chemistry
1if you open the tert-butyl chloride and tert-butyl bromide to the air for few hours? What happened to the ratio of the halide mixture during this time? (2-methyl-2-propanol reaction )
Tuesday, October 8, 2013 at 8:31pm by jenny

Chemistry
Here is the site at webelements that gives the properties of the element K. http://www.webelements.com/potassium/
Saturday, November 29, 2008 at 2:00pm by DrBob222

A/P Chem
A student wants to make a 5.00% solution of potassium chloride using .0377 g of the substance.What mass of water will be needed to make the solution?
Sunday, July 24, 2011 at 8:17pm by Autum

chemistry
An aqueous solution is 0.273m kcl. What is the molar concentration of potassium chloride, kcl? The density of the solution is 1.011 x 1 1000 g/L Who helps me
Sunday, December 16, 2012 at 12:06am by Fai

Chemistry
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
Sunday, June 17, 2012 at 7:31pm by B

chem (science)
Which of the following pairs of elements are likely to form ionic compounds: A) helium and oxygen B) magnesium and chlorine C) chlorine and bromine D) potassium and sulfur E) sodium and potassium F) nitrogen and oxygen I believe the answer is d and f Would appreciate a ...
Sunday, September 18, 2011 at 1:41pm by jake

chemistry
write a balanced equation for the reaction that occurs when an aqueous solution of iron(II) chloride is mixed with an aqueous solution o potassium hydroxide.
Thursday, October 16, 2008 at 2:15am by Lili

Chemistry
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
Sunday, September 27, 2009 at 10:37pm by Telicia

Chemistry
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen: 4KNO3(s)--> 2K2O(s) + 2N2(g) + 5O2(g) To produce 56.6 kg of oxygen, how many (a) moles of KNO3 must be heated? (b) Grams of KNO3 must must heated?
Tuesday, September 29, 2009 at 7:12pm by Telicia

Biology
Plants require the right balance of macro and micro nutrients (macro=large amounts, micro= trace amounts) to assist them in growth, this balance is specific to different plant species. Potassium is an example of a macronutrients. One use of potassium is that it is the nutrient...
Tuesday, September 11, 2012 at 6:10am by lucy

Chemistry
The values of Ksp for silver bromide, AgBr is 7.7x10^-13, and silver chloride, AgCl is 1.6x10^-10. A solution containing a mixture of 2.0x10^-2 M Br^- and 2.0x10^-2 M Cl^- is a candidate for separation using selective precipitation. Solid AgNO3 is added without changing the ...
Tuesday, July 27, 2010 at 11:55pm by Sam

Chemistry
It says 8. In a similar experiment Mary Moreorlesss was to determine the loss of weight when a crucible of potassium chlorate was heated to drive off the oxygen. After finishing the experiment she concluded the potassium chlorate contained 24.0% oxygen. Why did miraculous(...
Thursday, February 6, 2014 at 10:25pm by Samantha

Organic chemistry
When synthesizing n-butyl bromide by allowing n-butyl alcohol to rect with sodium bromide and sulfuric acid what are the formulas for the salts that may precip. when the reaction mixture is cooled?
Saturday, March 20, 2010 at 4:16pm by Tammy

Chemistry
Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4– + C2O42– Mn2+ + CO2 MnO4– + Fe2+ Mn2+ + Fe3+ ? The potassium ion is a spectator ion. You have written ionic equations (but omitted the arrows to separate the reactants from the ...
Sunday, April 29, 2007 at 11:45pm by Emi

AP CHEMISTRY
Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. A) bis(bipyridyl)cadmium(II) chloride B)potassium tetrabromo(ortho-phenanthroline)- cobaltate(III)
Saturday, February 18, 2012 at 1:15pm by MARY

AP CHEMISTRY
Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. A) bis(bipyridyl)cadmium(II) chloride B) potassium tetrabromo(ortho-phenanthroline)- cobaltate(III)
Thursday, February 23, 2012 at 8:07pm by JIM

AP CHEMISTRY
Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. 1) bis(bipyridyl)cadmium(II) chloride 2)potassium tetrabromo(ortho-phenanthroline)- cobaltate(III)
Saturday, February 25, 2012 at 12:23pm by DAN

Chemistry
Predict the most likely redox reaction and use the spontaneity rule to predict whether the reaction will occur spontaneously. 1. An aqueous solution of potassium permanganate was reacted with an acidic solution of sodium bromide and an orange-born substance was formed. Can ...
Wednesday, February 27, 2008 at 8:15pm by Alex

chemistry
A crucible containing potassium chlorate has a mass is 24.426 g. The crucible is heated according to the lab procedure for this week's experiment and is found to weigh 23.642 g. Write an equation for the reaction and, assuming that all the chlorate decomposed, calculate the ...
Monday, October 3, 2011 at 10:34am by Mohammed

chemistry
A crucible containing potassium chlorate has a mass is 24.426 g. The crucible is heated according to the lab procedure for this week's experiment and is found to weigh 23.202 g. Write an equation for the reaction and, assuming that all the chlorate decomposed, calculate the ...
Wednesday, February 13, 2013 at 8:45pm by memo

chemistry
overall balanced reaction: 14H+ + C2O7^2- + 6Fe^2+ -> 2Cr^3+ + 7H2O + 6Fe^3+ .5021g of impure sample containing potassium dichromate was analyzed by titrating a standard iron (II) sulfate solution. If 6.74 mL of 0.2312 N of iron (II) sulfate was required to reach the ...
Monday, October 26, 2009 at 11:30am by Anonymous

chemistry
treatment of a 0.400g sample of impure potassium chloride with an excess of AgNO3 resulted in the formation of 0.733g of AgCl. calculate the percentage of KCl in the sample. show balanced equations in support of your answer
Wednesday, August 15, 2012 at 4:14pm by Andrea

science (chem)
From The Merck Index--- methylene chloride density = 1.33 g/cc n-butyl chloride = 0.89 g/cc n-butyl bromide = 1.27 g/cc so I expect you are reading it. Were they not listed. Go to the index FIRST (don't try to look them up by name in the alphabetical listing because they may ...
Sunday, September 9, 2007 at 2:39pm by DrBob222

chemistry
Heating KClO3 produces oxygen and potassium chloride. KClO3 + heat ==> KCl + O2 The balanced equation is: 2KClO3 ==> 2KCl + 3O2.
Sunday, November 23, 2008 at 5:02pm by DrBob222

chem090
100.0 g of Potassium Phosphate reacts with 100.0 g of Barium Chloride. Which molecule is completely used up by the reaction? How many grams of the other molecule are left over?
Tuesday, April 8, 2014 at 4:59pm by Jenny

chemistry
This equation decribes oxidation of acidified solution of sodium oxalate(Na2C2O4) by potassium permanganate(KMnO4): 5 C2O4^2- + 2Mn04^- + 16H2SO4 to produce 10Co2 + 2Mn^2- + 16HSO4^- + 8H2O. what volume of 0.127M sodium oxalate in sulphuric acid will react with 3.57g of ...
Thursday, February 6, 2014 at 1:00am by Temmick

Chemistry
One mole of each of the following compounds is added to water in separate flasks to make 1.0 L of solution. Which solution has the largest total ion concentration? a. aluminum hydroxide b. silver chloride c. sodium chloride d. calcium carbonate e. potassium phosphate I just ...
Monday, May 9, 2011 at 12:01am by Sam

Psychology
I have to make a diagram of a neuron and label the given parts. I have it all finished except for sodium and potassium. I asked my teacher and he said they go in the action potential. I am not sure which one goes where though. I think the sodium is outside and the potassium is...
Monday, September 29, 2008 at 8:18pm by Marie

AP CHEM
Please help me with thses AP CHEM homework problems and show the steps to how to find the solutions: Solid Liquid Titrations: Determine the concentration of the indicated liquid unknown given the mass of a solid standard and the buret data for the titration. #35) What is the ...
Thursday, July 31, 2008 at 10:50am by shylo

Math in Science
A rock containing a newly discovered fossil is found to contain 5 mg of an unstable form of potassium and 5 mg of the stable element formed from its decay. If the half-life of the unstable form of potassium is 1.3 billion years, how old is the rock? What can you infer about ...
Thursday, November 7, 2013 at 5:25pm by Janey

chemistry
I don't know how to explain or if Ive got my homework answer correct. The question is: A patient on dialysis has a high level of urea, a high level of sodium and a low level of potassium in the blood. Why is the dialyzing solution prepared with a high level of potassium but no...
Thursday, April 14, 2011 at 8:27am by Connie

Chemistry
How many liters of oxygen gas at 153 degrees celsius and 0.820 atm can be produced by the decomposition of 22.4 g of solid KClO3? (The other decomposition product is solid potassium chloride)
Friday, January 29, 2010 at 2:14pm by Fred

ion concentration
Which of the following is responsible for maintaining the difference in ion concentration across the membrane of a nerve cell? here are choices the sodium-potassium pump the action potential the depolarization of the membrane the ion channels in the membrane I think it is the ...
Sunday, November 26, 2006 at 12:54pm by alyssa

Physics
W potassium eV 0 ( ) = 2.25 , W caesium eV 0 ( ) = 2.14 , 7 1 5650 10 m − λ = × , 7 2 5180 10 m − λ = × 34 h J s 6.63 10 . − = × , 8 c m s = × 3 10 / W potassium eV 0 ( ) = 2.25 19 2.25 1.6 10 J − = × × 19 3.6 10 J − = × W caesium eV 0...
Friday, March 18, 2011 at 5:15pm by Riko

Chemistry
Gunpowder is a mixture of potassium nitrate, sulfur and carbon in the proportion by mass of 6:1:1 (KNO3:S:C). A typical rifle shell contains 3.0g of gunpowder. How many moles of each component are there in our sample of gunpowder?
Tuesday, October 20, 2009 at 4:02pm by L

chm
gunpowder is a mixture of potassium nitrate , sulfur and carbon in th proportion (by mass) of 6:1:1 (KNO3;S:C). A typical riflr shell contains 3.2 gunpowder. How many moles of each compnent are there in our sample gunpowder?
Tuesday, October 27, 2009 at 12:45am by Brittany

chem--please help me!!
25.00 mL sample of this sulfuric acid solution. You then titrate it with a 0.1322 M potassium hydroxide solution. A volume of 41.22 mL of potassium hydroxide was required to complete the titration. What is the concentration of this unknown sulfuric acid solution?
Saturday, October 30, 2010 at 2:29pm by Anonymous

Chemistry- Mass Question
What is the mass of 0.005 moles of camphor, urea, and potassium ethanoate? Thanks in advance. You need to look up the formula of camphor, urea, and potassium ethanoate. Then g = 0.005 mols x molar mass of each.
Tuesday, February 6, 2007 at 7:32pm by Aubrey

chemistry /help please
can someone please help me balance this equation?: potassium permanganate reacts with iron(II)sulfate and sulfuric acid to produce iron(II)sulfate and manganese(II)sulfate and potassium sulfate and water
Friday, February 18, 2011 at 8:46am by joy

chemistry
Rb2Se Phosphate is PO3-3 and Potassium is K+1 so what is the formula for potassium phosphate? We will be happy to critique your thinking.
Thursday, July 2, 2009 at 5:09pm by bobpursley

chemistry
Write the equation for the reaction, if any, that occurs when each of the following experiments is performed under standard conditions. a) crystals of iodine are added to an aqueous solution of potassium bromide. b) liquid bromine is added to an aqueous solution of sodium ...
Sunday, May 13, 2007 at 5:11pm by Krystal

Statistics
I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for normal heart, digestive, ...
Wednesday, August 1, 2007 at 4:51pm by Kasey

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