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October 23, 2014

Search: Na2S2O3

Number of results: 107

Chemistry*
The following equation is given: S2O3 -2 + 2H +1 ---> S + SO2 + H2O [HCl] = 2 mol/L [Na2S2O3]= 0.3 mol/L what is the concentration (mol/L) of H+ if you were to add: a) 20 mL of HCL with 5 mL Na2S2O3 & with 5 mL H2O b) 15 mL of HCl with 5 mL Na2S2O3 & 10 mL H2O c) 7.50 mL of...
November 4, 2010 by Stephanies

Chemistry
What is the full net ionic equation for each reaction? do they form a precipitate or have a color change? CuSO4+AgNO3 CuSO4+BaCl2 CuSO4+Cu(NO3)2 CuSO4+Pb(NO3)2 CuSO4+KI CuSO4+Na2S2O3 AgNO3+BaCl2 AgNO3+Cu(NO3)2 AgNO3+Pb(NO3)2 AgNO3+KI AgNO3+Na2S2O3 BaCl2+Cu(NO3)2 BaCl2+Pb(NO3)2...
May 27, 2008 by Joe

Chemistry
What is the full net ionic equation for each reaction? do they form a precipitate or have a color change? CuSO4+AgNO3 CuSO4+BaCl2 CuSO4+Cu(NO3)2 CuSO4+Pb(NO3)2 CuSO4+KI CuSO4+Na2S2O3 AgNO3+BaCl2 AgNO3+Cu(NO3)2 AgNO3+Pb(NO3)2 AgNO3+KI AgNO3+Na2S2O3 BaCl2+Cu(NO3)2 BaCl2+Pb(NO3)2...
May 27, 2008 by Joe

college chem
how many milliliters of 0.200 M Na2S2O3 are needed to provide 0.0388 mol Na2S2O3?
June 2, 2009 by kelly

chemistry
Calculate the mass of solid Na2S2O3•5H2O required to prepare 300. mL of 0.0200 M Na2S2O3
October 1, 2012 by Nicolai

chemistry
Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be determined by a titration with iodine, I2, according to the equation: 2Na2S2O3(aq) + I2(aq) --> Na2S4O6 +2NaI(aq). Calculate the concentration of the ...
March 2, 2014 by Muhammad

chemistry,
in analyzing household bleach. I have a flask that contains 10.00 mL diluted bleach + 0.4g KI + 20 mL distilled water and 20 drops of 2M HCl. To that I titrated 30.60 mL Na2S2O3 and I need to calculate the number of moles of NaOCl reacted. This is what I was thinking.. ...
April 10, 2007 by amy

Chemesitry!
Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be determined by a titration with iodine, I2, according to the equation: 2Na2S2O3(aq) + I2(aq) --> Na2S4O6 +2NaI(aq). Calculate the concentration of the ...
October 5, 2012 by Anonymous

Chemistry
Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check: 0.09600g/(214.0g/mol)=4.486x 10^-4 mol -4.486 mol/0.1L= 44.86 M B. ...
March 6, 2011 by Bryant

Chemistry
2 ml of 1M HCl 0 ml of H2O 3ml of .3M Na2S2O3 How do I find the initial and final concentrations of both HCl and Na2S2O3?
January 7, 2013 by Nicole

AP chem
How do you propose a mechanism for this reaction: 18H(+) + 4S2O3(2-)-->SO3(2-) + 7S + 9H2O where the rate law: rate=k[Na2S2O3] with first order respect to Na2S2O3...
February 18, 2007 by anonymous

Chemistry
For chem we did a kinetics lab based on the rate of reaction of peroxydisulfate ion with iodide ion. I'm supposed to find the amount of S2O3 ^2- consumed for every trial (in moles) If someone could just explain how to do that with the information I currently have, that would ...
February 13, 2014 by Anonymous

Analytical Chemistry
I am trying to find moles of IO3 from Cu(IO3)2 10 ml and standardized sodium thiosulfate (Na2S2O3.5H20) .28 M. My calc is: 0.28 Moles Na2S2O3.5H20 * (2 moles of S2O3/1 mole Na2S2O3.5H20)* (2 moles of (IO3)/1 mole Cu(IO3)2= (1.12/.01 L) but that is why to high for (M) what am I...
October 11, 2010 by Max

chemistry
A drop of starch is added to a mixture of 97.30 ml of 0.1096 M I2 and 97.20 ml of 0.1098 M Na2S2O3. I've already calculated the moles of I2 to be 10.66408 moles and the moles of Na2S2O3 to be 10.67256. Will the solution be blue even if their moles aren't the same?
February 5, 2009 by jean

chemistry
compute volume and/ or weights of reagents to make the following solution. Desired concentration: 40% NaOH + 4% Na2S2O3 Desired quantity: 1500 mL Given: 90% w/w NaOH, pure Na2S2O3 I'm not sure how to do this so any help would be great. Thanks!
September 16, 2007 by Alan

Chemistry
compute volume and/ or weights of reagents to make the following solution. Desired concentration: 40% NaOH + 4% Na2S2O3 Desired quantity: 1500 mL Given: 90% w/w NaOH, pure Na2S2O3 I'm not sure how to do this so any help would be great. Thanks!
September 17, 2007 by Alan

Chemistry
I am so confused with my chemistry lab right now. We were given the following equations to work with: [Equation 1] 2 I^- + H2O2 + 2 H^+ ----> I2 + 2 H2O [Equation 9] 2S2O3^2- + I2 ----> 2I^- +S4O6^2- And During the Experiment we used the following for each reaction: T1...
September 20, 2014 by Bev

Chemistry
Copper(I) Iodide is synthesised by the equation: 2CuSO4.5H2O + 2KI + 2Na2S2O3.5H2O --> 2CuI + K2SO4 + Na2SO4 + Na2S4O6 + 10H2O Would it make a difference if anhydrous CuSO4 and Na2S2O3 are used instead? Why hydrous CuSO4 and Na2S2O3 are used instead?
March 13, 2010 by Alan

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

Science- Chemistry
How do I figure these out? A solution of sodium thiosulfate, Na2S2O3, is 0.1365 M. 29.28 mL of this solution reacts with 39.79 mL of I2 solution. What is the molarity of the I2 solution? 2(Na2S2O3) + I2↔Na2S4O6 + 2(NaI) 16.77 mL of the I2 solution from above is required...
November 8, 2012 by Whitney

chemistry
Volume of Na2S2O3(aq) required? final burette reading trial1= 45.00 trial2= 44.27 trial3= 45.28 initial burette reading trial1= 0.52 trial2= 1.22 trial3= 2.33 volume of Na2S2O3 used in each trial? average of the two volumes agreeing within 0.10mL? can anyone help me with this ...
November 16, 2011 by Yul

CHemistry Please Help..............LAB
Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water. Potassium iodate reacts ...
October 19, 2008 by Sara

Chemistry
I had to perform an experiment for rate of reaction. I have to calculate the concentration of Na2S2O3 in the reaction solutions based on the volume used in each reaction flask and the total volume calculated. There were five flasks used and for all 5 of them 2.50mL of Na2S2O3 ...
February 24, 2012 by Hannah

Chemistry
Hi DrBob, Sorry about that, I wasn't very clear! Can someone please help me complete these calculations for my lab; I am having some trouble. A. Standardization of Na2S2O3 -Mass of KIO3 in 100mL = 0.09600g -Calculate Molarity of KIO3= ? Please check: 0.09600g/(214.0g/mol)=4....
March 6, 2011 by Bryant

Chemistry
Hi, I'm really having trouble this this chemistry problem. I have the answers; however I don't have extensive knowledge about titrations and I'm struggling with working it out. If anyone could suggest how to work this out (or even where to start) that would be great. Thanks! ...
August 26, 2007 by Stein

Chemistry: HELP! PLEASE
a) Addition of Na2S2O3 to I2+I-->I3 in an aqueous layer will turn the solution clear and colourless. Write an equation explaining this observed colour. b) Addition of Na2S2O3 to I2+I-->I3 in an varsol layer will turn the solution pink. Write and equation explaining this ...
March 2, 2014 by Natasha

chemistry
A stock solution's hypochlorite activity was determined as follows: . - 2.00g of liquid sodium hypochlorite (NaOCl) was weighed into a flask and diluted with 50mL deionized water.10mL of 10% sulfuric acid and 10mL of 10% potasssium iodide were added, followed by titration with...
August 4, 2010 by angela

Chemistry
These are what i used. 0.0375M sodium thiosulphate , 2.5% KI .47.2 ml copper sulphate solution. the average volume of Na2S2O3 is 19.25 cm, i have already calculated the number of moles of thiosulphate which is 7.218 * 10-4 moles of Na2S2O3 and also the number of moles of I2 ...
February 26, 2012 by Sarah

chemistry
How many grams of Na2CO3 are required to Na2S2O3
April 4, 2011 by Rickia

chemistry
How many grams of Na2CO3 are required to Na2S2O3
April 4, 2011 by Rickia

Chemistry
How to prepare a 750mL stock solution with a 0.40 M Na2S2O3.
September 25, 2012 by GoodinChem619

Chemistry Lab
So I did a kinetics lab on the rate of reaction of peroxydisulfate ion with iodide ion. Part 1 was the effect of concentration. One of the questions asked is to calculate the amount of thiosulfate consumed in moles. My results for trial 1 were (Times taken for consumption of 1...
February 2, 2014 by Anonymous

phisical sience
what reaction do you get when adding 3 tespoons of Na2S2O3 to 50 ml of boiling water
May 18, 2011 by Siphesihle

college chemistry
How do I name the following compounds; K2S2O8, S2O8{-2}, Na2S2O3 and S2O3{-2}
February 25, 2009 by Steven

Analytical chemistry
What is the reaction & calculation when KIO3 mixed with KI, HCl by titration with Na2S2O3?
July 8, 2011 by Selim

Chemistry
Are the following chemicals light sensitive? 1) Potassium Iodide (KI) 2) Sodium thiosulphate (Na2S2O3)
January 8, 2011 by candy

Chemistry
Hello, I would greatly appreciate some help with the following problem, as I'm not sure how to proceed. I'm trying to find solubility (Ksp) of Cu(IO3)2 from titration experiment. The following equations were provided: Cu(IO3)2 --> Cu^2+ + 2IO3^- Ksp = [Cu^2+][IO3^-]^2 2Cu^2...
July 23, 2014 by Constantine

Chemistry
Calculate the molar solubility of barium thiosulfate in 0.0045 M Na2S2O3(aq). (Hint: Check any simplifying assumptions that you make.)
April 19, 2010 by Chemistry Confused

Chemistry
How many milliliters of 0.230 M Na2S2O3 solution are needed to titrate 2.349 g of I2 according to the equation below? I2(aq)+2S2O3^2-(aq)->S4O6^2-(aq)+2I^1-(aq)
October 6, 2010 by Drew

CHemistry Please Help. DR. BOBB
Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water. Potassium iodate reacts ...
October 19, 2008 by Sara

chemistry
How many grams of I2 are present in a solution if 33.75mL of 0.140M Na2S2O3 solution is needed to titrate the I2solution?
November 18, 2013 by Ellen

Chemistry
When aqueous CuSO4 is added to aqueous Na2S2O3, why is there no reaction?
September 25, 2011 by Hannah

Science
What is the scentific formula for Sodium Thiosulphate? What is the mass of a 30 N rock in the school yard? Sodium thiosulfate is Na2S2O3.
October 10, 2006 by Gina

chemistry
In a measurment 0.1M Kmno4 is used.determine the volume of solution required to react with 0.158M Na2s2o3 required?
March 14, 2013 by Abhishek Bhargav

chemistry
calculate the numbers of moles of sodium thiosulfate (Na2S2O3) and hence the moles of S2O3^2- ions present in the volume of 43mL can someone plz help me?
November 16, 2011 by Yul

chemistry
calculate the numbers of moles of sodium thiosulfate (Na2S2O3) and hence the moles of S2O3^2- ions present in the volume of 43mL someone plz help
November 16, 2011 by myu

Chemistry
How many grams of I2 are present in a solution if 38.55ml of 0.160M Na2S2O3 solution is needed to titrate I2 the solution?
November 19, 2012 by Michi

Chemistry
How many grams of I2 are present in a solution if 39.85mL of 0.160M Na2S2O3 solution is needed to titrate the I2 Solution
March 14, 2014 by Jackie

Chemistry Help Please
Titration of a Sample of Household bleaches: The oxidizing agent in a household bleach is determined by placing 100 mL of distilled water in a 250 mL Erlenmeyer flask and adding 10 mL of the 10% (w/w) KI solution, swirling the contents of the flask to mix the solutions. Add an...
October 22, 2008 by Sara

chemistry
What will happen if 50mL of 0.022M Na2S2O3, 50mL of 0.010M AgNO3, and 50mL of 0.097M KCl are mixed together? For AgCl, ksp=1.8x10^-10 ; for Ag(S2O3)2^3-, Kf= 2.9 x 10^13.
April 22, 2014 by Anonymous

chemistry
Please Help!what will happen if 50mL of 0.022M Na2S2O3, 50mL of 0.010M AgNO3 and 50mL of 0.097m KCl are mixed together? for AgCl, ksp=1.8x10^-10, for Ag(S2O3)2^3-, Kf =2.9x10^13. !
April 23, 2014 by leslie

chemistry
A solution of sodium thiosulfate, Na2S2O3, is 0.4206 M. 28.94 mL of this solution reacts with 5.89 mL of I2 solution. What is the molarity of the I2 solution?
October 14, 2014 by Ana

Chemistry
I had to perform an experiment for rate of reaction. The point of the experiment was to show how changes in reactant concentration, temperature, and catalyst presence can affect the rate of a reaction. The reaction that we studied was H2O2 + 2I^- + 2H^+ -> I2 + 2H2O We had...
February 26, 2012 by Hannah

Chemistry
A solution was prepared by adding 15mL of 0.129 M KI, 5mL of 0.1 M Na2S2O3, 1mL of starch solution, and 15mL of 0.125 M (NH4)2S2O8. Calculate the concentration of (M) of I in the final mixture before the chemical reaction.
October 3, 2008 by Brian

General Chem
What do you call a solution that is maid by mixing solid Na2S2O3 5H20 with NaOH? Also, what is the complete balanced equation for mixing the above solution with an aqueous solution of NaClO? Thanks anyone!
June 22, 2011 by Mark

Chemisry
The amount of I3–(aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32–(aq) (thiosulfate ion). The determination is based on the net ionic equation Given that it requires 32.9 mL of 0.330 M Na2S2O3(aq) to titrate a 30.0-mL ...
October 1, 2013 by DeJanee

chemistry
Suppose a student diluted and titrated a bleach unknown. A single titration was performed which required 14.42 mL of 0.100 M Na2S2O3. The density of the original, undiluted bleach unknown was 1.042 g/mL. calculate the number of moles of ClO- in the sample titrated.
October 27, 2013 by Morgan

Chemistry
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.40 L of 0.425 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion. Ag+(aq) + 2 S2O32-(aq)--> Ag(...
March 17, 2013 by Howard

Chemistry
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.40 L of 0.425 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion. Ag+(aq) + 2 S2O32-(aq)--> Ag(...
March 17, 2013 by Howard

Chemistry
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.40 L of 0.425 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion. Ag+(aq) + 2 S2O32-(aq)--> Ag(...
March 17, 2013 by Howard

Chemistry
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.40 L of 0.425 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion. Ag+(aq) + 2 S2O32-(aq)--> Ag(...
March 18, 2013 by Howard

Chemistry
you are given the equation S2O3 + 2H --> S + SO2 + H2O you mix 25 ml of HCl with a concentration of 2 mol/L with 5 mL of Na2S2O3 with a concentration of 0.3 mol/L. what is the concentration of S2O3 and H?
October 14, 2010 by Samantha

Chemistry
Solutions of sodium thiosulfate are used to dissolve unexposed AgBr (Ksp = 5.0 10-13) in the developing process for black-and-white film. What mass of AgBr can dissolve in 1.40 L of 0.425 M Na2S2O3? Ag+ reacts with S2O32- to form a complex ion. Ag+(aq) + 2 S2O32-(aq)--> Ag(...
March 17, 2013 by Howard

Chemistry: please double check...
Please double check one last time have to hand it in tomorrow.Thank-You in Advance. This was the lab experiment: ------------------------------------------- A. Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “...
October 27, 2008 by Saira

DrBobb222 : Chemistry HElp...Please Check
Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water. Potassium iodate reacts ...
October 21, 2008 by Sara

Chemistry
In the reaction between H2O2 and I-, 15 mL of 0.30M KI, 65. mL of 0.10M H2O2 and 19 mL of 0.020M Na2S2O3 were mixed in a flask containing starch and buffer and the total volume was made up to 500mL with distilled water. The solution turned blue (indicating the presence of I2...
March 22, 2011 by Nikita

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
October 4, 2014 by Louise

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
October 4, 2014 by Louise

Chemistry
My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the concentration of I^-1 when I...
October 4, 2014 by Louise

Analytical chemistry
A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O required 34.5 ml of 0.0409 M ...
July 30, 2013 by Gloria

Chemisty
If ten drops of 0.3 M HCl are mixed with ten drops of 0.3 M Na2S2O3, what will be the concentration of each chemical in the mixture? Please help, i am pretty sure that the concentration should be 0.3 M but i am not sure if i am supposed to do somthing with the ten drops. Thank...
January 7, 2009 by Nancy

chemistry
You mix together in the proper manner the following VOLUMES: 0.0100 M Potassium iodide...9.2 mL 0.0010 M Sodium thiosulfate...6.5 mL Distilled water...16.8 mL 0.0400 M Potassium Bromate...13.9 mL 0.100 M Hydrochloric acid...6.1 mL Using the rate constant and rate equation ...
March 2, 2013 by Cassie

Chemistry
A 2.304 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.500 grams of KI and 50.00 mL of a 0.00912 M KIO3 solution. The excess I3– was titrated with 50.00 mL ...
April 16, 2013 by Jessica

chemistry
A 1.147 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.690 grams of KI and 50.00 mL of a 0.00821 M KIO3 solution. The excess I3– was titrated with 50.00 mL ...
April 17, 2013 by Lana

chemistry
A 1.857 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.540 grams of KI and 50.00 mL of a 0.00912 M KIO3 solution. The excess I3– was titrated with 50.00 mL ...
May 2, 2013 by Sparkle

Chemistry
A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic solution? Assume the ...
October 12, 2008 by Saira

CHEMISTRY (PLEASE HELP)
My question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 7-11 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1. The volume of ...
July 22, 2014 by Summer

Chemistry
The following is given: 20 ml of HCl (2.0 M) added with 5 ml of Na2S2O3 (0.3 M) with 5 ml of H2O S2O3^-2(aq) + 2H^+1 (aq) --> S (s) + SO2 (g) + H2O (l) Calculate the following: a) Reaction rate when 30 mg of sulphur is formed (in 30 ml of solution) after 55 seconds. b) Rate...
October 20, 2010 by Stephanie

Chemistryy....PLEASE HELPP HAVE MIDTERMMM
A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic solution? Assume the ...
October 12, 2008 by Sara

chemistry
in an experiment 5.00ml of 0.1440 mol L^1- aqueos KIO3 was reacted with an excess of aqueous iodide and the molecular iodine I2, Formed was titrated against 0.1000mol L^1- aqueous S2O3^2- the equation for the titration reaction is: I2(aq)+ 2 S2O3^2-(aq)---->S4O6^2-(aq)+ 2I...
November 16, 2011 by Yulieth

Chem
The following results were obtained when a sample of pineapple juice was analyzed to determine its vitamin C content. A 19.8 mL sample of pineapple juice was placed in a flask with 20 ml of 0.5 M H2SO4, 1.0 g of potassium iodide, KI, and 25.00 mL of 0.01988 M potassium iodate...
May 5, 2014 by Anonymous

DrBob222 : Chemistry HElp...Please Check
Sorry its not letting me post the entire thing in the other thread .000146612 mols KIO3 x (3 mols I2/1 mol KIO3) x (2 mols S2O3^-2/1 mol I2) mols = .000887972 mols S203^2- Then M S2O3^-2 = .000887972 mols/0.02715 L.M = 0.032400 Therefore the Molar mass of Na2S2O3 is 0.032400
October 21, 2008 by Sara

Chemistry
A 10.0 mL volvume of Ultra Bleach is diluted in a volumetric flask. A 25.0 ml sample of this solution is analyzed accordign to the procedure in this experiment. Given that 33.75 mL of 0.135 M Na2S2O3 are needed to reach the stochiometric point, answer the following. a. How ...
January 24, 2012 by Ashley

CHEMISTRY (IODINE VALUE-continuation)
y question is about Determination of Iodine Value in Fats & Oils experiment. I can't seem to get the right IV for coconut oil (Iv = 7-11 range). I followed the procedure used by American Oil Chemists Society, but still I'm getting an IV value of around 1. The volume of titrant...
July 28, 2014 by Summer

Chemistry
Calculate the concentrations of S2O8 2-, I-, S2O32 2- in moles per litre of reaction mixture given the following: 20mL of 0.1 M (NH4)2S2O8 added to: 20mL of 0.2M KI 10mL of 0.01M Na2S2O3 5mL 0.2% starch Also, calculate -(delta)S2O8 2- that is, how much S2O8 2- is used up (...
January 24, 2011 by Rachel

Chemistry
Sulfite (SO3^2-) in wine was measured by the following procedure: 50.0ml of wine were added 5.00ml of solution containing (0.8043 g KIO3 + 5 g KI)/100ml. Acidification with 1.0ml of 6.0 M H2SO4 quantitatively converted IO3^- into I3^-. I3^- reacted with sulfite to generate ...
October 24, 2011 by Ken

chemistry
The balanced equation doesnt seem to help because the thiosulfate is not in the equation, I think it is preventing the reaction from going backwards. THe equation is: 2iodide ion + hydrogen peroxide + 2 H3O --> elemental iodide + 4 H2O within the reaction there is also ...
February 5, 2007 by jacob

Chemi
Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed silver bromide is removed by treating the film with sodium thiosulfate. Soluble sodium silver thiosulfate (Na3Ag(S2O3)2) is...
February 19, 2011 by Kyubei

Chemisty
Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed silver bromide is removed by treating the film with sodium thiosulfate. Soluble sodium silver thiosulfate (Na3Ag(S2O3)2) is...
February 26, 2012 by Denisha

chem plzzz help
okay so im doing pre lab questions on reaction rates I have a chart labeled effects of varying concentration in reaction #1 flask A contains 7.50mL of .200 M KI , none of .20M KCI, 5.00 mL of .0050 M S2O3^2-, 1 drop of starch. Flask B contains 7.5mL of .100M S2O8^2- It says ...
February 15, 2009 by Anna

Chemistry
Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
January 22, 2011 by Rachel

Science
Hello. I have this question for my class. We were to mix Na2S2O3 to a a test-tube with Varsol layer on top and an Aqueous layer (of I2/KI) on the bottom. I observed a lighter colour change in both layers. How would I express that as a chemical equation? Also, I added saturated...
March 9, 2014 by Karan

Chemistry
S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y ƒ´ [S2O82ƒ{] Rate = ƒ{ƒn ------------- ƒ´ƒnt Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M K2S2O8 Used 2ml of each ...
March 8, 2011 by Jude

chemistry
Would the following procedural errors result in an incorrectly high or low calculated percent NaOCl in commercial bleach solution? A student failed to allow the volumetric pipet to drain completely when transferring the diluted bleaching solution to the Erlenmeyer flask. I get...
April 1, 2013 by Brooke

chemistry
Would the following procedural errors result in an incorrectly high or low calculated percent NaOCl in commercial bleach solution? A student failed to allow the volumetric pipet to drain completely when transferring the diluted bleaching solution to the Erlenmeyer flask. I get...
April 2, 2013 by Brooke

Chemistry
Reposting since it wasnt clear in the previous post S2O82-(aq) + 2I-(aq) ----------> 2SO42-(aq) + I2(aq) (I) Rate = k [S2O82-]x [I-]y Rate1 = k [S2O82-]x [I-]y Experiment data Experiment: 0.20M NaI,0.20M NaCl, 0.010M Na2S2O3,2% Starch,0.20M K2SO4, 0.20 M K2S2O8 Used 2ml = ...
March 8, 2011 by Jude

Chemistry - Balancing Equations
Balance the following: Ca(OH) + H2SO4 -----> CaSO4 + H2O Na2S2O3 + I2 -----> 2NaI + Na2S4O6 ZnCl + Na2S -----> ZnS + NaCl SnCl4 + H2O ----> SiO2 + 4HCl I figured out the 2nd and 4th one to be: 2Na2S2O3 + I2 -----> 2NaI + Na2S4O6 SnCl4 + 2H2O -----> SiO2 + ...
April 19, 2010 by Akira

Chemistry
Given the rate equation... RATE = ([ Na2S2O3]/time) = k [I-]a [BrO3-]b [HCl]c 1A) You mix together in the proper manner the following: 10.0 mL of .0100 M Potassium Iodide 10.0 mL of .00100 M Sodium thiosulfate 10.0 mL of water 10.0 mL of .0400 M Potassium Bromate 10.0 mL of ....
March 1, 2013 by Cassie

Chemistry
Given the rate equation... RATE = ([ Na2S2O3]/time) = k [I-]a [BrO3-]b [HCl]c 1A) You mix together in the proper manner the following: 10.0 mL of .0100 M Potassium Iodide 10.0 mL of .00100 M Sodium thiosulfate 10.0 mL of water 10.0 mL of .0400 M Potassium Bromate 10.0 mL of ....
March 2, 2013 by Cassie

Please HElp CHemistry MIDTERM
A 2.00 ml sample of an aqueous solution of hydrogen peroxide, H2O2 (aq) is treated with an excess of Kl (aq). The liberated I2 requires 12.40 mL of 0.1025 M Na2S2O3, for its titration. Is the H2O2 up to the full strength (3% H2O2 by mass) as an antiseptic solution? Assume the ...
October 15, 2008 by Sara

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