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April 19, 2015

Search: diluted pH

Number of results: 746

Chemistry
A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 2. Calculate the % concentration of this solution. 3. Calculate the ...
February 1, 2011 by Paul

biochemistry
You have purifiedLDH using affinity chromatography. Using the bradford assay you determined the total protein concentration of the column fraction to be 10 mg/ml in a final volume of 2.4 ml. You diluted some of your column fraction to 1 mg/ml using SDS Page sample loading ...
December 9, 2013 by lacy

chemistry
You have purifiedLDH using affinity chromatography. Using the bradford assay you determined the total protein concentration of the column fraction to be 10 mg/ml in a final volume of 2.4 ml. You diluted some of your column fraction to 1 mg/ml using SDS Page sample loading ...
December 9, 2013 by lacy

Chemistry
A buffer solution is made as followed: i)adding 13.50mL of 0.200mol/L sodium hydroxide to 50.00mL of 0.100mol/L propanoic acid. ii)diluting the resulted buffer into a total volume of 100.00mL Using IRE-C tables (if possible) calculate: a)The pH of the buffer -before the ...
April 26, 2010 by Sara

College Gen.Chemistry
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and used de-...
March 25, 2014 by Anonymous

Chemistry - Science (Dr. Bob222)
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and used de-...
March 25, 2014 by Anonymous

CHEMISTRY HELP!
(1) A beaker with 165 mL of an acetic acid buffer with a pH of 5.00 is sitting on a bench top. The total molarity of the acid and conjugate base in the buffer is 0.100M. A student adds 7.20mL of a 0.320M HCl solution to the beaker. How much will the pH change? The pka of ...
July 13, 2009 by Ashley

Chemistry
What is the pH of the solution created by combining 2.50 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? I believe if my calculations are correct the answer is 1.28 however i do not know how to answer this question because it has a weak acid instead of a strong ...
July 8, 2007 by Jared

Chemistry - please help
Please help to determine the (%w/w) benzoyl peroxide (C14H20O4) in a sample. Procedure: 2.500g of sample was dissolved in 75ml dimethylformamide and diluted to 100.0ml with the same solvent. (Solution T). To 5.0ml of Solution T, 20ml of acetone and 3ml of a 500g/l solution of ...
August 3, 2010 by angela

Biology help please
1.Many freshwater invertebrates eliminate ammonia by: A. Converting it to uric acid and eliminating it with solid wastes. B. simple diffusion across the gill membranes. C. converting it to urea and eliminating it in their urine. D. simple diffusion across the skin.****** 2. ...
May 9, 2014 by Cassie

Biology help please
1.Many freshwater invertebrates eliminate ammonia by: A. Converting it to uric acid and eliminating it with solid wastes. B. simple diffusion across the gill membranes. C. converting it to urea and eliminating it in their urine. D. simple diffusion across the skin.****** 2. ...
May 8, 2014 by Cassie

math
I have some of the answers to this project but I need help with the last couple of answers. Your next project will involve painting the walls and ceiling of your room. First find the surface area of each wall and the ceiling in square feet. NOTE: you need to CLEARLY identify ...
October 22, 2009 by justme

chemistry
I'm trying to figure out what went wrong during my freshman chem lab. We were figuring out the enthalpy of formation of MgO(s). MgO(s) + 2H+(aq) -> Mg2+(aq) + H2O(l) dHrxn = -334.83kJ/mol Mg(s) + 2H+(aq) -> Mg2+(aq) + H2(g) dHxrn = -1105kJ/mol H2(g)+ 1/2O2(g) -> H2O(l...
April 5, 2013 by Louie

Biology help please
1.Many freshwater invertebrates eliminate ammonia by: A. Converting it to uric acid and eliminating it with solid wastes. B. simple diffusion across the gill membranes. C. converting it to urea and eliminating it in their urine. D. simple diffusion across the skin.****** 2. ...
May 9, 2014 by Cassie

Intermediate Accounting
Information relating to the capital structure of Parke Corporation is as follows: ` December 31 2008 2009 Outstanding shares of: Common stock 90,000 90,000 Preferred stock, convertible into 30,000 shares of common 30,000 30,000 10% convertible bonds, convertible into 20,000 ...
December 11, 2010 by cyndi

Chemistry 12
15. The concentration of hydroxide ions in a solution of nitric acid 0.2 M is: a. 2 x 10-14 M b. 5 x 10-14 M c. 5 x 10-7 M d. 2 x 10-1 M 16. Aqueous solutions of strong acids and strong bases: a. are good electricity conductors b. make litmus paper become red c. have a pH of 7...
December 3, 2012 by Need Help

Organic Chemistry
A 0.160 M solution of an enantiomerically pure chiral compound D has an observed rotation of 0.20 in a 1-dm sample container. The molar mass of the compound is 128.0 g/mol. (a) What is the specific rotation of D? (b) What is the observed rotation if this solution is mixed ...
September 29, 2014 by Trish

Chemistry- Drbob-help
I have placed the answer I got please help. A student makes a solution by dissolving 55.8 grams of potassium hydroxide in 875.0 grams of water. The resulting solution has a density of 1.07 grams per milliliter. 1. What is the volume of this solution? 870mL 2. Calculate the % ...
February 9, 2011 by Paul

chemistry
To what volume should you dilute 131 mL of an 8.20 M CuCl2 solution so that 49.0 mL of the diluted solution contains 4.53g CuCl2 ? Chemistry...Help!! - Dr Russ, Wednesday, December 8, 2010 at 4:43am Molar mass of CuCl2 is 134.5 g mol^-1 so solution needs to contain 4.53 g / ...
December 8, 2010 by Lisa, Help needed!

chemistry
analysis of a mixture of carbonate and bicarbonate: I did an experiment where 2.306g of unknown was diluted with distilled water to 250ml. Then 3 25mL samples of this unknown were titrated with .0663 M HCl and end point volumes were: 41.12mL, 41.00mL and 40.99mL. Then 3 more ...
September 25, 2013 by martini

chemistry
STANDARD: Put into a clean 250 mL volumetric flask exactly ..... 0.90 ml of 1.00 mM iodate STANDARD. Add an excess of 1M KI and 1M Sulfuric Acid and let stand for 5 minutes. Dilute to volume. UNKNOWN: Pipet into a clean 250 mL volumetric flask 1.00 mL of your UNKNOWN and ...
July 28, 2013 by faruk

Chemistry
A reaction mixture of 4.0 mL of 0.002 M SCN- and 5.0 mL of 0.002 M Fe3+ is diluted to 10.0 mL with 0.1 M HNO3 to form the blood-red FeNCS2+ complex. The equilibrium molar concentration of the FeNCS2+ determined from a standardization curve is 1.5x10^-4 mol/L. Calculate, in ...
March 18, 2013 by Anonymous

Chemistry
I have no idea where to even start with this problem on my pre-lab! For part of the experiment, you will need to prepare 100 mL of 0.025 M CH3CO2H, starting from commercial "glacial" acetic acid, which has a concentration of 17.4 M. This is best done by making two dilutions, ...
October 10, 2011 by Jen

Finance
United Technology Corporation (UTC) has $40 million of convertible bonds outstanding (40,000 bonds at $1,000 par value) with a coupon rate of 11 percent. Interest rates are currently 8 percent for bond of equal risk. The bonds have 15 years left to maturity. The bonds may be ...
November 13, 2012 by John

I need answer fast
A machine will add 128 parts of water to l part of the kool aid in the machine. If a kool aid must be dispensed in the ratio 1part kool aid and 448 parts of water, how should the mixture be diluted. Please give me the steps to get to answer. You need to add 448-128 = 320 parts...
August 13, 2005 by babypooh

Chemistry
A sample of 8.44 grams of NaOH is dissolved into 536 mL of aqueous 0.250 M NaOH (assume no volume change). This solution is then poured into 1.96 gallons of water. You may assume that the two volumes can be added.) What is the concentration of NaOH in the final solution? ...
September 3, 2010 by Alex

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

Chemistry- Drbob-help#3
I still need help with #3 I'm not sure how I got 1.14M. I have tried to do the problem over, but I not coming up with my original answer of 1.14M. Somehow I am missing a step. Please show work for the 1.14M Thanks Question#9 reads exactly as written. A student makes a solution...
February 10, 2011 by Paul

Chemistry - more advice needed thanks
I obtained a lot of dirty brown ppt the moment the mixture was poured into AgNO3 solution. Does this mean my NaOH sample contains a lot of chlorides? Could other silver halides be present? However for my control solution of 50ppm sodium chloride solution,a cloudy white ppt was...
September 21, 2010 by candy

Chemistry
Please check my answers. 1. Using the equations, IO3- +5I- + 6H+ -> 3I2 + 3H2O C6H8O6 + I2 -> C6H6O6 + 2I- + 2H+ how many equivalents of IO3- are required to produce enough I2 to oxidize one equivalent of ascorbic acid? Answer: 1IO3- <-> 3I2 <-> 3C6H8O6 1/3 ...
February 27, 2011 by Sara

chemistry
Copper can be determined gravimetrically by precipitation as copper(I)thiocyanate, CuSCN. A wrought aluminum-copper sample(4.5167 g) was dissolved in a minimum amount of concentrated HCl followd by the additon of 25 ml of sulfurous acid to reduced the copper. This solution was...
December 22, 2012 by WILL

Repost-Chemistry -please help
Hi, sorry I missed out something. The titrant used was 0.100M Sodium thoiosulphate.Do I have to consider its concentration in the calculations? Thanks a lot. Posted by angela on Tuesday, August 3, 2010 at 6:58pm. Please help to determine the (%w/w) benzoyl peroxide (C14H20O4) ...
August 3, 2010 by angela

Biology - Help!!
Can someone check these for me? 1. Excretion is the process of (1 point) exchanging carbon dioxide for oxygen. removing metabolic wastes from the body.*** pumping blood throughout the body to supply nutrients and oxygen to cells. breaking food down into nutrients that can be ...
May 20, 2014 by Sandy East Ward

science(chem)
What is Zimmerman Reagent made of? (I know it is acidic b/c I was told after it burned a hole in my jeans) acid? You must mean Zimmermann-Reinhardt reagent (79 g MnSO4, 100 mL of concentrated H2SO4, and 200 mL of concentrated H3PO4, diluted to 1 L) Zimmerman reagent is equal ...
July 16, 2007 by christina

science(chem) Please Please Please check by today
How many ml of 0.8M KOH should be added to 5.02g of 1,5 pentatonic acid (H2A) Mwt= 132.11 to give a pH of 4.4 when diluted to 250ml before the first eq point pKa1= 4.345 Is the answer 25.2ml? If that IS correct then I need help b/c I can't get that answer... I've got it but I ...
July 23, 2007 by christina

fianance
can you check my answers if they are correct thank you 1.) A convertible bond is currently selling for $945. It is convertible into 15 shares of common which presently sell for $57 per share. What is the conversion premium? A. $90 B. $45 C. 57 shares D. 13 shares Answer c 2.) ...
January 5, 2013 by Raj

Psychology
You are to evaluate how well the author used the points described in the text book about conformity and persuasion to explain their reasons for selecting Donnie. In 200 to 300 words. I think Donnie would more likely be persuaded by peer pressures. Although he's the same age as...
July 4, 2008 by Donna

Chemistry 12
9. According to Arrhenius, which of the following groups contain: i)only acids ii)only bases a. NaOH, H2CO3, KCl b. MgCl2, H2SO4, HCl c. HNO3, HCl, H3PO4 d. Mg(OH)2, AgBr, HF e. KOH, NH4OH, Ba(OH)2 10. Enough water is added to 100 g of sodium hydroxide in order to obtain a one...
May 22, 2011 by Kavitha

Unit 4 - Investing
Compare a regular cash dividend with a periodic share repurchase. Which has greater appeal to you? Explain. Explain a stock dividend and further explain if you would perfer it to a cash dividend. What are stock splits and how desirable are they? Please help me understand. ...
August 3, 2006 by candy

Science
Please check my answers (at the bottom) with these questions. 1. An apple quickly changes color when exposed to air. This demonstrates a ________. (1 point) physical property chemical property physical change all of the above 2. When a chunk of dry ice is at room temperature, ...
May 7, 2013 by Annabelle Hartz

chemistry
0.702g of arsenic an oxide of arsenic mass 0.927g how do i calculate the mass of oxygen that combines with 1 mole of arsenic atoms to form the oxide of arsenic. how many moles of oxygen atoms does this mass represent a and then using that answer i have to obtain an empiricl ...
January 31, 2007 by minnie

Science/CHEM
Part 1 Chapt 4 1. You dissolve 157.1 g of ammonium nitrate in a 250 mL volumetric flask and add water to the mark (call this solution A). You take 30 mL of solution A and place it in a 100 mL volumetric flask and add water to the mark (this is solution B). Next you take 50 mL ...
September 28, 2008 by Kelsey

Chemistry
Quick question, since FePO4 is insoluble, will that mean a precipitate will form? During the experiment I don't remember seeing a precipitate. Is that my error, or is the precipitate hard to see? Sure. Adding Na3PO4 will make a big difference. FePO4 is almost completey ...
December 17, 2006 by Karl

Itroduction to finance
Anaswer all questions You have been commissioned to analyse the financial statements of MILOPA LIMITED. Below are the Consolidated statement of financial position and the Statement of Comprehensive Income of the companies. STATEMENTS OF FINANCIAL POSITION as at 31 December ...
November 26, 2012 by ahdab

chemistry
Which of the following pairs of molecules have the same oxidation number for carbon? CO and CO2 CH4 and CCl4 C6H12O6 and C(s) H2CO and COCl2 Carbon always has an oxidation number of +4 What mass of CuSO4.5H2O would you need to prepare 250.0 mL of a 0.250 M solution? [MW of ...
July 3, 2011 by Anonymous

Health
Does anyone know a site where I can find good slang terms for cocaine? I have a project on cocaine due Wednesday and I need to memorize all of the slang terms. Go to google and look up slang drug terms. Take the link for the pride website and go to the section with c for ...
February 19, 2007 by A'isha

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