Titration Definition and 278 Threads

Homework Statement This is the lab I did: http://chemistry.depaul.edu/wwolbach/205_207/11.pdf only steps 1,2, & 3 was performed Homework Equations MV1=MV2The Attempt at a Solution I need help finding the concentration of Ca 2+ and Mg 2+. I already know the basics of it, but I really don't...

Homework Statement A sample of powdered milk weighing 1.450 g was mixed with an aqueous buffer of pH 11.5. A few drops of Calagmite indicator were added and the solution required 31.62 mL of 1.539x10^-2 M EDTA to reach the end-point color change. a. Calculate the concentration of calcium...

Homework Statement A mixture of phosphoric acid and NaH2PO4 are titrated against 0.151 M NaOH. The first equivalence point is at 0.00345 L and the second equiv point is at 0.01288 M. The volume of the total mixture was 60 ml. Calculate the concentration of both the phosphoric acid...

Here's the experiment that I did: http://www.chem.uic.edu/fetzer/chem222/a… from the first page to half of the second page. How do I calculate the amount of KCl and KI in the solution? The graph is suppose to be like a backwards S and it has two endpoints and I don't know how to do the...

Lets say you titrate a weak acid, HA, with a strong base, NaOH. Now, before the equivalence point, the pH is calculated like a buffer because HA + OH- -> A- + H2O. So you have a mixture of a an acid and its conjugate base. My question is, why doesn't this act like a neutralization reaction...

Homework Statement How many molecules of hydrogen peroxide were in the whole bottle? (See Data) Homework Equations Data. Balanced equation. 6H+ + 2Mno4- + 5 h2o2 --> 2Mn2+ + 5O2 + 8 H2O I used 26.85 mL of MnO4- the first trial, and 29.80 mL in the second trial. 10.000 g of H2O2 used in the...

I'm having an issue solving a back titration problem. We need to identify the metal in a metal carbonate. It can either be a group 1A or 2A 1.8500 grams of the carbonate are diluted to .2500L and then 0.02000L is taken and mixed with 0.01500L of 0.1789M HCl in a flask. After shaking the...

Homework Statement Lets say we titrate an amino acid with a strong base (NaOH), like I know that the hydrogen of the carboxyl (COOH) group will be pulled away followed by the amino group (NH3+), but is there a particular reason why the hydrogen on the carboxyl group is pulled out first rather...

Homework Statement The problem is that i am trying to find out the concentration of phosphoric acid in cola. I have completed the titration of 3 different types of cola. I have obtained the pH and volume on the titration graph. Note: I am trying to figure out the overall concentration of H3P04...

Hey :) Im helping somebody out with a titration she is doing in her chemistry class. The aim is to determine the citric acid content in a soft drink (probably Sprite or 7up). Based on some reading I've done, it seems like a pretty straightforward process, however there is something i'd...

To determine the concentration of Fe (aq)2+ by a redox titration, we could use an acidified standard solution of A. Sn2+ B. Pb2+ C. HCl D. H2O2 I know the answers H2O2, but i don't know how to get it. How doe redox titrations work?

Homework Statement Supposed to rank a bunch of titrations in order of pH; Here is one of the many... 200.0 mL of 0.100 M (C2H5)2NH (Kb = 1.3 x 10-3) by 0.100 M HCl Homework Equations Henderson–Hasselbalch equation? The Attempt at a Solution I don't even know where to start, I'm...

Ok i got to answer i series of 8 questions, most of them i think rely of the question before it to complete the others.Heres what I am given: A student was trying to determine the concentration of an ammonium chloride solution. he made up a solution of barium hydroxide by dissolving 52.947g...

Homework Statement A mass of iron ore weighing 0.2792g was dissolved in dilute acid and all the iron was converted to Fe2+(aq). The iron II solution required 23.30ml of 0.0194M KMnO4 for titration. Calculate the percentage of iron in the ore.Homework Equations Wrote out my redox reactions...

A 25.0 ml sample of 0.150 M HNO2 is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of HNO2 is 4.50x10-4 What I can't get is the fact I don't know how much has already been titrated at the equivalence point. So it's difficult to know the total volume...

Homework Statement A student titrated 10.00-mL aliquots of her unknown amino acid solution with standard 0.1521M NaOH (18.61mL) and with 0.0986M HCl (3.28mL). Calculate the concentration of the amino acid. Assume the amino acid contains both the A & A- forms of the amino acid. Homework...

Homework Statement Hi, A titration revealed I have .23M acetic acid (HC2H3O2) in a 10.0mL soln. I was not asked the weigh the sample at any time but our question is: "The manufacturer of this vinegar claims it is 5% by weight. Ue your results and a density of 1.0g/mL to investigate this...

Homework Statement Give the net ionic equation for this reaction: Fe(NH4)2(SO4)2.6H2O + KMnO4 Homework Equations Reducing reaction is 4H+ + MnO4- + 3e ---> MnO2 + 2H2O Oxidation 3Fe+2 ---> 3Fe+3 + 3e The Attempt at a Solution 4H+ + MnO4- + 3Fe+2 ---> MnO2 + 2H2O +...

http://img19.imageshack.us/img19/2692/chptitration.jpg http://img130.imageshack.us/img130/6351/titrationfigure1.jpg 1.)For the titration of strong acid and strong base, and at the beginning of the curve, how to explain the big amount of base added only increase a little of the pH value...

Homework Statement The problem is as follows: 100.0 ml of 0.100 M acetic acid is placed in a flask and is titrated with 0.100 M sodium hydroxide . An appropriate indicator is used. Ka for acetic acid is 1.7 x 10 -5. Calculate the pH in the flask at the following points in the titration. a...

Homework Statement 100.0 ml of 0.100 M acetic acid is placed in a flask and is titrated with 0.100 M sodium hydroxide . An appropriate indicator is used. Ka for acetic acid is 1.7 x 10 -5Calculate the pH in the flask at the following points in the titration. a. when no NaOH has been added...

1. COnsider the titration of 80.0 mL of 0.100 M Sr(OH)2 by 0.400 M HCl. Calculate the pH of the resulting solution after the following volumes of HCl have been added. a. 0.0 mL b. 20 mL c.80 mL Homework Equations Henderson–Hasselbalch equation or direct -log The Attempt at a Solution a) before...

Homework Statement If you started at the basic end-point and titrated acetate solution to the acid end point, how much acid would be required? Our acetate solution was: 1 mL of 0.1 M acetic acid 1 mL of 0.1 M acetate 8 mL of water total volume: 10 mL Titration with 0.1 M HCl...

If you were given a sample unknown solid acid that had a mass of 0.7 g and it was being dissolved in 50 mL of water and was being titrated with NaOH, is it possible to find the molar mass or the formula of the acid? Given information Mass of solid acid: 0.7 g Volume of acid solution: 50 mL...

Homework Statement Hi, So I have this lab in which we had to titrate HCl with NaOH (of an unknown molarity) So here's the lab.. I decided to scan it because I'm not a good explainer at all, heh. The molarity of the HCl is 0.15M by the way What I was wondering is how to...

Homework Statement Well we have this lab on equilibrium using titration. I found the lab here http://wikieducator.org/Chemistry/Equilibrium_Titration" So I'm kinda stuck on number 3c, where it asks what is the starting concentration of Fe3+. I don't know if I did number 3b right...

Titration question 2! equivalence points. Am i right? Homework Statement this is the originial question. A 0.149 g sample of a weak acid (HA) requires 16.80 mL of 0.110 M NaOH to completely reach the equivalence point. What is the Molar Mass of the acid? and i got 86.63 g/mol. I have...

Homework Statement A 0.149 g sample of a weak acid (HA) requires 16.80 mL of 0.110 M NaOH to completely reach the equivalence point. What is the Molar Mass of the acid? Homework Equations ... The Attempt at a Solution i don't think i did it right. i just did 0.0168Lx0.110M=...

Homework Statement 10 mL of a solution of formic acid HCOOH required 31.23 mL of .1034 M NaOH to titrate it. Find the pH at the endpoint. Answer is 8.32. Homework Equations pH=pKa + log[A-]/[HA] The Attempt at a Solution initial concentration of HCOOH is .3229 M from fact .1034...

Homework Statement Consider a titration in which 50.00 mL of .450 M benzoic acid, C6H5COOH, is reacted with 0.2000 M Ca(OH)2. What will the pH be when 60.00 mL of Ca(OH)2 has been added?Homework Equations 2C6H5COOH + Ca(OH)2 -> 2 H2O + Ca(C6H5COO)2The Attempt at a Solution I have determined...

ok i am doing my lab report ow, and i am compeltely lost with some of these questions. it was a titration neutralization lab can get some help? 1- why is it necessary to dissolve the khp in water? 2- why is necessary to swirl the flask during the titration? i think the second one is so...

Homework Statement Trimethylamine has a Kb of 6.3 x 10-5. How many liters of HCl gas, measured at 1.20 bar and 298 K, must be added to 250.0 mL of 0.500 M trimethylamine to give a pH of 10.30? Homework Equations The Attempt at a Solution I don't know where to start because I don't know how...

Hello all, We did a titration lab today. We used Ca(OH)2 in a burret and titrated a 10mL solution of vinegar. The solution of Vinegar was mixed with water, in a 1:20 ratio(inside a flask). So for every 10mL of solution there was 0.5mL of pure vinegar. We used phenothalen as the indicator...

A 10.00 mL solution of 0.2500 M CH3COONa is titrated with 0.1300 M HCl to the equivalence point. CH3COO− + H+ → CH3COOH volume of HCl required=19.23 mL Calculate the pH of the solution at the equivalence point. I've tried this a million ways and still keep getting it wrong. Also, my...

iron(ii) can be determined by redox titration with a cerium (iv) solution. the oxidation reduced reaction is fe2+ + ce2+ = fe3+ + ce3+ what is the concentration of fe2+ if it requires 21.35mL of .3136 ce4+ to titrate a 10.00mL aliquot to the endpoint.

During my lab experiment, i am required to titrate acetic acid with sodium hydroxide and i am required to calculate the pKa from the titration curve. I want to ask why is pH=pKa + log(salt/acid) (the pH value is the midpoint of the neutralisation and salt/acid is the concentration of salt over...

Homework Statement A solution of histidine has all acid-base groups protonated. The pKa of the carboxy group is 1.8, the amino group is 9.2, and the side chain is 6.0. For each mole of amino acid, 2.5 moles of NaOH are added. What is the pH of the solution? Homework Equations...

A titration in which 0.01 mol L NaOH is added to 10ml of ethanoic acid is carried out. find the pH at the equvilence point

Homework Statement "Calculate the grams of acetic acid per liter of vinegar" Homework Equations Previous problem stated the multiply the average molarity of diluted vinegar times 10= 2.7 M Vinegar (acetic acid)= H(C2H3O2) molecular weight= 60.06 g The Attempt at a Solution...

In my work we are suffering now from a problem of magnesium in water that we are using for drilling, we need test kit to test magnesium oncentration we could not use photometric analysis or any other complicated device we need method of testing depend on titration reaction could anyone help me

Homework Statement 2.0g of pure undiluted HsSO4 is cautiously added to water and the solution diluted to 500 cm3. What volume of 0.1M potassium hydroxide, KOH, would exactly neutralise 25cm3 of the acid solution? Homework Equations concentration = number of moles/volume mass in grams =...

Homework Statement Why would methanol be a better solvent for ASA compared to ether or chloroform, when NaOH is used for titration? I think I have an idea why: NaOH is only soluble in polar solvents. Methanol is polar, while ether and chloroform are not. . . . Does this have anything to do...

These questions relate to the secondary coulometric titration of vitamin C. In this titration an applied voltage is used to generate a current that oxidizes Iodide to iodine. Iodine then oxidizes vitamin C. A starch indicator detects excess iodine via the formation of I3- My questions are...

Homework Statement Consider the titration of 20.0mL of a 0.100 M solution of HBrO, a weak acid (Ka=2.5x10-9) with 0.200 M KOH. Calculate the pH of the following volumes of KOH. a. 0.00mL b. 5.00mL c. 10.00mL d. 30.00mL Homework Equations pH=pKa +log [base]/[acid] The Attempt...

I have a chemical practical coming up in a few weeks time and need help sussing out some questions. I know that the practical will be on redox titration between h2o2 and KMnO4, I wanted to know how I could determing the concentration of h2o2. Could someone run through a specimen calculation...

If a 2.893 g sample of an unknown containing iron requires 28.45 mL of the permanganate solution described in Pre-Laboratory question 3 to reach the endpoint what is the % Fe in the unknown?

Homework Statement You are provided with a solution of hydrogen peroxide which is known to be approximately ‘100-volume’. Plan two experiments that would enable you to determine the exact concentration of H2O2 in mol dm-3, in this solution. One of your experiments should involve a redox...

Homework Statement Bleaching powder, Ca(OCl)Cl, reacts with iodide in acidic medium according to the equation: OCl– + 2 I– + 2 H3O– ---> I2 + Cl– + 3 H2O How many millilitres of 0.0645 M Na2S2O3 are required to titrate the iodine liberated from a 0.6028 g sample of bleaching powder...

Please Help! Back titration! Find the mass of ammonium sulfate in lawn fertiliser. The experiment in a nutshell: A sample of 1.301g lawn fertiliser is dissolved in de-ionised water and diluted to 250mL. A 20mL aliquot is taken and an excess of 0.1M NaOH is added. The remaining NaOH is...

A typical protein contains 16.2% nitrogen (14.00674 mg/mmol). A 0.500 mL aliquote of protein solution was digested, and the liberated NH3 was distilled into 10.00mL of 0.02140 M HCL. The unreacted HCl required 3.26mL of 0.0198 M NaOH for complete titration. Find the concentration of protein (mg...