Titration (also known as titrimetry and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the titrant or titrator, is prepared as a standard solution of known concentration and volume. The titrant reacts with a solution of analyte (which may also be termed the titrand) to determine the analyte's concentration. The volume of titrant that reacted with the analyte is termed the titration volume.
Homework Statement
A solution of household vinegar (a mixture of acetic acid and water) is to be analyzed. A pipet is used to measure out 10.0 mL of the vinegar, which is placed in a 250 mL volumetricflask. Distilled water is added until the total volume of solution is 250 mL. A 25.0 nL...
this is from a lab. i titrated NaOH into 2 grams of an unknown acid with NaOH
the equivalence point was at 38.25ml
so using 2 grams of an unknown acid and 38.25ml NaOH i have to find molecular mass of the acid.
i tried adding 2 to 38.25, but i don't think that is right.
Homework Statement
suppose a small amount lead (II) chloride got into your Ba(OH)2 sample before titration, contaminating it. how do you think the contamination would affect your calculated concentration for the sample? what about a small amount of FeCl3?
Homework Equations
The...
Homework Statement
A sample of solid monoprotic acid with a molar mass equal to 179.4 g/mol was titrated with 0.1608 M sodium hydroxide solution. Calculate the mass in grams of acid to be used if the volume of NaOH to be used is 25 mL.
The Attempt at a Solution
Since the acid is...
I have an error analysis question...I carried out a titration, and I have error for each measurement, but I then took the second derivative of the data and graphed it. The actual value I am reporting was estimated from the x-intercept of this graph. The curve was not fit to anything. How do I...
hi
The following question I am stuck on:
Some automatic titrators used in modern analytical laboratories measure the electrical conductivity of the solution in the flask as the titration proceeds. The equivalence point is determined by monitoring changes in the conductivity of the solution...
Hi All
I have a question that I require an answer to. For the above titration, concentration of A-(conjugate base of acid) is the same as concentration of HA at half equivalence. It is at this point that pka=ph of the solution. I agree to this conclusion, but why is the concentration of A-...
Homework Statement
25.00 Ml sample of a solution of Al_2(SO4)3 and NiSO4 was diluted to 500.0 mL and the Al^3+ and Ni^2+ in a 25.00 mL aliquat were complexed by addition of 40.00 mL of 0.01175 M EDTA in a pH 4.8 buffer.
The excess EDTA was then back titrated with 10.07 mL of 0.00993 M...
Homework Statement
Assuming the acid (pain killer) is monoprotic, calculate the moles of pain killer/hydrogen ion in a sample of an unknown pain killer using a titration:
NaOH was added to a pain killer solution
m[pain killer]=0.40g dissolved in 50 mL of distilled water
[NaOH]= 0.15...
Homework Statement
Estimate the volume of acid rain in L that can be neutralized by 1.00 g of limestone. Assume the pH of rainwater collected in your rain gauge is a representative value for acid rain. Assume that acid rain contains sulfuric acid as the source of hydrogen ions. The molecular...
Homework Statement
Titrating .1006M CH3COOH with .2012M NaOH. pKa=4.74, Ka=1.8*10^-5
What is the pH at the equivalence point of the titration?
Homework Equations
pKa = -log(Ka) pH = -log[H+]
The Attempt at a Solution
Alright, after setting up an ICE table (in order to find...
[SOLVED] Redox titration help
Hi
In class we are doing a redox titration with a diluted bleach solution. We made the aliquot with 5 ml of 10% KI solution and 5ml H2SO4 with 25 ml of the diluted bleach solution. And the burrette solution was sodium thiosulfate @ 0.1 mol L-1. my results were as...
Homework Statement
A sol;n of 14.05 mL of NaOH is mixed with 50.0 mL of 0.2102 M H2SO4 (standardized) and allowed to react. The sol'n (H2SO4 and NaOH) is still acidic, so it is titrated with 10.55mL of standardized KOH (0.08883M) until the equilivance point is reached. What was the...
determine the % of iron II and iron III in a mixture containing both, where i am given 200cm3 of a solution containing 1.3g of iron ions(Fe 2+ Fe 3+) using potassium magnanete.
I wrote down the equation already, and method, but i don't know how to work out the % from it :/
Can you please help...
Homework Statement
Need a little help on a lab. I have all the data for a titration of a weak acid with NaOH which includes the pH of the acid for however many mL of NaOH added. I've plotted a pH vs V NaOH added graph. From that, I plotted a ∆pH/∆V vs V NaOH added graph. From this, I found...
Firstly his is my first post on this forum so hello.
Okay, well i encountered a major problem while doing my titration 2 days ago and I am unsure of why.
the titration was to find out the concentration of sulphuric acid in a sample of "acid rain" (i recon it was just sulphuric acid...
EDTA titration?!URGENT NEED HELP
we did a lab in school to determine water hardness by EDTA titration. I did three trials , first one require 38mL , 2nd - 50 and third-42 the question was to averge the volumes of EDTA used in the last two titrations and to calculate the moles of EDTA required...
Hi guys,
I have been out of school for a couple of years and I forgot when is it OK to consider a curve crossing at certain value. Let me explain.
I am measuring signal in a titration experiment. The outcome is a typical saturation curve (growth curve), a hyperbola.
I am wondering if it is...
I have a solution which contains unknown amount of dissolved ferric chloride (FeCl3) and hydrochloric acid.
Can I use the titration method with NaOH to determine the concentration of HCl?
I was concerned since dissolved FeCl3 is also acidic, and the fact that NaOH will try to neutralize it...
Homework Statement
We did a lab in class about weak acid/strong base titration, but I'm having a bit of trouble. We we only given the molarities of an unknown weak acid and a strong base (NaOH) and the pH of six different mixtures containing different mL of the two, which is below:
Test...
This was a pretty long double titration problem, I solved it all except for the last part & could use a bit of help because I'm stuck.
Part 1 A 100.00 ml solution containing aqueous HCl & HBr was titrated with .1200 M NaOH. The volume of base required to neutralize the acid was 47.14 mL. a)...
I am performing a REDOX titration of a diluted bleach sample in my analytical chemistry class. I am using sodium thiosulfate as the titrant to determine the amount of sodium hypochlorite ion in solution. I am using a starch indicator, which is supposed to turn from blue to colorless at the...
We recently did an experiment in chem lab with titrations and we are supposed to find out the molarities of some unknown solutions. I thought that I was doing my calculations right, but the checking program that I am using keeps telling me that I am wrong.
We made a standard solution that was...
My question is:
Using the average [EDTA], find the weight% of Ca2+ in the unknown
My attempt:
so, the[EDTA] i found from standardizing was 0.005 M;
I used 29.85mL to of EDTA to titrate my 25.00mL unknown
and the weight of my unknown used was 0.2505 g
this is what i did:
[EDTA] =...
Homework Statement
A 0.307g sample of an unknown triprotic acid is titrated to its equivilence point using 35.2ml of 0.106 M NaOH. Calculate the molar mass of the acid. Answer is in g/mole.
Homework Equations
The Attempt at a Solution
I just don't know where to start with this...
25 mL of 0.1 M HOAc are titrated with 0.15 M NaOH. What is the pH at
equivalence?
I know that the pH at start will be greater than 1.0 and the pH at equivalence will be greater than 7 since its a titration of a weak acid and a strong base. But what I don't know is whether or not there is a...
Homework Statement
A 10.02 mL solution of chemical A4+ is determined by precipitation titration with 40.07 mL of 0.03015 M titrant B3-. The reaction stoichiometry is given by
3A4+ + 4B3- => A3B4 (s)
For a log Ksp of -36.6, what is pB3- at the equivalence point?
You must express your...
A 1.00-g solid sample containing a mixture of table salt (NaCl) and citric acid (H3C6H5O7, a triprotic acid) is dissolved in 15 mL of water.
Titration of the acid solution requires 40.00 mL of 0.2003 M NaOH solution to reach the endpoint.
Calculate the mass percent H3C6H5O7 in the solid...
I did a titration lab to find out the weight percent of CO3^2- in an unknown sample which contains only NaCL and CaCO3^2-.
My results were about 29% for the first titration and 18% for the second titration; I was wondering the types of error that led to this ~10% difference.
Some of the...
Hi. In class, i am required to perform a titration where i am given a solution of sodium carbonate and a solution of hydrochloric acid of known concentration. I am to use the acid to calculate the percentage purity of the sodium carbonate.
Im not really sure how to go about doing this. The...
[SOLVED] Finding percentage of carbonate in mixed sample titration
A sample of mixed carbonates, SrCO3 (147.63 g/mol) and Li2CO3 (73.89 g/mol), weighed 0.5310 grams. If this sample is titrated with acid, it is found that 29.47 mL of 0.3400 M HCl are required to reach the endpoint. What is the...
Homework Statement
Using isothermal titration calorimetry, you calculate \DeltaH^{o}_{bind} (= -5000 cal/mol) for a protein-ligand binding reaction at 25°C. You then perform a separate assay in which you measure equilibrium ligand binding at two different temperatures:
L_{0} (nM)...
This is a topic that I simply know very little about. The question is asking me to determine the pKa value from the titration curves that I graphed in a recent experiment. Although I know the "buffer region," I have no idea how to determine the pKa. The weak base was 1M, 0.75M, 0.50M, and...
Homework Statement
A 0.2600-g sample of impure Ca(OH)2 is dissolved in enough water to make 45.70 mL of solution. 20.00 mL of the resulting solution is then titrated with 0.2455-M HCl. What is the percent purity of the calcium hydroxide if the titration requires 9.88 mL of the acid to reach...
Homework Statement
A solution contains 1.694mg of CoSO4 (155.0 g/mol) per mL. Calculate the volume of 0.08640 M EDTA needed to titrate a 25 mL aliquot of this solution.
Homework Equations
Not really sure, the book is no help but this may help:
K(CoSO4) = [CoSO4] / ([CO2+] [SO42-])...
Titrant
[HNO2]= 0.10 mol/dm3
v= 25ml = 0.025 dm3
+
Analyte
[NaOH]= 0.125 mol/dm3
v= 20ml = 0.02 dm3
Question is: What is the ph after adding a volume 10ml of titrant?
I know the answer is ph= 4,3
I'm not allowed to use Henderson Hasselbach equation.
This is the...
Homework Statement
when a carbonate acts as a base and neutralises an acid, CO2 is formed. the problem is that some of the CO2 dissolves in the water and forms Carbonic Acid.the Carbonic acid will affect the titre value as it will react with the base, along with the HCl. How do we prevent...
Homework Statement
I am planning a titration to determine the concentration of commercial 20 volume hydrogen peroxide. I will be titrating it against potassium permanganate. I know that acid, H2SO4, must come into it too, but am unsure as to whether this is added to the H2O2 solution, or the...
Barium hydroxide forms several hydrates. A specimen of barium hydroxide, suspected of being a hydrate, was prepared and analyzed as follows to determine its formula.
3.632 g of the compound was dissolved in water to give 250.0mL of solution. 25.00 mL of this solution was titrated with 0.0987...
"A student was given a .1 M solution of an unknown diprotic acid, H2A, and asked to determine the Ka1 and Ka2 values. The student titrated 50.0 mL of the .1 M H2A with .1 M NaOH. After 25mL of NaOH was added, the pH of the resulting solution was 6.7. After 50 mL of NaOH was added, the pH of...
Currently in chemistry, we are doing titrations and buffers for acid base equilibrium. I've noticed that titration curves have the distinct characteristics of sigmoid curves. So, can titration curves be modeled with a sigmoid function?
Homework Statement
Some brands of household bleach contain sodium hypochlorite, NaOCl as the active ingredient. The concentration of NaOCl in the preparation is recorded as the concentration of ‘available chlorine’. One brand of this bleach stated on the label that it contained ‘4%(w/v)...
Homework Statement
Cointreau is a French liqueur sometimes used to enhance the flavour of strawberry desserts. Its label states that the concentration of the alcohol is 40%alc/v. To test this claim, a 5.00ml sample of the liqueur was pipetted into a 100ml standard flask and the volume was made...
Is a pipette used to transport the aqeous reactant to the flask.
Is a burette used to transport the titrant in the flask.
So a pipette is smaller than a burette? What other differences between the two. Is flask, pipette and burette the key instruments in titration?
Hi all,
i am hoping to make sodium bisulphite by passing so2 through NaOH.
However, i was wondering if anyone has a link or a method to a titration for calaulating % sodium bisulphite,
Regards,
Someone likened cooking with titration. How accurate is this?
Is heat usually applied to titration? Does titration recquire physical labour to stir the solution? If not than these are two big differences between cooking and titration.
What other chemical methods/techniques are comparable to...
Homework Statement
The acidic waste from a student's experiment needs to be disposed of, but pouring it down the sink would increase the impact of acid rain on the local water supply. Explain how you could determine the amount of limestone needed to neutralize the environmental impact of the...
omg Chem Titration help fast!
Ok so I'm a gr11 student who just had a titration exeriment.. and there are a couple of things that are really screwing me over!
Okay so we used an indicator, Phenolphthalein, more specifically, and when we stopped the titration when it turned light pink.
My...
Okay, so I was browsing through an AP chemistry book because I really want to major in either chemistry of physics and want to take advantage over thanksgiving break to get ahead on chemistry because I really love it ^^. So I was wondering if someone could check my work on this problem. Thanks...